Question about 2001 CCM 604 RS Roadster
I have the same problem,the bike went into a local dealer 14 months ago,head skimmed by 3 thou and new sealing ring,valves re cut etc,its done 570 miles since and just gone again,as you can imagine they dont really want to know,cost 350 pounds,not sure what to do next i cant keep skimming the head so perhaps break it and give up,any idea on how to stop it leaking please
Is the barrel surface ok ? if they did the total job then its down to them !! citizen advice people should be able to help also !
Posted on Jan 22, 2014
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Posted on Jan 02, 2017
SOURCE: cylinder head skim
From my understanding, the combustion area of the head should have a diameter that is the same as the cylinder i.e. 56mm. If you took 0.5mm from a standard head, your squish would PROBABLY be Ok, however, you need to measure this. Its quite easy, poke a piece of solder wire in to the cylinder via the spark plug hole and trap it between the piston and the head by gently turning the engine over with the kickstarter by hand. Remove the squashed solder wire and measure with a set of vernier calipers. 0.8mm is about right and as Elf said, anything below this is getting a bit close. Do this for the front, back and left and right of each cylinder. Reducing the squish only has only a moderate effect on the compression ratio and does not require higher octane fule. I did this for mine and it was fine - so you 'should' be Ok.
Posted on Nov 20, 2008
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