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Everything Dirt Bike
Make / Model Specific
Yamaha
2006 YZ250
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<blockquote data-quote="2Wheels" data-source="post: 224027" data-attributes="member: 3804"><p>Well I’m no rocket surgeon so I just go by the manual and mine says </p><p>“<strong>Premium unleaded gasoline only with a Research Otcatne Rating of 95 or higher”</strong></p><p>Which means at (r+m/2) his 91 is probably not cutting it.</p><p>Also it says</p><p>“<strong>If knocking or pinging occurs use a higher octane grade”</strong></p><p>Didn’t say anything about redesigning their motor.</p><p>I used a 50/50 race fuel and swapped 3 pretty pistons for new before sending the head out for a redo in more than one 250t and never “decked” a single head or blew a hole in a piston from det. Though I’m not saying it doesn’t happen. If it ain’t rattling run it. And run it hard.</p></blockquote><p></p>
[QUOTE="2Wheels, post: 224027, member: 3804"] Well I’m no rocket surgeon so I just go by the manual and mine says “[B]Premium unleaded gasoline only with a Research Otcatne Rating of 95 or higher”[/B] Which means at (r+m/2) his 91 is probably not cutting it. Also it says “[B]If knocking or pinging occurs use a higher octane grade”[/B] Didn’t say anything about redesigning their motor. I used a 50/50 race fuel and swapped 3 pretty pistons for new before sending the head out for a redo in more than one 250t and never “decked” a single head or blew a hole in a piston from det. Though I’m not saying it doesn’t happen. If it ain’t rattling run it. And run it hard. [/QUOTE]
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Everything Dirt Bike
Make / Model Specific
Yamaha
2006 YZ250
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