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Cb 200 rings

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shifter:
I have acquired a cb200 ,compression was not good having stripped down both top rings are broken I am going to fit New rings no bore wear really , am a bit confused to ring gap as the manual spec states end ring gap 6thou, but many people say times x the bore (55.51) x 4 = 9 thou . Can someone advise me what gap I should go for .

AshimotoK0:
Factory manual here:

https://www.dropbox.com/s/asg04geu6ucxy6u/CB200%20CL200%20factory%20service%20manual.pdf?dl=0

6 thou" is the minimum. I think I did my CD175 to about 8 thou. TBH if it has been bored properly / not worn and you are using Genuine, new, Honda rings, the gap is usually bang on anyway.

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shifter:
Ash ,I’m fitting +25rings on standard bores and filing the gap ,..... as the manual states standard gap is 6 thou , having asked around some engineers  say times the bore x 4 which = 9 thou .so I’m a bit confused Thankyou for you’re reply Ash .

AshimotoK0:

--- Quote from: shifter on May 24, 2021, 09:35:11 AM ---Ash ,I’m fitting +25rings on standard bores and filing the gap ,..... as the manual states standard gap is 6 thou , having asked around some engineers  say times the bore x 4 which = 9 thou .so I’m a bit confused Thankyou for you’re reply Ash .

--- End quote ---

Not a fan of using over-size rings in standard bore but lets see what Trigger, Oddjob  & Bryan think as they are pro's on engines on here.

Bryanj:
Dont do it they wont be round, you need standard rings

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