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Dirt Bike Brands - Other
Top end rebuild question
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[QUOTE="Rcannon, post: 815263, member: 26263"] I would say replacing the top end is a great idea. For a long time I used my compression tester to evaluate top ends. 95% of the time you could detect a drop in compression. Changing the piston and rings would restore the lost psi. Then I crossed paths with a 2002 CR 80. The owner is one of my best friends. His son rides the bike HARD. Anyway, we tested the compression when the bike was new. I then tested it three month later. Nothing much changed. We presumed the top end to be ok and sent the boy out. Three minutes later we hear "that" sound. The 80 stopped instantly. We ran up to him . I climbed on the bike and kicked it. The bike started on the first kick. There was no comprression loss. The noise coming from the engine sounded bad. Turned out that several chunks of the piston skirt had broken off. The piston was still attached to the con rod. It took us several hours to get the aluminum out of the lower end. We lucked out and got out all the small pieces. There is a chunk mossing from the lower case, but it has not caused any problems since. I put the compression tester away and have never used it again. We now replace the top end every 4 weeks. In my opinion, there is not much to be gained by checking compression. If you run a top end long enough to lose compression, you may be risking having the piston gernade. For the small dollar savings, it is not worth it. Change it out. That is the cool part abotu our "outdated" two strokes. A top end job is easy and cheap. [/QUOTE]
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Dirt Bike Discussions By Brand
Dirt Bike Brands - Other
Top end rebuild question
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