Author Topic: More problems starting.  (Read 2791 times)

Online RDfella

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Re: More problems starting.
« Reply #90 on: 27.11. 2019 12:01 »
Agree with Swarfy, BSA etc - the machinist is right - I wouldn't risk trying to machine such a small amount. Always a risk it won't stay centre of bore and then it's oval and oversize.
Honing is the answer. Indeed, you normally bore undersize and then hone to size. Need coarse stones first as S & B suggest, finishing the last 1 to 1 1/2 thou with fine. Total about half an hour. Sounds like the machinist knows what he's doing but is unfamiliar with engine cylinders.
'49 B31, '49 M21, '53 DOT, '58 Flash, '00 Firestorm, Weslake sprint bike.

Offline BSAmoto

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Re: More problems starting.
« Reply #91 on: 27.11. 2019 15:11 »
Start with a 100 or 150 corn and finish the last 1/2thou with a 400. This gives a very long lasting barrel as the spikes of surface are platoed by the 400 thus the oil holding channels are still there but the surface gets more area of contact.

Offline AdrianJ

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Re: More problems starting.
« Reply #92 on: 10.04. 2020 13:07 »
Finally bike is running and together. Thanks all of you for all your help.
Pictures posted in Stories etc.
Adrian
'53 Plunger Flash, Steib S500.