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Everything Dirt Bike
Make / Model Specific
Yamaha
Exhaust coming out of power valve drain tube
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<blockquote data-quote="SRAD97750" data-source="post: 170996" data-attributes="member: 425"><p>The photos of the head HAD tell-tale detonation. Absolutely no doubt in my mind it had pinging issues at some point. BUT, the piston that is currently installed has not had the same issues, AT ALL. Looks like it got fixed before you got a hold of her. No worries, one of my bike's has the same evidence, runs awesome today.</p><p></p><p>[ATTACH=full]22180[/ATTACH] </p><p></p><p>So, back to the topic at hand...</p><p></p><p>You cleaned out the power valve cavity and linkages, GOOOD. That was most likely the issue with your bog. I would spray a bunch of carb cleaner into that area to ensure the powervalve doesn't bind at all, and reassemble the engine.</p><p></p><p>Clean the carb while you're at it. No reason to ignore it while she's out.</p><p></p><p>Try riding it again. Report back! -BIG DAN<img src="https://www.dirtbikeaddicts.com/static/images/smilies/thumb.gif" class="smilie" loading="lazy" alt=":thumb:" title="Thumb :thumb:" data-shortname=":thumb:" /></p></blockquote><p></p>
[QUOTE="SRAD97750, post: 170996, member: 425"] The photos of the head HAD tell-tale detonation. Absolutely no doubt in my mind it had pinging issues at some point. BUT, the piston that is currently installed has not had the same issues, AT ALL. Looks like it got fixed before you got a hold of her. No worries, one of my bike's has the same evidence, runs awesome today. [ATTACH=full]22180[/ATTACH] So, back to the topic at hand... You cleaned out the power valve cavity and linkages, GOOOD. That was most likely the issue with your bog. I would spray a bunch of carb cleaner into that area to ensure the powervalve doesn't bind at all, and reassemble the engine. Clean the carb while you're at it. No reason to ignore it while she's out. Try riding it again. Report back! -BIG DAN:thumb: [/QUOTE]
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Everything Dirt Bike
Make / Model Specific
Yamaha
Exhaust coming out of power valve drain tube
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