DO THE TON

Blood Sweat Tears and Grease => Projects => Specials => Topic started by: Brodie on Jul 30, 2015, 01:26:17

Title: Brodie's Bastard BSA
Post by: Brodie on Jul 30, 2015, 01:26:17
Ok, so I decided to start this thread as a running ideas area that will evolve into a build thread. So here we go...

I have a BSA A10 frame from what I think is 1958. I have always liked the style of the old BSA bikes but could never afford one. So instead I decided to build my own from a lot of different bikes.
The motor I plan to use is a '72 XS2 motor and it has been far from maintained. I was an old sidecar motor that had been sitting in the hack for 21 years before I bought it. So of course a full rebuild is in order.
I had originally planned to use a new triumph 900 motor but that went out the window quick once I started to look around for them. So the next best choice was the XS, there are plenty of after market parts for them and I thought I could easily turn mine to a 750. Boy was I wrong. Turns out I have a 306 motor, right before they changed to the 447 which most aftermarket parts are made for. Only difference that concerns me is the rod length. So I am thinking of getting 447 rods fitted to the crank when I have the rebuild and rephased.

As for the forks. I have a GS750 that I have been working on, I was never completely sold on it being the bike I wanted to build, but I kept at it anyway. Lesson learnt now though. Lucky for me I have some nice powercoated Boranni Rims and a rebuilt set of forks to fit to my YamBSA. (Yambeezer)The spacing between the GS and BSA are not to different so I can just take a few mill away from the axle spacers and rotor spacers and be good to go. Of course I ran into trouble again, The BSA forks are tapered at the top going from 31mm on the lower side of the triple to 29mm on the top.

So where I am at is looking into having a custom top yoke made from 6061 and scratching my head at the amount of money I need to spend on the motor.

Anyway here are some pictures in no particular order.

(https://lh3.googleusercontent.com/tf3ArJmvEXWteFcP6QPHJmT0_8t3O8GeW-qu667gt_A=w798-h644-no)
Top Tree Design V1

(http://www.dotheton.com/forum/index.php?action=dlattach;topic=15707.0;attach=142734;image)
The Frame after a quick paint
(http://images.tapatalk-cdn.com/15/07/29/48d45785088267cb37bfa4a2f9365f5a.jpg)
Lovely 20 year build up of crust.
(http://images.tapatalk-cdn.com/15/07/29/67eceec96365da2728e469eea045aeec.jpg)
(http://images.tapatalk-cdn.com/15/07/29/875e7d52b010aaa1d181aaafea9dd5cf.jpg)
Rockers and cam seem ok
(http://images.tapatalk-cdn.com/15/07/29/98de2a55d9b8a50cdc11623422b35c23.jpg)
And its on fire...
Title: Re: Brodie's Bastard BSA
Post by: Brodie on Jul 30, 2015, 01:27:59
Ok so with the engine I am looking at:

HHB Rephased Crank and Cam
447 Rods
MikesXS 750 kit
HHB PMA kit
Pamco 277 Ignition
XS Performance Mikunis
Stainless Valves
XS Performance Valve Springs

And a full bearing and seal kit.

All that will drain my wallet real quick.

For the rear shocks it comes down to cash. I have been watching a set of Marzocchi Strada shocks on ebay that are the right length and I am thinking this might be the go.
On the other hand If cash allows I would love a set of Ram Shox for this build.

The wheels will come off my GS and will have dual front rotors with dual pot calipers, the rear will be disk as well.

As for the tank I cannot decide between the standard A10 RGS tank or getting an A65 Spitfire tank.
Title: Re: Brodie's Bastard BSA
Post by: Brodie on Oct 08, 2015, 23:08:14
ANNNDDD, I sold the engine.

Had a thought about how much I would be spending, thought about how I would be messing up a rare motor (XS2) and thought about why I wouldn't just spend that cash on a Triumph or BSA pre-unit.

So the historical club swap meet is in a few weeks. See what I come back with.

Ohh and I also managed to get the go ahead from my missus to build this one?!? Seems like the "But we can enter it in classic shows!" card seems to have worked. Although now there is talk of a sidecar?! Not on this one me thinks.
Title: Re: Brodie's Bastard BSA
Post by: Brodie on Oct 17, 2015, 00:39:12
(http://images.tapatalk-cdn.com/15/10/16/2889a2d77650bc1b76314ba69888dc7c.jpg)

Lovely looking roller. See if I can get some parts to fill it out at the swap meet next weekend.
Title: Re: Brodie's Bastard BSA
Post by: Hurco550 on Oct 17, 2015, 08:30:43
Looks good man =) keep an eye on that top triple. Sharp inside corners like the ones on your "clamp lugs" can start to Crack easily due to focused stress. That's why they usually have a radius. I'm not saying I'm an engineer or anything lol this is gonna be a sweet ride and I'm looking forward to following along =)
Title: Re: Brodie's Bastard BSA
Post by: goldy on Oct 17, 2015, 09:33:50
An interesting project for sure! Looking good so far...good solid frame too. Keep us posted!
Title: Re: Brodie's Bastard BSA
Post by: Brodie on Oct 24, 2015, 02:32:43
Speaking of petrol tanks... I managed to pick up this beauty at a swap meet for cheap!

(http://images.tapatalk-cdn.com/15/10/23/9b296c8e1da281118cf507f6ba275cad.jpg)

Also got an oil tank while I was there. Didn't manage to find a tool box though.

As for the risers. I have a custom cut top yoke and have not drilled any holes for them yet. Wanted to figure out the tank and bars before hand
Title: Re: Brodie's Bastard BSA
Post by: Hurco550 on Oct 27, 2015, 21:43:26
that's a beaut man =) nice score on that tank!
Title: Re: Brodie's Bastard BSA
Post by: xb33bsa on Oct 31, 2015, 10:46:09
cool beezer brozie ,see what i did there ?  :D
i have lots of shocks waiting to be rebuilt i could fix you up with some vintage fox gas shox, works perf gas trackers or even a nice pair of 'zoch strada in 13.25"
unfortunately the goddam shipping keeps going up and it's $65 american to ship shocks to you down dare now  :'(
Title: Re: Brodie's Bastard BSA
Post by: Brodie on Oct 31, 2015, 15:06:58
Hmm I will keep that in mind mate. I would love a pair set up for me. Everything is bloody costly to get shipped here. It is half the reason us Aussie take so long to build stuff.

And neoprene sounds like a good idea. Still working out what has been lopped off the frame and what has been added.

One question I do have is about the front tank mounts. There appears to be nothing for them to connect to on my frame.

Still need to decide on the colour of the bike. Surprisingly when my grandfather visited the other day he noted how nice the golden flash looked.

I hadn't even told him I was building a BSA.
Title: Re: Brodie's Bastard BSA
Post by: Tune-A-Fishİ on Oct 31, 2015, 16:36:21

One question I do have is about the front tank mounts. There appears to be nothing for them to connect to on my frame.


I hadn't even told him I was building a BSA.

The two blue arrows to brackets... One is for tank mount, do you have indents under the tank for rubber cushions? if so you may need a bracket that mounts to one of those frame brackets. The red is for the tank bolt under the rubber plug with BSA on it.
Title: Re: Brodie's Bastard BSA
Post by: Green199 on Oct 31, 2015, 17:54:05
That tank does look nice, good shape and good colour.

