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Message: [QUOTE="dave Olejnik, post: 1190282, member: 77463"] I bought my brother a 84 cr125 for his first bike. The motor was saposeably rebuilt 1-2 years ago. The problem were having is it is almost impossible to start. we have to pullstart it forever to get it running. I checked everything it said to check in the repair book. I found The motor has low compression. It is only at 70 psi The honda dealer said it should be at least 130-150. It doesnt look like there is a problem with the gasket so Im guessing The motor needs new rings and possibly a piston. My question is How hard is this to do? Ive never rebuilt a 2 stroke engine. I have the manual that tells you step by step how to do this. But what do you think. Should I atempt it? If I do should I take the piston, and the cylnder to the dealer to make sure I get the right piston,and rings. And get the cylnder honed. I believe the motor is already 040 over. Is there anything else I should check before tearing it apart? My brother did overfill the clutch and transmission case with oil. I thought maybe he blew a seal and that was causing the low compression. But now that I think of it It always did seam to have low compression,and was always hard to start. What do you think I should do? I cant aford a 4-5 hundred dollar repair bill. [/QUOTE]