Question about 2002 Honda CR 125 R

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I have a 1998 cr 125 i just bought it and when i rode it it didnt seem like it had any power no low end and it took forever to get it up to speed i put new reeds in it but that didnt help so i took the engine out of the bike and just got the top end off we thought the crank seals might be bad but when we got the cylinder off and looked at it the piston and cylinder was pretty scared and one of the exhaust valves wont open or shut do you think this i the problems and not the seals in the crank? it had 120psi compression

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120 psi means you need top end( should be around 160psi) if you can feel the score marks with your finger you will have to have the cylinder bored and install a over-sized piston kit,if you cant feel them than you can have it honed.....now the stuck power valve is why you didn't have any power,take them out and clean all the carbon deposits off them and reinstall, pay close attention to how they come out so you can put them back the same way...if you have a manual you can check the adjustment specs on them also.....now on to the crank,the first indication of bad crank seals or bearings is losing your trany fluid,if you don't feel any unusual vibration or hear any unusual whining or have a large amount of lost trany fluid your probably OK with the crank.......yz-maniac

Posted on Sep 12, 2010

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