Whats the condition on the paintwork like. If good, I say keep it!  ;D
Title: Re: Brodie's Bastard BSA
Post by: unclerob on Nov 02, 2015, 20:00:18
Hi Brodie, good to see it coming on! Your question about tank mounts.....the only mount on an A10 tank is the centre bolt and the 2 holes in your top frame tubes aren't stock, the 2 threads on the bottom of the tank near the front are just for a steel strap that is there to strengthen it. Also a pair of rubber bungs go in the lower hole of that bit hanging down.....
Have you ever been to this site? Its easy the best for anything A10....
http://www.a7a10.net/forum/index.php
Title: Re: Brodie's Bastard BSA
Post by: Brodie on Nov 20, 2015, 18:55:57
Thanks for the help guys.

The paint on the tank needs to be re done. It looks as if someone took a RGS tank and painted it for a golden flash. Has some pitting where the chrome would have been.

As for the mounting I have that sorted now thanks to your help. Just need to get the oil tank and tool box sorted.

Ohh yeah, I bought a tool box. Not a repop either.
(http://images.tapatalk-cdn.com/15/11/20/eea81d2ee4c1dc6ab177b5b22b0ff50b.jpg)
Title: Re: Brodie's Bastard BSA
Post by: Brodie on Dec 19, 2015, 06:38:20
(http://images.tapatalk-cdn.com/15/12/19/45b1b196aacd1fc7d1d5f39a95bed640.jpg)
Title: Re: Brodie's Bastard BSA
Post by: goldy on Dec 19, 2015, 09:11:38
So...comming along nicely! You going to use the M20 engine?
Title: Re: Brodie's Bastard BSA
Post by: Brodie on Dec 19, 2015, 09:15:01
I have an odd plan, that is a M21 complete bottom end and M20 cylinder.

I plan to convert it to a OHV engine. I have only seen 3 examples of what I want to attempt. Need a Shovelhead top end to pull it off.

Currently I am thinking the M21 stroke may be too long.
Title: Re: Brodie's Bastard BSA
Post by: Tune-A-Fishİ on Dec 19, 2015, 09:17:17
I have an odd plan, that is a M21 complete bottom end and M20 cylinder.

I plan to convert it to a OHV engine. I have only seen 3 examples of what I want to attempt. Need a Shovelhead top end to pull it off.

Currently I am thinking the M21 stroke may be too long.

What a fun project Brodie! isit for you? What do you ride now?
Title: Re: Brodie's Bastard BSA
Post by: Brodie on Dec 19, 2015, 09:24:17
Yep, bike is for me. Hence so many chops and changes to ideas.

Currently riding a SR250 that a friend is paying me for ever so slowly. Has been a bloody good bike as well. Don't think it will be out of my fleet any time soon though.

Here is the bike that inspired me to build a single OHV.
(http://farm8.staticflickr.com/7379/12203095023_6d70b0c9cd_o.jpg)
Title: Re: Brodie's Bastard BSA
Post by: Tune-A-Fishİ on Dec 19, 2015, 10:02:25
Very nice, the shovel top looks factory on there. Can you get hold of the builder and pick his brain some?
Title: Re: Brodie's Bastard BSA
Post by: goldy on Dec 19, 2015, 15:03:16
Very, very interesting! I've a feeling that this is going to be a really impressive and unique machine.
Title: Re: Brodie's Bastard BSA
Post by: Brodie on Dec 19, 2015, 18:57:05
I have found another two examples, but each with no information.
(http://farm8.staticflickr.com/7379/12203095023_6d70b0c9cd_o.jpg)
(http://farm8.staticflickr.com/7405/12203092663_2ec9546bbd_o.jpg)

All the info I can find is they used a shovelhead top end, most likely big twin, and a M20 lower.

My M21 lower might need a stroker cylinder.
Should be about 691cc, no idea on CR.
Title: Re: Brodie's Bastard BSA
Post by: Tune-A-Fishİ on Dec 19, 2015, 19:18:28
Good mornin sunshine

You need to do it with a iron head and blaze a new trail hoooha


Sent from my iPhone using Tapatalk
Title: Re: Brodie's Bastard BSA
Post by: Rider52 on Dec 19, 2015, 19:51:02
Horst Heller in Germany either built one or knows a lot about those hybrid motors. He's a member of the Jockey Journal
www.jockeyjournal.com
Great project!!!! I'm a big fan of BSA A7/10 frames. I built a 45 hybrid in the 90s. I still have a frame I got from Jack Wilson at Big D Cycle in Dallas.

Rider
Title: Re: Brodie's Bastard BSA
Post by: xb33bsa on Dec 19, 2015, 21:15:20
thats fuckin awesome and funny my bsa goldstar came with a harley piston innit ,but i had never heard of the whole top end
i had to take the brand new harley piston out of mine tho it woont start  :-X :D
its a wonder the bsa rod and crank can handle all the gobs of power a harley pissed-on puts out dontcha know ?!
Title: Re: Brodie's Bastard BSA
Post by: Brodie on Jan 12, 2016, 21:32:14
Just a quick update.

(http://images.tapatalk-cdn.com/16/01/12/3c9fb2c45328e4b9ce0cdc24f418a7ba.jpg)

Also the shovelhead is so close(http://images.tapatalk-cdn.com/16/01/12/5d3fc83076bc3676629bf0a45e1768e9.jpg)

Ironhead is a mile off
(http://images.tapatalk-cdn.com/16/01/12/17c60c701be099012bce0cb8ade1e2bb.jpg)

Thanks to Hurco for the base gasket idea.
Title: Re: Brodie's Bastard BSA
Post by: canyoncarver on Jan 12, 2016, 21:36:48
Wow, I've never seen one like your inspiration pics.  Looks very very cool.
Title: Re: Brodie's Bastard BSA
Post by: Hurco550 on Jan 12, 2016, 21:45:45
Shovel is pretty close. Could maybe slot the mounting holes to fit it? Bummer you can't get ahold of the guys who did your inspiration pic bikes
Title: Re: Brodie's Bastard BSA
Post by: Brodie on Jan 12, 2016, 21:49:06
I asked my welder friend about welding cast iron and cast alloy.

His response was he can braise the iron and "Fuck that" for the alloy.

So Axtell make "ductile iron" cylinders. I wonder if it is worth finding one of them.
Title: Re: Brodie's Bastard BSA
Post by: Hurco550 on Jan 12, 2016, 21:50:10
What's is there room to move the studs out a bit on the case?
Title: Re: Brodie's Bastard BSA
Post by: Brodie on Jan 12, 2016, 21:53:40
Would have to move the studs in a bit. But the hole would end up elongated

My 2 plans involve finding a big bore cylinder with wider bolt pattern or running the flat head and using a 5 speed gearbox with small rear sprocket.

