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Kawasaki MX & Off-Road Dirt Bikes
KX85 scored cylinder
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[QUOTE="IndyMX, post: 1400061, member: 71057"] We just replaced the top end on my nephews 2007 KX85 a few weeks ago. Everything went fine.. no issues with the install. He heat cycled it as he should and we thought everything was going perfect with it. He put about 3 hours on the rebuild, and at one point in the day stopped the bike normally. When he went to start it back up, it wouldn't fire. We tried all the basics, new plug, lay it over for a minute.. everything. No fire. So, I did a compression test, got 60psi (spec is 119 to 185). Tore the engine down yesterday, and here's what I found... Can anyone help me understand why this may have happened? The piston didn't seem to have any issues, it's snug in the cylinder like it should be. The rings were properly measured for end gap before install. How can a piston rock in the bore so far up if it's tight at the bottom of the bore? I'm leaning toward an over heat, but I'd think that would cause the whole cylinder to seize, not just the exhaust port. [/QUOTE]
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Dirt Bike Discussions By Brand
Kawasaki MX & Off-Road Dirt Bikes
KX85 scored cylinder
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