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Yamaha MX & Off-Road Dirt Bikes
'99 YZ250 suddenly stopped running
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[QUOTE="EricGorr, post: 134075, member: 19611"] Hi guys, Jim and I talked on the phone yesterday and the wrist pin was shattered. We think that the problem originated in the big end bearing, with the needle cage fracturing and scattering up the cylinder wall. The previous owner said that the bottom end was recently rebuilt. If the crank became wedged upon installation with the impact method, (meaning the flyweights are not parallel) then the resultant crank run-out could of caused excess vibration and the bearing damage. Suzuki makes a special tool that draws the crankshaft into the left side crankcase main bearing. This makes it real easy to assemble the engine. I think the tendency for most home mechanics is to reach for the dead-shot plastic mallet. Jim Neupert and I will disassemble the engine and keep you updated on exactly what happened to this engine. [/QUOTE]
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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
'99 YZ250 suddenly stopped running
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