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Yamaha MX & Off-Road Dirt Bikes
'99 YZ250 suddenly stopped running
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[QUOTE="MXTex, post: 133218, member: 17501"] I removed the cylinder this morning. If I can get hold of a digital camera, I'll post pictures. Here's what I found. - Two gouges running down the intake side of the piston. They are in line with one of the intake transfer ports. I can feel two small ridges on this port. - The top of the piston has small metal particals of unknown origin stuck to the top. - Both rings appear to be complete although they are both jammed into their grooves very hard. (can't get them out) - The wrist pin was very difficult to get out. I fabricated a pusher to get it out; and when it did come out, it was in two pieces. I don't see how this would be the source of the piston gouges. Questions: - Potential source of metal particals. Presumably they are what also caused the piston guoges. - Cylinder verdict. The bore looks fine although that intact port does have two slight ridges. - How do you flush the bottom end. Mineral Sprits? I'd appreciate any feedback regarding source of these problems and corrective action. I'll definitely be giving Eric a call. Thanks, Jim [/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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