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Everything Dirt Bike
Make / Model Specific
Yamaha
2006 YZ250
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<blockquote data-quote="Mihylo33" data-source="post: 224012" data-attributes="member: 408"><p>It’s the squish band. The amount of space between the head surface and the piston surface at top dead center. You will need someone to cut the head and mill it for pump gas. Common issue for the YZ 125 and 250. </p><p>If you fire up the google machine you can probably find 200 places across the US that will exchange your head for a cut one as it was a common popular mod. </p><p>Also I wouldn’t use avgas in my 2T. It’s formulated for a much different type of engine that works at very low rpm like a tractor. You can use it but not with the same success you’ll get with a VP gas. As for race gas in a whole, unless you have a complete worked motor, head shaved, ported and cut cylinder, matched cases and more then running straight race gas is a waste. I mix mine around 25% race gas (VP C-12) and 75% pump. The only reason why I run it that way is because 1: it’s a waste of money to run it 50% or more because my motor is only mildly tuned and I’m not racing at the pro level. </p><p>I benefited from the crisp throttle response and ease of jetting by using That mix.</p></blockquote><p></p>
[QUOTE="Mihylo33, post: 224012, member: 408"] It’s the squish band. The amount of space between the head surface and the piston surface at top dead center. You will need someone to cut the head and mill it for pump gas. Common issue for the YZ 125 and 250. If you fire up the google machine you can probably find 200 places across the US that will exchange your head for a cut one as it was a common popular mod. Also I wouldn’t use avgas in my 2T. It’s formulated for a much different type of engine that works at very low rpm like a tractor. You can use it but not with the same success you’ll get with a VP gas. As for race gas in a whole, unless you have a complete worked motor, head shaved, ported and cut cylinder, matched cases and more then running straight race gas is a waste. I mix mine around 25% race gas (VP C-12) and 75% pump. The only reason why I run it that way is because 1: it’s a waste of money to run it 50% or more because my motor is only mildly tuned and I’m not racing at the pro level. I benefited from the crisp throttle response and ease of jetting by using That mix. [/QUOTE]
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Everything Dirt Bike
Make / Model Specific
Yamaha
2006 YZ250
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