I would prefer the first. But I think building a plate to fit around the cylinder base and having that braised on, the correct bolt spacing drilled might be the go. Just worried about braise strength.
Title: Re: Brodie's Bastard BSA
Post by: Hurco550 on Jan 12, 2016, 22:38:58
You could loctite in aluminum studs then machine new holes without welding. I've done that a bunch on different equipment. Never a bike (for full disclosure) but it should work all the same
Title: Re: Brodie's Bastard BSA
Post by: Tune-A-Fishİ on Jan 12, 2016, 23:07:43
cant the cast be cad welded shut and re drilled? take some filings and get it tested mang.
Title: Re: Brodie's Bastard BSA
Post by: xb33bsa on Jan 13, 2016, 10:40:17
the cast iron can be cast iron welded, but you need to find that guy ,a real qualified expert
,material can be added and built up .its an oxy-acetelyne process ,requires careful, even ,slow,hi temp preheat and slow cooldown in the oven as well
Title: Re: Brodie's Bastard BSA
Post by: xb33bsa on Jan 13, 2016, 10:47:09
ok i see how the hole misses now.a slightly elongated hole is not a big issue as long as you can ad a heavy washer that will not distort
the other minor issue is to have the barrel clocked correctly and extra dowel or 2 would suffice
but those holes in the barrel are a basic very easy job for a qualified EXPERIENCED well know expert cast iron jockey
these guys are used to really broken shit,usually antique  that cannot be replaced ,a nice clean easy to see barrel job like that , a walk in the park
Title: Re: Brodie's Bastard BSA
Post by: Tune-A-Fishİ on Jan 13, 2016, 10:56:32
Why not heat, nickel rod weld and bury in hot sand... loooks like it will all be under the jug so wont see the chiney weld.

I dont see threads so must have nuts backside no? maybe turn the jug just a few deg and fill the holes with lead leaving it a few thou proud topside to ease off with a file. Push rods wont mind a slight angle and tubes can be cussum fit with some leather seals soaked in hot wax.
Title: Re: Brodie's Bastard BSA
Post by: xb33bsa on Jan 13, 2016, 12:48:07
nikel is for tempory "fixes" it aint no good the problem is the weld can easily be too hot which fucks with the carbon in the iron making a hard as spot, right where it needs to be, drilled agin :-[
i bet he could get it iron welded ,and faces machined for under 300 that would be money well spent
Title: Re: Brodie's Bastard BSA
Post by: Hurco550 on Jan 13, 2016, 13:17:18
I'm still thinking modified aluminum cases. They are aluminum right? Much easier to work with than modding cast iron
Title: Re: Brodie's Bastard BSA
Post by: xb33bsa on Jan 13, 2016, 14:41:05
I'm still thinking modified aluminum cases. They are aluminum right? Much easier to work with than modding cast iron

nevrer to be a bsa agin  :'( :'( by god you dont buggger as first wirst  ,bah ! the barrels are expendable
Title: Re: Brodie's Bastard BSA
Post by: Hurco550 on Jan 13, 2016, 14:53:03
Lol I have little morals when it comes to bikes. Even bsa. To me, better to be modified and ran than not touched and sitting. There is a line though. If it were a Vincent or something nah,  but a modded thumper bsa... weld er up. Of course, my opinion only.
Title: Re: Brodie's Bastard BSA
Post by: Brodie on Jan 14, 2016, 11:39:34
If I can get away without making changes to the case I will. Just ordered some Evo base gaskets, see how close they are.

If I have to alter the case I may as well use a better head design.
Title: Re: Brodie's Bastard BSA
Post by: Hurco550 on Jan 14, 2016, 11:46:09
If I have to alter the case I may as well use a better head design.

yep, evo could be a good way to go. im liking this!
Title: Re: Brodie's Bastard BSA
Post by: Brodie on Jan 22, 2016, 01:42:02
The more I look at this the more I think a Shovelhead would be the way to go. The rear cylinder appears to have enough meat on it that I could have holes driller where I need them to match up to the studs.

On the other hand, this engine has a stroke of 112mm. The Evo Sportster has a stroke of 96.83mm.
The M21 has a bore of 82mm. The 1200cc Evo Sporster has a bore of 88.85mm

So 112mm stroke and 88.85mm bore = 694cc
Who wouldn't want a 700 single with no starter motor! hmm maybe a lot of people.

So the 15~mm difference in stroke can be used to create an adapter plate for the different bolt patterns. Since two of the Evo bolts line up! (photo soon)

Here is a quick drawing to explain my idea.
Title: Re: Brodie's Bastard BSA
Post by: pacomotorstuff on Jan 22, 2016, 11:48:07
Brodie,
The Matchless 500 I learned to ride on had a decompressor lever to ease starting - wondered if something similar could be done in your case?  If I remember correctly, it opened the exhaust valve just a tad when you were kicking the bike.
BTW, outstanding creativity on your part - I always liked the A10's too.
Pat
Title: Re: Brodie's Bastard BSA
Post by: damiansd on Jan 22, 2016, 19:27:56
You are a braver man than I. You can still cut your losses and make a profit on parting it out.

Good luck mate
D
Title: Re: Brodie's Bastard BSA
Post by: datadavid on Jan 22, 2016, 21:00:16
Dont really see the problem welding either cast iron or alloy?
We welded up a broken cast iron steering axle for forklifters size ++ in school. Used a bit of torch pre and post weld and stainless rod. No magic really, just easy with the heat and careful with the tempering.
As for cast alloy, whats he talking about? Its perfectly weldable!
Although adapter plate seems the way to go in this case..
Be sure to film your first few kicks! ;)
Title: Re: Brodie's Bastard BSA
Post by: irk miller on Jan 22, 2016, 23:46:51
I'm with this guy.  Welded the gear box on a Fate Root Heath pug mill cast iron gear box during rebuild and it's going strong.  Rose bud tip pre and post.  All good. 
Title: Re: Brodie's Bastard BSA
Post by: Brodie on Jan 23, 2016, 01:10:18
Ok so if I were to heat up the cast iron with a propane torch. Have it welded and the sick it in a bucket and cover it with sand, would that equate to a strong weld?

Sadly the evo bolts slightly overlap the m21 bolts. So it looks like unless I make two adaptor plates that won't work.

I can either weld up the shovelhead cylinder base to have it fit. Or weld up the stud holes in the BSA case and have new holes drilled to suit which ever top end I plan on using.

Anyone have experience with those hts2000 alloy "brazing/welding" rods. Will they hold well enough for a thread to be placed in it?
Title: Re: Brodie's Bastard BSA
Post by: datadavid on Jan 23, 2016, 06:17:57


Ok so if I were to heat up the cast iron with a propane torch. Have it welded and the sick it in a bucket and cover it with sand, would that equate to a strong weld?

Sadly the evo bolts slightly overlap the m21 bolts. So it looks like unless I make two adaptor plates that won't work.

I can either weld up the shovelhead cylinder base to have it fit. Or weld up the stud holes in the BSA case and have new holes drilled to suit which ever top end I plan on using.

Anyone have experience with those hts2000 alloy "brazing/welding" rods. Will they hold well enough for a thread to be placed in it?

No experience with those.
But brazing with pure zinc anodes will give you harder material to tap, though it will be more brittle as well.

I would suggest finding out which precise alloy was used for the cases, then select tig filler accordingly. Usually AlSi5 does the trick, though i would personally try to keep the original stud holes if they are fresh.
Title: Re: Brodie's Bastard BSA
Post by: Tune-A-Fishİ on Jan 23, 2016, 10:27:37
Flip the cylinder upside down and take a picture of both the cylinder and the case.

