November 6, 2016
Looking at photographs of B175 cylinder heads I notice some mysterious little round things stuck in between the cylinder head fins. Presumably these are there to stop the head from 'ringing' but I may be wrong. I cannot see a part number for them in the book.
I bought a NOS B175 cyclinder head once but it did not come with the little round things in it. Can anybody throw some light on these little round things - what are they, why are they there, can you still get them or can you make your own and do they make any difference anyway ?????
I have noticed similar things in Japanese 2 stroke cylinders.
September 30, 2011
Don't panic, I have never seen them on a B175 head or any other Bantam head for that matter. They are round bits of a rubbery material probably.
The idea was to stop a sort of ringing sound created by the fins due to engine vibration. As you say they are used on many Japanese bikes, my Honda CB400N has them.
If you could get hold of some that would fit between the fins on your B175 head it may make the engine quieter, but I doubt that it would make any difference.
My guess is that they may be effective on long, thin aluminium fins.
January 24, 2012
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