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Everything Dirt Bike
Make / Model Specific
Yamaha
1993 Yamaha WR500 Top End Inspection
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<blockquote data-quote="cleonard" data-source="post: 184055" data-attributes="member: 21"><p>Replace the piston. Just about aspect of a piston is engineered. What I see missing is the surface texture on the sides. The function is to retain lubricant. On the first as removed pic it appears to have been worn off over a lot of the sides. Looks to be almost all gone in after the wire brushing.</p><p></p><p>That said, you could just run it. On a two stroke it might just cause a tiny amount of excess wear. </p><p></p><p>A lot of times surface discoloration is just visual. I use the measuring devices, but sometimes simply running your fingernail across a part to see if it catches on something can identify issues pretty well. </p><p></p><p>In conclusion it's a big bore two stroke. As long as you don't seize it or run it really hard they can go way longer than the smaller two strokes.</p></blockquote><p></p>
[QUOTE="cleonard, post: 184055, member: 21"] Replace the piston. Just about aspect of a piston is engineered. What I see missing is the surface texture on the sides. The function is to retain lubricant. On the first as removed pic it appears to have been worn off over a lot of the sides. Looks to be almost all gone in after the wire brushing. That said, you could just run it. On a two stroke it might just cause a tiny amount of excess wear. A lot of times surface discoloration is just visual. I use the measuring devices, but sometimes simply running your fingernail across a part to see if it catches on something can identify issues pretty well. In conclusion it's a big bore two stroke. As long as you don't seize it or run it really hard they can go way longer than the smaller two strokes. [/QUOTE]
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Everything Dirt Bike
Make / Model Specific
Yamaha
1993 Yamaha WR500 Top End Inspection
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