I am thinking you should modify the cylinder not the case if at all possible. You could fabricate a collar with two halves much like a Kawasaki exhaust flange but with 4 holes 2 overlapping like this: If you can plug the voids with lead just to seal (a tad proud for pinch) you might not need to weld anything.

(http://u-kanaya.com/images/mhk.jpg)
Title: Re: Brodie's Bastard BSA
Post by: Brodie on Jan 25, 2016, 21:30:18
So bear with me here as I am kind of just letting ideas flow from my brain.

I have been looking into every type of pushrod engine I can think of. BMW R models, VW Beetles, Harleys, every old Brit bike I can think of. Then it hits me, "Aren't the new Enfields pushrod?"
So after a quick look into the engine I have found that the top half of the cylinder has a casting around it yet the lower half does not. Here is a picture for an example.

(http://www.almosauto.in/media/catalog/product/cache/1/thumbnail/600x600/9df78eab33525d08d6e5fb8d27136e95/r/o/royal-enfield-cylinder-piston-kit.jpg)

The valve adjustment box is located on the lower end of the Enfield engine... so the cylinder sleave protrudes into it. They also have a bore in the range I need, 84mm-87mm. The stroke is at 90mm compared to the 112mm of the M21.
SO, If I cut the scrap cylinder in half and use that as the adapter I can keep the stock lower bolt location and just bolt the new Enfield stuff to the newly tapped holes in the "spacer" cylinder.


I think I might be onto something here.
Title: Re: Brodie's Bastard BSA
Post by: JustinLonghorn on Jan 25, 2016, 22:07:45
I am starting to think you may be a Kiwi with all of this ingenuity. Ha. Keep up the good work, man!
Title: Re: Brodie's Bastard BSA
Post by: Brodie on Jan 25, 2016, 22:49:58
Haha I only just watched the movie as inspiration. It nearly has me casting my own cylinder.

I am glad that I have possibly sorted out a solution that doesn't include welding on the case or being concerned about the strength of the weld on the cylinder.

I have ordered a base gasket and once it arrives I will be able to sort out if this can be done. After that I will order a cylinder and a head. Enfield parts are cheap.

Which leads to another question. Efi or carb?
Title: Re: Brodie's Bastard BSA
Post by: JustinLonghorn on Jan 25, 2016, 23:38:14
Turbo.
Title: Re: Brodie's Bastard BSA
Post by: Tune-A-Fishİ on Jan 25, 2016, 23:40:52
Get it running on carb then the sky is the limit
Title: Re: Brodie's Bastard BSA
Post by: goldy on Jan 26, 2016, 07:07:23
Oh yeah! I like this thread, keep it coming!!!
Title: Re: Brodie's Bastard BSA
Post by: pacomotorstuff on Jan 26, 2016, 09:35:22
I love posts like yours, Brodie - keep up the great work.
I read in a mid-sixties motorcycle magazine, one set of cylinders Burt Munro made for his Indian started out as water pipe (seamless?), with the fins sweated on (interference fit) - would something similar work for you?
I figured you had looked at getting a cylinder cast up, but pattern making is a lot of work for just one or two pieces and blessed expensive if you have to farm it out (don't know what you have for foundries down under, either).
Keep at it.
Pat
Title: Re: Brodie's Bastard BSA
Post by: Brodie on Feb 01, 2016, 02:12:43
Thanks guys, getting there slowly.

A bloke at work had also mentioned Bert making a cylinder out of seamless water pipe and pressing cooling fins on. I am sure I could use this as a last resort. At the moment the Enfield cylinder seems to be the way to go. I am looking at getting a high compression piston and getting a machine shop to create the right height out of the two cylinders.

OK so I managed to score a NOS Lucas Magdyno. They are few and far between here in Aus, I asked Beachcomber to keep an eye out for me and he came up with the same results I was. So I bit the bullet and bought one from the US.

That should be arriving soon and will at leas complete the "spark" part a petrol engine needs to run.

I have also bought an Albion 4 Speed Gearbox which looks to be off an early 50s English Royal Enfield Bullet. The gap between 3 and 4 is decent so I should be able to set up 4th as a highway gear and have the other 3 for around town. Hopefully with the torque that the engine will produce the long gearing won't leave me searching for power in hills.

The seller of the gearbox doesn't seem to be the best at communication so I am still waiting to see if it has been posted or not.
Title: Re: Brodie's Bastard BSA
Post by: goldy on Feb 01, 2016, 07:08:33
Good score on the Mag and gearbox...I hope they arrive sooner than later. If the gearbox has the neutral finder you're going to like it. I sure wouldn't worry about torque...even with the lowly the side valve head, they could pull a house down. :D
Title: Re: Brodie's Bastard BSA
Post by: Brodie on Feb 02, 2016, 08:10:23
Gearbox arrived today. Tucks in neat like I had hoped. Mag shouldn't be too far off. Maybe next week.

The RE base gasket should be here by then as well.

The gearbox needs a rebuild as the output shaft is bound to the input shaft. It also seems to have an issue shifting to 4th and there is a tiny rattle if I shake it.

As far as the frame goes. Looking at Goldy's build is helping me determine what lugs have been put on to the frame and what is stock.
Because I am building a single it looks like I will need to modify the frame to allow the bottom end to sit in the frame. The oil pump is stopping it and these frames come with a kink in them to allow clearance of the oil pump on singles.

Has anyone bought from "Royalmotorcycles" before? Their parts are a hell of a lot cheaper because of the conversion rate and they say they will ship international. Makes this build a hell of a lot quicker if I have access to more funds by saving on parts.
Title: Re: Brodie's Bastard BSA
Post by: Brodie on Feb 03, 2016, 01:50:02
(http://images.tapatalk-cdn.com/16/02/02/35c6e7f3ad0caabbae9a965262056c27.jpg)(http://images.tapatalk-cdn.com/16/02/02/453d783aac5c7a0313ea381eabdd3385.jpg)
(http://images.tapatalk-cdn.com/16/02/02/40f12620cae95dc94a424c6f982b6d0c.jpg)(http://images.tapatalk-cdn.com/16/02/02/311ac78bb3da318a59006d35d4ca5781.jpg)

So I found them rattlin' bits in the gearbox.

Looks like I am up for a new sliding gear and a new batch gear. At least that is what they are called on all the part sites.

The lack of any oil or grease in the gearbox also has me concerned. I know it has not been taken apart in the past 30 years and it was a PITA to pull apart, infact the input shaft nut is still stuck on.
Title: Re: Brodie's Bastard BSA
Post by: goldy on Feb 03, 2016, 07:28:41
Guess I've been lucky with old gearboxes...so may of the ones I have rebuilt have looked absolutely horrid on the outside, but more often than not, they were usually in pretty decent shape internally.  Anyhow, stick with it...you will have a fully functional gearbox before you know it!
Title: Re: Brodie's Bastard BSA
Post by: Brodie on Feb 03, 2016, 08:45:17
Yep. Just bought a replacement sliding gear. Not easy to find. Looks like it is from a twin.

The new gearboxes have a 18/21 sliding gear where as this has a 21/25
Title: Re: Brodie's Bastard BSA
Post by: Brodie on Feb 05, 2016, 19:32:40
So from what I can find this gearbox is a road race ratio box and parts are hard to come by. I have found a new sliding gear but am having a hard time finding a 30 tooth main lay shaft gear which also serves as the kick gear. The teeth look like they have been broken off for some time and I believe it to be the reason this box was set aside for so long.

