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Message: [QUOTE="spanky250, post: 44253, member: 20897"] A compression test will give some indication of the top-end condition, but the only way to really tell is to pull it apart and measure ring end-gap. When I do a top-end, I measure the compression after break-in for a baseline, and then recheck it after every 2 or 3 rides. Once the engine has lost about 10% of the baseline compression, it is time for a rebuild. With only 40 hours on your KDX, I doubt it needs a top-end yet, they have probably the longest lasting top-end of any two-stroke you can buy (except maybe a PW50 ;) ). My engine is closer to a KX 250 than a KDX 200, and I still get 60-70 hours between top-ends. ------------------ 1992 KDX 250-FMF porting,two-stage power reeds, Fatty pipe, Power Core silencer,titanium rod,Wiseco Ultra-lite, Pro-Action suspension...Why didn't I take the blue pill??? [/QUOTE]