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Canadian Daves JustKDX
KDX200 needs help
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[QUOTE="Tom H, post: 605472, member: 19742"] I went out this morning and took it off the work stand so I could kick it hard without killing myself. With the throttle full open, it will only muster about 102 psi. If it is 'sposed to be 165, sounds like I have no compression. The rings are new. The piston looked acceptable, & only has 1 year of light riding. I did have to take the old ring and scrape out the top ring gap to get the new ring to seat fully. The bore looks good. The rings had about a .012 gap, and the ring ends are in the little notch that holds them in place. What to do next? Will leaky crankseals affect top end compression? If so, sounds like I need to do a leakdown test to be sure I didn't somehow screw up the seal installation. But I dont have the resources to do the bottom end test... (I'm positive I didn't put a seal in backwards, which would be a reasonable question) One thing I dont understand; the reason I changed the crank seals in the first place is that the bottom end blew gas/air into the crankcase. It would blow all of the transmission oil out of the transmission vent. I also hear that it will suck transmission oil into the crankcase. I know the crankcase cycles from a positive to negative pressure. Can the seals fail either just under pressure or under vacuum as opposed to both? [/QUOTE]
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Dirt Bike Discussions By Brand
Canadian Daves JustKDX
KDX200 needs help
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