Going to a swap meet next month and will see if I can find a gear for it there. If not I may have to get a new one made up.
Title: Re: Brodie's Bastard BSA
Post by: Erskine on Feb 06, 2016, 06:17:43
If you get very stuck on sourcing parts PM me, lots of old gits here in the UK with stuff squirrelled away in their sheds.
Title: Re: Brodie's Bastard BSA
Post by: Brodie on Feb 09, 2016, 01:29:07
(http://images.tapatalk-cdn.com/16/02/08/e408b5f81cbb6eb1903205974463e199.jpg)
(http://images.tapatalk-cdn.com/16/02/08/3a3404c957b1442f8e73c294913f6e57.jpg)

Magdyno arrived today. Cost me a bloody fortune but it works very well, everything is there and it even has a few stainless parts added on. Very clean as well, looks as if it just had a rebuild inside.
Title: Re: Brodie's Bastard BSA
Post by: goldy on Feb 09, 2016, 08:24:38
Looks like you have a good set there...whatever it cost, it was probably worth it. A decent magdyno will make the difference between a bike that starts first kick and one that you have to kick until you have a stroke to get it running. :)
Title: Re: Brodie's Bastard BSA
Post by: Brodie on Feb 12, 2016, 06:31:15
(http://images.tapatalk-cdn.com/16/02/12/4f14d2ee173a8f0deaedc4503ec41d78.jpg)

Forgot to post this one up.

Looks like the pushrod angle might be off a bit. Shouldn't be to much of a problem though.
Title: Re: Brodie's Bastard BSA
Post by: Brodie on Feb 14, 2016, 20:08:20
I had a thought when I was looking at the head and base gasket sitting on top of the M20 cylinder.
Why do I need to cut that up? I need a box for the pushrod adjustment but why do I need that one? Won't it be much easier to just have flanges made up to match both bolt styles of the bases and then just get the spacing right between them for the stroke and weld a section of pipe with cooling fins and a tappet box between them.

Looks like I will be heading down to my local machine shop some time soon.
Title: Re: Brodie's Bastard BSA
Post by: Tune-A-Fishİ on Feb 14, 2016, 20:54:25
I had a thought when I was looking at the head and base gasket sitting on top of the M20 cylinder.
Why do I need to cut that up? I need a box for the pushrod adjustment but why do I need that one? Won't it be much easier to just have flanges made up to match both bolt styles of the bases and then just get the spacing right between them for the stroke and weld a section of pipe with cooling fins and a tappet box between them.

Looks like I will be heading down to my local machine shop some time soon.

Ats what I was thinking you were planning, why not use some cast finned tube and adjustable rods.

(http://www.ekstromsvarme.se/ElemImage/Fintubes(1)_700.jpg)
Title: Re: Brodie's Bastard BSA
Post by: Brodie on Feb 15, 2016, 00:35:00
Hmm, interesting option. I was going to try and avoid cast since it is a pain to weld on. I was tossing up between alloy or steel. Might even be able to do it in stainless if the boys at work will help me out.
Title: Re: Brodie's Bastard BSA
Post by: Tune-A-Fishİ on Feb 15, 2016, 00:41:26
Hmm, interesting option. I was going to try and avoid cast since it is a pain to weld on. I was tossing up between alloy or steel. Might even be able to do it in stainless if the boys at work will help me out.

"Cast" can be easy to weld "cast iron" is full of crap so it's tough, you can weld cast aluminum and cast steel much easier.

I built up this float post yesterday, looks like crap because it's so small and it kept falling through just as the metal flowed out. took a few shots but it worked fine.

(http://uploads.tapatalk-cdn.com/20160213/de01ade8c259849f69fbb8cdf8adc06d.jpg)

(http://uploads.tapatalk-cdn.com/20160213/76745ce5d34d05fdd79758bf4828193d.jpg)
Title: Re: Brodie's Bastard BSA
Post by: Tune-A-Fishİ on Feb 15, 2016, 00:49:02
Oh and those fins are fusion welded to mild steel tube. The tube will be easy to weld with heliarc, mig or stick
Title: Re: Brodie's Bastard BSA
Post by: Brodie on Feb 15, 2016, 00:51:04
Thanks Tune, looks like this will be the way to go then. Do you have a link for the mild steel stuff?

Ohh and that float post would have been a pain to weld because of the size. Nice work mate.
Title: Re: Brodie's Bastard BSA
Post by: Tune-A-Fishİ on Feb 15, 2016, 00:55:05
This the site from the image, likely someone closer to you or a supplier close.

http://www.ekstromsvarme.se/finnedtubes.html
Title: Re: Brodie's Bastard BSA
Post by: Brodie on Feb 15, 2016, 01:07:32
Cheers mate, thought you might have had a supplier. Had a look at a few other sites like that.

So now I just new to get the cylinder flanges made. It is all coming together now.

Hmm I wonder if there is an old pasteurizer laying around work somewhere...
Title: Re: Brodie's Bastard BSA
Post by: datadavid on Feb 15, 2016, 09:00:54
So from what I can find this gearbox is a road race ratio box and parts are hard to come by. I have found a new sliding gear but am having a hard time finding a 30 tooth main lay shaft gear which also serves as the kick gear. The teeth look like they have been broken off for some time and I believe it to be the reason this box was set aside for so long.

Going to a swap meet next month and will see if I can find a gear for it there. If not I may have to get a new one made up.
Teeth can be welded up with stellite and ground to shape, then again its a cost issue, diminishing returns and whatnot
Title: Re: Brodie's Bastard BSA
Post by: datadavid on Feb 15, 2016, 09:04:18
This the site from the image, likely someone closer to you or a supplier close.

http://www.ekstromsvarme.se/finnedtubes.html
Swedish quality!!
Title: Re: Brodie's Bastard BSA
Post by: Tune-A-Fishİ on Feb 15, 2016, 09:09:11
You are Fin yea? My family on dads side came to the US from Finland
Title: Re: Brodie's Bastard BSA
Post by: Brodie on Feb 16, 2016, 03:12:12
I hope Swan doesn't mind me borrowing an image of his beautiful Gold Star to use as a base for a "Inspirational" example of what the finished motor should look like.
(https://lh4.googleusercontent.com/-oTc-8dTwsE4/VsLLSjIDaQI/AAAAAAAAA8Y/rSnIxRtwMs4/w2048-h1238-no/BSA%2BBullet.jpg)

So by the look of that the motor won't look to out of place.
Title: Re: Brodie's Bastard BSA
Post by: goldy on Feb 16, 2016, 07:45:23
Yup, there's inspiration for ya'. If it runs as good as it looks you are going to be pretty tickled.
Title: Re: Brodie's Bastard BSA
Post by: Brodie on Feb 16, 2016, 07:48:22
Yep. Took me a little to Photoshop that top end in there but it looks fairly inconspicuous. Which is what I am going for. I hope to be able to show up at a few historical rallies and have a lot of old blokes scratch their heads.
Title: Re: Brodie's Bastard BSA
Post by: goldy on Feb 16, 2016, 09:14:48
Ha-ha! Yes!  I used to do that sort of thing with an A65 onto which I grafted the plunger tail end from an early A10. Had a lot of people scratching their noggins and saying stuff like "What's an H-57? I thought I knew all the BSA models."

