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Author Topic: Brodie's Bastard BSA  (Read 17283 times)

Offline Brodie

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Brodie's Bastard BSA
« 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.


Top Tree Design V1


The Frame after a quick paint

Lovely 20 year build up of crust.


Rockers and cam seem ok

And its on fire...
« Last Edit: Jul 30, 2015, 01:32:11 by Brodie »
I'm not sure, but don't ask Brodie.

Way to many build and half done projects to list here.
Sr250, Gs750, Z50A, XV1100, A10, Z160A.

Offline Brodie

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Re: Brodie's Bastard BSA
« Reply #1 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.
« Last Edit: Jul 30, 2015, 01:41:27 by Brodie »
I'm not sure, but don't ask Brodie.

Way to many build and half done projects to list here.
Sr250, Gs750, Z50A, XV1100, A10, Z160A.

Offline Brodie

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Re: Brodie's Bastard BSA
« Reply #2 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.
I'm not sure, but don't ask Brodie.

Way to many build and half done projects to list here.
Sr250, Gs750, Z50A, XV1100, A10, Z160A.

Offline Brodie

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Re: Brodie's Bastard BSA
« Reply #3 on: Oct 17, 2015, 00:39:12 »


Lovely looking roller. See if I can get some parts to fill it out at the swap meet next weekend.
I'm not sure, but don't ask Brodie.

Way to many build and half done projects to list here.
Sr250, Gs750, Z50A, XV1100, A10, Z160A.

Offline Hurco550

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Re: Brodie's Bastard BSA
« Reply #4 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 =)
Keep er' Between The Ditches!!!

1976 BMW R90/6 farkilitious: http://www.dotheton.com/forum/index.php?topic=74349.msg882477#msg882477
1975 RD350 Road Racer: http://www.dotheton.com/forum/index.php?topic=70652.msg833688#msg833688
1973 Ironhead Hardtail: http://www.dotheton.com/forum/index.php?topic=68135.msg788081#msg788081
1976 GT250 Rebuild: http://www.dotheton.com/forum/index.php?topic=64973.new#new
Full Custom Pit Bike: http://www.dotheton.com/forum/index.php?topic=66954.new#new
1971 Yamaha 90cc twin HS1: http://www.dotheton.com/forum/index.php?topic=70498.0
"Two strokes are the motorcycle equivalent to Thors chariot. Full of glory and memories of battles victorious" ~ von yinzer

Offline goldy

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Re: Brodie's Bastard BSA
« Reply #5 on: Oct 17, 2015, 09:33:50 »
An interesting project for sure! Looking good so far...good solid frame too. Keep us posted!
1948 Norton ES2
1954 AJS 20B (project)
1956 Triumph TRW
1968 Triumph T100 special
1969 Norton Commando
1973 XL350 special

Offline Brodie

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Re: Brodie's Bastard BSA
« Reply #6 on: Oct 24, 2015, 02:32:43 »
Speaking of petrol tanks... I managed to pick up this beauty at a swap meet for cheap!



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
I'm not sure, but don't ask Brodie.

Way to many build and half done projects to list here.
Sr250, Gs750, Z50A, XV1100, A10, Z160A.

Offline Hurco550

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Re: Brodie's Bastard BSA
« Reply #7 on: Oct 27, 2015, 21:43:26 »
that's a beaut man =) nice score on that tank!
Keep er' Between The Ditches!!!

1976 BMW R90/6 farkilitious: http://www.dotheton.com/forum/index.php?topic=74349.msg882477#msg882477
1975 RD350 Road Racer: http://www.dotheton.com/forum/index.php?topic=70652.msg833688#msg833688
1973 Ironhead Hardtail: http://www.dotheton.com/forum/index.php?topic=68135.msg788081#msg788081
1976 GT250 Rebuild: http://www.dotheton.com/forum/index.php?topic=64973.new#new
Full Custom Pit Bike: http://www.dotheton.com/forum/index.php?topic=66954.new#new
1971 Yamaha 90cc twin HS1: http://www.dotheton.com/forum/index.php?topic=70498.0
"Two strokes are the motorcycle equivalent to Thors chariot. Full of glory and memories of battles victorious" ~ von yinzer

Offline xb33bsa

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Re: Brodie's Bastard BSA
« Reply #8 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  :'(

Offline Brodie

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Re: Brodie's Bastard BSA
« Reply #9 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.
I'm not sure, but don't ask Brodie.

Way to many build and half done projects to list here.
Sr250, Gs750, Z50A, XV1100, A10, Z160A.