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Everything Dirt Bike
Make / Model Specific
Yamaha
1993 Yamaha WR500 Top End Inspection
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<blockquote data-quote="SRAD97750" data-source="post: 183914" data-attributes="member: 425"><p>These carry-over yz490 motors have always been steel. I think the 250cc of 93 was definitely nikasil coated.</p><p>This one has hundreds of hours, still stock bore.</p><p>I have decided that to really hold this thing at 100% takes a superhuman effort, so they seems to last forever with my mediocre riding skills. <img src="https://www.dirtbikeaddicts.com/static/images/smilies/smirk.gif" class="smilie" loading="lazy" alt=":smirk:" title="Smirk :smirk:" data-shortname=":smirk:" />-BIG DAN</p></blockquote><p></p>
[QUOTE="SRAD97750, post: 183914, member: 425"] These carry-over yz490 motors have always been steel. I think the 250cc of 93 was definitely nikasil coated. This one has hundreds of hours, still stock bore. I have decided that to really hold this thing at 100% takes a superhuman effort, so they seems to last forever with my mediocre riding skills. :smirk:-BIG DAN [/QUOTE]
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Everything Dirt Bike
Make / Model Specific
Yamaha
1993 Yamaha WR500 Top End Inspection
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