You topped that Gold Star engine off with Royal Enfield goods, right?
Title: Re: Brodie's Bastard BSA
Post by: Brodie on Feb 16, 2016, 18:02:43
Yep, I pasted a 2012 Bullet top end over Swans gold star engine.

My main concern at the moment is the height of the complete engine. Being my frame is an A10 I already need to clearance the frame to fit the oil pump past, which I hope allows enough room for the RE top.
Title: Re: Brodie's Bastard BSA
Post by: Brodie on Feb 18, 2016, 03:34:44
Just walked in to the shed to find this.
I think I need a better bike stand. Goes to show the weight of this. It is not a light bike.

(http://images.tapatalk-cdn.com/16/02/17/f9c6504c3b582970e2228e9fcb1fcf3a.jpg)
Title: Re: Brodie's Bastard BSA
Post by: goldy on Feb 18, 2016, 07:43:23
Ouch! I hope nothing got damaged.
I friend of mine has a wooden lift, he made it about 10 years ago and swears by it. I think I still have the plans. If you're interested I'll pass them along.
Title: Re: Brodie's Bastard BSA
Post by: Brodie on Feb 18, 2016, 07:51:44
There is a small cut in the seat at the rear. The vinyl is not the best so I had considered getting it redone in the future.

I would love the plans for a wooden lift. I should be able to build it fairly quick given the amount of timber I have available.
Title: Re: Brodie's Bastard BSA
Post by: goldy on Feb 18, 2016, 08:05:54
I thought it would take me days to find it, but fate seems to be on my side today. I hope this thing will take these files...Here you go:

Title: Re: Brodie's Bastard BSA
Post by: goldy on Feb 18, 2016, 08:11:39
Well...that didn't work. PM me your email and I'll send them to you that way. Meanwhile I'll try to save them as something that I can post in case other people might be interested too.
Title: Re: Brodie's Bastard BSA
Post by: Brodie on Feb 18, 2016, 08:12:24
Thanks mate, I managed to download them onto my phone. Just don't have a way of opening them.

PM inbound.

EDIT: Managed to open them. Very sturdy looking lift. I like the design.
Title: Re: Brodie's Bastard BSA
Post by: irk miller on Feb 18, 2016, 08:30:47
Well...that didn't work. PM me your email and I'll send them to you that way. Meanwhile I'll try to save them as something that I can post in case other people might be interested too.
I was able to download them and open them up no problem. If you have a gmail account, you can upload the files to Google Drive and open them with Google Docs on a mobile device.  I opened them up with Microsoft Word to look at them, but I won't print them, so I'll use Docs to reference them in the future. 

It's an excellent design.  Thanks for sharing.
Title: Re: Brodie's Bastard BSA
Post by: goldy on Feb 18, 2016, 08:31:34
Alright, I scanned them and saved them as a JEPEG...lets see what happens this time:



Title: Re: Brodie's Bastard BSA
Post by: Brodie on Feb 18, 2016, 08:41:03
Ahh that is better. I was missing the two hand drawings.
Title: Re: Brodie's Bastard BSA
Post by: JustinLonghorn on Feb 18, 2016, 11:09:27
Just walked in to the shed to find this.
I think I need a better bike stand. Goes to show the weight of this. It is not a light bike.

(http://images.tapatalk-cdn.com/16/02/17/f9c6504c3b582970e2228e9fcb1fcf3a.jpg)

I had a 400F do this to me once, unfortunately I was under it. Ha
Title: Re: Brodie's Bastard BSA
Post by: Tune-A-Fishİ on Feb 18, 2016, 11:22:56
Hope all is okay ! 

http://www.ebay.com/itm/Motorcycle-Cycle-Dirt-Bike-ATV-Scissor-Floor-Jack-Lift-Center-Stand-2yr-Warr-/400952133163?hash=item5d5a9c062b:m:meHnfsnTgXNh3fNc4veLtLg&vxp=mtr
Title: Re: Brodie's Bastard BSA
Post by: Hurco550 on Feb 18, 2016, 14:06:48
Hope all is okay ! 

http://www.ebay.com/itm/Motorcycle-Cycle-Dirt-Bike-ATV-Scissor-Floor-Jack-Lift-Center-Stand-2yr-Warr-/400952133163?hash=item5d5a9c062b:m:meHnfsnTgXNh3fNc4veLtLg&vxp=mtr

I just saw one of those the other day in person, the identical one... I don't know if it would have the clearance to get under a street bike. looked more setup for dirtbike jazz
Title: Re: Brodie's Bastard BSA
Post by: frogman on Feb 18, 2016, 14:10:59
I use a jack similar to this with my toys, works well. I like being able to roll things around the shop and it fits under one of my benches when not in use.

http://www.harborfreight.com/1500-lb-capacity-atvmotorcycle-lift-61632.html
Title: Re: Brodie's Bastard BSA
Post by: unclerob on Feb 18, 2016, 14:19:45
Thought you might find this interesting, its on ebay in the UK now....
Title: Re: Brodie's Bastard BSA
Post by: Brodie on Mar 14, 2016, 05:15:13
So I went to a swap meet over the weekend. Didn't get enough time there because of family commitments but from what I can see it looks like I am out of luck for the main gear. I was so close to buying a BSA gearbox but it was pulled out from under me by someone who had made an offer earlier and decided to go with the price the seller wanted.
Title: Re: Brodie's Bastard BSA
Post by: Brodie on Mar 14, 2016, 05:18:53
Ohh and I am still unsure about what to do with the engine. I had heard from a lot of the blokes at the swap meet that the M21 can have a Yamaha 600 piston fitted and it will go very well.

I am tempted to work on a big bore flat head, mainly because I don't want to put the kink in the frame for the oil pump.
If I could work out the height of the BSfield engine without buying the parts and it fit within the frame I would go with it. Hmm

Anyway my mind is a mess with thoughts so here is a picture of the "roller"
(http://images.tapatalk-cdn.com/16/03/14/38993d4e3c495d3913ac55d19fccc1ce.jpg)
Title: Re: Brodie's Bastard BSA
Post by: goldy on Mar 14, 2016, 06:35:44
Well...keep hunting, you'll settle on something eventually. The roller looks great!
Title: Re: Brodie's Bastard BSA
Post by: Brodie on Mar 14, 2016, 07:04:15
Going to go have a look at some parts tomorrow. See what I come up with.
Title: Re: Brodie's Bastard BSA
Post by: Tune-A-Fishİ on Mar 14, 2016, 08:28:19
Don't drop out mang thinking kills brain cells but doing rebuilds them so:


Done yet?
Title: Re: Brodie's Bastard BSA
Post by: Brodie on Mar 20, 2016, 19:56:12
So I bought a M21 crank case set with a better condition barrel that I had. The part lot also came with 1 and 3/4 "BSA Gearbox", turns out they are C11 boxes. Looks like I will clean them up and make my money back. Grabbed a few things off the other cases that were missing on mine, such as the exhaust tappet adjustment bolts and the studs for the magdyno.

