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Everything Dirt Bike
Make / Model Specific
Yamaha
The 1999 YZ250
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<blockquote data-quote="Mihylo33" data-source="post: 210977" data-attributes="member: 408"><p>My instinct is telling me the bottom plug is too lean and the upper one is correct.</p><p> Yes it has some gunk on it but Yamalube is one of those sooty oils imo. The bottom plug has the carbon chipping off which leads me to believe lean knock.</p><p></p><p>Chances are that you might be lugging the bike in fear of a massive power hit. Just speculation on my behalf. The working power range in that bike is about 7-10,000 rpm I believe.</p></blockquote><p></p>
[QUOTE="Mihylo33, post: 210977, member: 408"] My instinct is telling me the bottom plug is too lean and the upper one is correct. Yes it has some gunk on it but Yamalube is one of those sooty oils imo. The bottom plug has the carbon chipping off which leads me to believe lean knock. Chances are that you might be lugging the bike in fear of a massive power hit. Just speculation on my behalf. The working power range in that bike is about 7-10,000 rpm I believe. [/QUOTE]
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Everything Dirt Bike
Make / Model Specific
Yamaha
The 1999 YZ250
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