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Author Topic: Brodie's Bastard BSA  (Read 21748 times)

Online Brodie

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Re: Brodie's Bastard BSA
« Reply #30 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.
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 #31 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
"If you just picked up a drug habbit instead of a kawasaki triple at least you could get high while you waste money"
~ bradj
1988 tw200, the swamp donkey: http://www.dotheton.com/forum/index.php?topic=75455.0
2006 Suzuki DR650 Adventure monowheel trailer build: http://www.dotheton.com/forum/index.php?topic=75033.0
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
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
"much ingenuity with a little money is more profitable and amusing than much money without ingenuity" - Arnold Bennet

Offline Tune-A-Fishİ

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Re: Brodie's Bastard BSA
« Reply #32 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.
"I didn't come here and I ain't leavin"  Willie Nelson

"love hard, live fast, die fun" Kacey Musgraves

"Like a Wreckin Ball!" Eric Church

Offline xb33bsa

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Re: Brodie's Bastard BSA
« Reply #33 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

Offline xb33bsa

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Re: Brodie's Bastard BSA
« Reply #34 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

Offline Tune-A-Fishİ

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Re: Brodie's Bastard BSA
« Reply #35 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.
"I didn't come here and I ain't leavin"  Willie Nelson

"love hard, live fast, die fun" Kacey Musgraves

"Like a Wreckin Ball!" Eric Church

Offline xb33bsa

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Re: Brodie's Bastard BSA
« Reply #36 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

Offline Hurco550

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Re: Brodie's Bastard BSA
« Reply #37 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
"If you just picked up a drug habbit instead of a kawasaki triple at least you could get high while you waste money"
~ bradj
1988 tw200, the swamp donkey: http://www.dotheton.com/forum/index.php?topic=75455.0
2006 Suzuki DR650 Adventure monowheel trailer build: http://www.dotheton.com/forum/index.php?topic=75033.0
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
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
"much ingenuity with a little money is more profitable and amusing than much money without ingenuity" - Arnold Bennet

Offline xb33bsa

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Re: Brodie's Bastard BSA
« Reply #38 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

Offline Hurco550

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Re: Brodie's Bastard BSA
« Reply #39 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.
"If you just picked up a drug habbit instead of a kawasaki triple at least you could get high while you waste money"
~ bradj
1988 tw200, the swamp donkey: http://www.dotheton.com/forum/index.php?topic=75455.0
2006 Suzuki DR650 Adventure monowheel trailer build: http://www.dotheton.com/forum/index.php?topic=75033.0
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
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
"much ingenuity with a little money is more profitable and amusing than much money without ingenuity" - Arnold Bennet