I also had the liner pressed out of the barrel leaving me with a 88mm hole to be bored out and honed. This is an "ol' trick" I heard about from a few people and should bring the engine up to between 710 and 750cc depending on the size of the bore.
So yes. My mind has been made up, I will be building the flathead big bore engine with a bit of work to the head and a modern piston to raise the CR to a decent number. Stock is 5:1, I want to try for 7:1


Ohh and to chronicle my BSfield engine I will leave some info on what I have found to be the combo needed.

M20 lower end (due to 94mm stroke, allowing for a shorter engine.)
Enfield GT 87mm piston (Giving a close to square engine size)

This will create an engine with 560cc.

The reason I chose not to build this was because I do not want to have to cut and bend my frame to fit the oil pump into the frame. If I was to I would much rather trade the frame for a single frame, most of which are used as Goldie replicas.
Title: Re: Brodie's Bastard BSA
Post by: Brodie on Apr 20, 2016, 10:20:31
So I have had the cylinder linder pressed out and taken the cylinder in to get new valve seats and valve train fitted. I just need to find a 92mm piston with a 20mm pin and a flat top before I get the cylinder bored.

Then I will have to get the small end bush bored out to fit the 20mm pin and rebuild the lower end and she should be set to go.

Gotta love the simplicity of a flathead engine.

Title: Re: Brodie's Bastard BSA
Post by: VonYinzer on Apr 20, 2016, 12:10:01
Pistons from a VW Beetle 1835cc kit are 92mm. Wrist pin is right at 20mm too I believe.
Title: Re: Brodie's Bastard BSA
Post by: VonYinzer on Apr 20, 2016, 12:11:19
http://www.ebay.com/itm/VW-Bug-Piston-1835cc-Type-A-Volkswagen-92mm-Piston-Type-1-Mahle-/322081358558?hash=item4afd8b82de:g:uy0AAOSwZ8ZW770a&vxp=mtr

Not sure as to the skirt and height measurements though...
Title: Re: Brodie's Bastard BSA
Post by: Tune-A-Fishİ on Apr 20, 2016, 12:23:14
http://www.ebay.com/itm/VW-Bug-Piston-1835cc-Type-A-Volkswagen-92mm-Piston-Type-1-Mahle-/322081358558?hash=item4afd8b82de:g:uy0AAOSwZ8ZW770a&vxp=mtr

Not sure as to the skirt and height measurements though...

Skirt seems to be short enough
Title: Re: Brodie's Bastard BSA
Post by: Brodie on Apr 20, 2016, 18:43:30
I was thinking the VW piston might be a bit heavy. Wonder if a klx400 piston would work. Might get higher compression with one.

But the VW does match my budget better.

Sent from my ASUS_Z00AD using DO THE TON mobile app (http://'https://siteowners.tapatalk.com/byo/displayAndDownloadByoApp?rid=89466')

Title: Re: Brodie's Bastard BSA
Post by: VonYinzer on Apr 20, 2016, 19:15:09
Those aftermarket pistons are plenty light. If you dog around a bit I'm sure the weights are listed online somewhere.
Title: Re: Brodie's Bastard BSA
Post by: Brodie on Apr 20, 2016, 20:02:17
I cannot find any VW 92mm piston in Aus that aren't a part of a kit.

Does anyone know the wrist pin size of a '83 XT550? They are a 92mm standard bore and have a flat crown.

Sent from my ASUS_Z00AD using DO THE TON mobile app (http://'https://siteowners.tapatalk.com/byo/displayAndDownloadByoApp?rid=89466')

Title: Re: Brodie's Bastard BSA
Post by: Tune-A-Fishİ on Apr 20, 2016, 20:24:23
Looking like 20mm

http://www.tkrj.co.jp/goods/m-BY0500A-583-.php
Title: Re: Brodie's Bastard BSA
Post by: Brodie on Apr 20, 2016, 20:35:02
Awesome. That must be the mysterious "Yamaha Piston" I was told would fit by one of the old blokes at a swap meet.
Title: Re: Brodie's Bastard BSA
Post by: Tune-A-Fishİ on Apr 20, 2016, 20:39:36
Awesome. That must be the mysterious "Yamaha Piston" I was told would fit by one of the old blokes at a swap meet.

Yep good stuff!! the 600 goes to 22mm
Title: Re: Brodie's Bastard BSA
Post by: Erskine on Apr 20, 2016, 20:56:21
Rock on
Title: Re: Brodie's Bastard BSA
Post by: Brodie on Apr 20, 2016, 21:54:15
Thanks for the help Tune.

This is going to be one big "lawn mower" engine. Haha

I just dropped into the engine builders and asked them about the seats they are using. Some kind of steel alloy. He said it will work fine for unleaded. They still have not commenced work, but I did tell them not to rush it.
While I was there I asked about piston crown types and he recommended using either flat or slightly domed. So the XT550 piston is a go.
I came up with some stupid plan in my head to press out the bush on the lower end and fit a dished piston from a 2l subaru. I was thinking the dish would help the flame front push the piston down. I had hoped that a lower wristpin height would make up for the compression.

The engineer just said, "don't over complicate it, this is a 60 year old engine remember"

So there is that. 112 stroke 92 bore = 744.6cc.
Then do the usual round up and we have a 750cc single. Sounds good to me.
Title: Re: Brodie's Bastard BSA
Post by: Tune-A-Fishİ on Apr 20, 2016, 22:17:06
I would start designing in a compression release
Title: Re: Brodie's Bastard BSA
Post by: Brodie on Apr 20, 2016, 22:18:54
It has one stock. Lucky me. Not that I have the parts. It just lifts the exhaust valve off the seat.

I was thinking of using one in the head instead though. That way I can move the spark plug to a better location.
Title: Re: Brodie's Bastard BSA
Post by: goldy on Apr 21, 2016, 07:23:55
Better start hitting the gym, you're going to have to get that kicking leg in good shape! It ought to be able to pull down a barn! :D Cool build Brodie , keep it coming!!!!
Title: Re: Brodie's Bastard BSA
Post by: Brodie on Apr 22, 2016, 18:53:54
Not sure if I could ever get my leg strong enough to pull down a barn, but I sure do hope the bike will haha.

My plan is to buy a few different primary sprockets and see where the engine needs to be for what I want it to do.

Ideally I want it to cruise at 100kph for a few hours and be able to pull me (6'1 110kg) up some mountains at a reasonable pace.
Big ask from an old flathead but that is the fun in it, getting all I can from such a simple engine.
Title: Re: Brodie's Bastard BSA
Post by: Kanticoy on Apr 22, 2016, 20:27:11
I am thoroughly enjoying the "Frankenstein-ing " going on in this build. Just my style!


Sent from my iPhone using Tapatalk
Title: Re: Brodie's Bastard BSA
Post by: Brodie on Jun 14, 2016, 03:39:59
Just a quick update. I went by the engine shop and the new valves are in, new seats installed in to the head.

I was advised to go a 91mm bore for longevity of the cylinder. I am still unsure as 1mm extra is 20cc more.

Sadly the valve collars Modak sent me are the wrong type. I suspect they may be for the b series.
Title: Re: Brodie's Bastard BSA
Post by: Brodie on Jul 22, 2016, 07:40:23
I have been searching for new piston in my price range and it looks as if I will be using a 92mm VW piston. I can get a set for $180 and have a few spares for the life of the engine.

