Author Topic: A sort of BSA  (Read 125 times)

Online Greybeard

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A sort of BSA
« on: 15.07. 2019 13:06 »
Another Facebook scrape:

Geoff Stray says, "This is my 'Evans BSA'. The bike was originally developed between 1984 and 1998. Engineer Owen Evans designed and built the engine over 4 years from 84 to 88. It was covered in magazine articles in 1988 and 1995. I got hold of it after it had been under a tarp for 18 years. Only the top ends are BSA (B50) - the rest is Norton Dominator and Norton Commando. It does go rather well though. The crankcases and crankshaft were handmade; ccm camshafts and oil pump (modified); no decompressors - so compression ratio had to be reduced slightly  to about 9.5:1 to render starting just possible."

https://youtu.be/-C3OlhFx7Q8

Online RDfella

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Re: A sort of BSA
« Reply #1 on: 15.07. 2019 14:04 »
Neat job, but can't help thinking the exhausts would look so much neater if they were 2 into 1.
'49 B31, '49 M21, '53 DOT, '58 Flash, '00 Firestorm, Weslake sprint bike.

Online Greybeard

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Re: A sort of BSA
« Reply #2 on: 15.07. 2019 19:19 »
...can't help thinking the exhausts would look so much neater if they were 2 into 1.
They sort of go 2 into 1 into 2

Online RoyC

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Re: A sort of BSA
« Reply #3 on: 15.07. 2019 20:37 »
...can't help thinking the exhausts would look so much neater if they were 2 into 1.
They sort of go 2 into 1 into 2


It's an X pipe, done to scavenge the gasses out of the cylinders.

https://www.youtube.com/watch?v=Dd43rwLHEW4
My bike is a 1958 A7SS
Stafford UK