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Everything Dirt Bike
Make / Model Specific
Yamaha
yz 125 problem
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<blockquote data-quote="ossagp" data-source="post: 187176" data-attributes="member: 1650"><p>Yep. It's called increasing the intake duration. The opening and closing of the intake pOrt was controlled by the size and placement of the port in combination with the piston skirt. Cut away too much and you were blowing back through the carburetor when the downward motion started the transfer process. Once we started using reed valves you could have basically raised the skirt up to the rings. With a case breather like all the 125's ended up with the holes and windows are really not all that useful.</p></blockquote><p></p>
[QUOTE="ossagp, post: 187176, member: 1650"] Yep. It's called increasing the intake duration. The opening and closing of the intake pOrt was controlled by the size and placement of the port in combination with the piston skirt. Cut away too much and you were blowing back through the carburetor when the downward motion started the transfer process. Once we started using reed valves you could have basically raised the skirt up to the rings. With a case breather like all the 125's ended up with the holes and windows are really not all that useful. [/QUOTE]
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Everything Dirt Bike
Make / Model Specific
Yamaha
yz 125 problem
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