Been a bit broke lately due to the new job, rates, water, rego and building a lean to next to the shed so no progress yet.

Still considering using a different rear hub as I am worried about the clearance that the GS hub has.
Title: Re: Brodie's Bastard BSA
Post by: Hurco550 on Oct 19, 2016, 18:43:49
any updates on this thing???
Title: Re: Brodie's Bastard BSA
Post by: Brodie on Oct 19, 2016, 19:05:48
Ohh yeah, I just forgot to post.

Got the cylinder back, had the new valves fitted.

(http://uploads.tapatalk-cdn.com/20161019/bbd35303f75194972b93268644638455.jpg)
(http://uploads.tapatalk-cdn.com/20161019/d4f649b78c8f617e75892ec7b56fa40a.jpg)
Title: Re: Brodie's Bastard BSA
Post by: Hurco550 on Oct 19, 2016, 19:47:27
just so im caught up, your not using a hardly ableson top end anymore right?
Title: Re: Brodie's Bastard BSA
Post by: Brodie on Oct 19, 2016, 19:58:55
Not for now. The M20 bottom end is better suited due to the shorter stroke. I have the M21. So the plan is to go a 740cc flat head with minor flow work.
Title: Re: Brodie's Bastard BSA
Post by: Hurco550 on Oct 19, 2016, 20:03:52
Not for now. The M20 bottom end is better suited due to the shorter stroke. I have the M21. So the plan is to go a 740cc flat head with minor flow work.

Rock on man. gonna be sweet!!
Title: Re: Brodie's Bastard BSA
Post by: Erskine on Oct 21, 2016, 04:19:35
Nice :)
Title: Re: Brodie's Bastard BSA
Post by: Tune-A-Fishİ on Oct 21, 2016, 20:35:31
Briggs and Stratton  :o
Title: Re: Brodie's Bastard BSA
Post by: Brodie on Oct 21, 2016, 21:06:13
Haha Biggs and Strokken more like.
Title: Re: Brodie's Bastard BSA
Post by: Brodie on Nov 28, 2016, 18:15:36
I got a head...




Cast iron with a few missing fins but otherwise in good condition. At a bargain price to.
Title: Re: Brodie's Bastard BSA
Post by: spotty on Nov 28, 2016, 18:37:20
who's a lucky boy then

oops, sorry, I only read the first line and jumped to the wrong conclusion

congratulations on the new mechanical parts then
Title: Re: Brodie's Bastard BSA
Post by: Brodie on Dec 02, 2016, 00:27:38
No so mechanical. Just a well shaped plate. Good ol' sidevalves.
Title: Re: Brodie's Bastard BSA
Post by: xb33bsa on Dec 02, 2016, 02:13:59
glad to see your making progress if you haven't read any on the last flathead harley race bikes its very in teresting reading
i had read it years ago and found the article online for you
it seems higher cr was not a hp maker but shaped piston domes to aid combustion  chamber filling was the key
https://books.google.com/books?id=QGMMRS3b0KQC&pg=RA7-PA54&lpg=RA7-PA54&dq=jerry+branch+harley+kr&source=bl&ots=rHv-M29xs_&sig=lxTh_XgW4v71JWQcbAx1AeYxXMQ&hl=en&sa=X&ved=0ahUKEwjlm6uG7NTQAhVRx2MKHZrLCqwQ6AEIXTAM#v=onepage&q=jerry%20branch%20harley%20kr&f=false
Title: Re: Brodie's Bastard BSA
Post by: Brodie on Feb 03, 2017, 20:01:50
I think I just found the piston I need in the price range I can afford.

From a Honda GX390..

Which is also a pushrod. Ohh god here I go again with the OHV shit.


I might actually have a source for the parts in Aus. Hmm time to dig deeper.
Title: Re: Brodie's Bastard BSA
Post by: goldy on Feb 04, 2017, 08:20:17
I was starting to wonder if you had given up on 'er. Good stuff, keep it coming! :)
Title: Re: Brodie's Bastard BSA
Post by: Tune-A-Fishİ on Feb 04, 2017, 09:06:52
I was starting to wonder if you had given up on 'er. Good stuff, keep it coming! :)
Get er did mang!
Title: Re: Brodie's Bastard BSA
Post by: Brodie on Feb 04, 2017, 11:07:58
Haha no way am I giving up. It is just 40+ Celsius in my workshop at the moment.

Always planning what to do next.
Title: Re: Brodie's Bastard BSA
Post by: Brodie on Feb 06, 2017, 00:07:52
Alright I need help from engine gurus regarding valve sizing for this new iteration.

From what I can find this head has a 40mm intake for the "big port" version.

Will this be big enough for a 680-720cc engine?

The other issue is that this head would require me to have a forward facing carby. I understand the issues of ram air on carbs but wanted to know if a decent airbox would prevent the issue occurring.
Title: Re: Brodie's Bastard BSA
Post by: spotty on Feb 06, 2017, 00:26:49
what are the issues with forward facing carbs? I've seen it done to loads of old triumph/bsa's and Yamaha did it to the last of the TZR's
is it not beneficial to be forcing more air in the faster you go?
Title: Re: Brodie's Bastard BSA
Post by: Brodie on Feb 06, 2017, 00:30:20
From what I have read the issue is with the venturi effect being compromised by air being forced into the carb. Hard to tune when you have air coming at the carb at different speeds during the same RPM through gear changes. I am not the best at tuning so maybe there is a way around or maybe what I have read doesn't really matter.

I would guess a CV carb would be out because of the slide.

Title: Re: Brodie's Bastard BSA
Post by: Brodie on Feb 10, 2017, 17:37:33
Ok my plan is to build the flathead with a 92mm piston and use the spare cases to design the ohv motor when I have more time and cash.

If I get hung up on the motor I will never finish this build.
Title: Re: Brodie's Bastard BSA
Post by: Brodie on Feb 11, 2017, 18:21:50
(https://uploads.tapatalk-cdn.com/20170211/e58d412af93e8afb9f71dbb90c0499a9.jpg)
Title: Re: Brodie's Bastard BSA
Post by: goldy on Feb 12, 2017, 11:57:00
That'll get you down the road! :)
Title: Re: Brodie's Bastard BSA
Post by: Brodie on Apr 23, 2017, 21:04:18
So I have acquired a carb for this bike providing I can get it working right.

I bought a new set of carbs for my XV1100 and have the stock pair left over. Should be able to get it fitted to this.
Title: Re: Brodie's Bastard BSA
Post by: spotty on Apr 23, 2017, 21:19:07
So I have acquired a carb for this bike providing I can get it working right.

I bought a new set of carbs for my XV1100 and have the stock pair left over. Should be able to get it fitted to this.

yeah, cos they were working so well on the yam....LOL
Title: Re: Brodie's Bastard BSA
Post by: Brodie on Apr 23, 2017, 22:20:13
Haha yep. If I can make one good one...

I won't deny I am a cheap bastard
Title: Re: Brodie's Bastard BSA
Post by: spotty on Apr 23, 2017, 22:41:13
also if you find you have more than the expected amount of oil leaks from that engine you might want to try putting the plate back over those valve lifters, it prob won't make that much difference but worth a try
Title: Re: Brodie's Bastard BSA
Post by: Brodie on Apr 24, 2017, 00:16:45
Ha yeah I have to make one yet