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350 Bullet into a 500 Bullet ??? #153040
11/06/07 5:07 am
11/06/07 5:07 am
Joined: Jul 2007
Posts: 22
Montreal, Qc, Can.
v8doog Offline OP
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v8doog  Offline OP
BritBike Forum member

Joined: Jul 2007
Posts: 22
Montreal, Qc, Can.
Hi guys,
Is it possible to convert a 1949 350cc Bullet into a 500cc.
I know this type of modification can usualy only be done if the main shaft is the same for both engines.
Thanks


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Re: 350 Bullet into a 500 Bullet ??? #153041
11/06/07 2:39 pm
11/06/07 2:39 pm
Joined: Mar 2005
Posts: 2,502
upstate ny
G
George Elston Offline
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George Elston  Offline
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G

Joined: Mar 2005
Posts: 2,502
upstate ny
Yves
The stroke is the same only the bore is different . 70x90 vs 84x90 . Whether this requires a different cylinder or just an overbore I don't know .
George


57 Woodsman
64 Interceptor
58 Trailblazer
59 Constellation
64 500 Sport twin
61 Hornet

2001 W650
1966 W1
Re: 350 Bullet into a 500 Bullet ??? #153042
11/07/07 12:13 am
11/07/07 12:13 am
Joined: Jul 2007
Posts: 22
Montreal, Qc, Can.
v8doog Offline OP
BritBike Forum member
v8doog  Offline OP
BritBike Forum member

Joined: Jul 2007
Posts: 22
Montreal, Qc, Can.
But you wouldn't know if everything is the same down in the engine case ?

Is it possible to fit a 500cc jug instead of the 350cc jug ( using the same bolt patern )??

Thanks.


Enjoy life, it's the only thing worth living for !!!
Re: 350 Bullet into a 500 Bullet ??? #153043
11/07/07 2:09 pm
11/07/07 2:09 pm
Joined: Mar 2005
Posts: 2,502
upstate ny
G
George Elston Offline
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George Elston  Offline
BritBike Forum member
G

Joined: Mar 2005
Posts: 2,502
upstate ny
Yves
As the difference in bore is 14 MM it woould seem this would be too much for an overbore so I suspect the cylinders are different internally . As far as anything I have read all else internally is the same . Someone with more knowledge will be along soon I suspect and set me straight .
George


57 Woodsman
64 Interceptor
58 Trailblazer
59 Constellation
64 500 Sport twin
61 Hornet

2001 W650
1966 W1
Re: 350 Bullet into a 500 Bullet ??? #153044
11/07/07 2:46 pm
11/07/07 2:46 pm
Joined: Jul 2002
Posts: 604
England
Tom_dup1 Offline
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Tom_dup1  Offline
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Joined: Jul 2002
Posts: 604
England
Tollgate Classics here in England were offering a 450cc conversion for 350's. Which would suggest a bore of 79mm (ish).I don't think they stroked it. Perhaps a BSA B40 or B44 piston might fit (these being 79mm std)depending on the gudgeon pin diameter. Depends though, how much meat there is in the cylinder.

And no, I am not that more knowledgeable person. laughing

www.tollgateclassics.co.uk/

HTH

Tom



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