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Yamaha MX & Off-Road Dirt Bikes
Rich, 250F questions
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[QUOTE="Cabot, post: 1309130, member: 79941"] That was an interesting read :cool: From what it sounds like it would be ideal to vary the IVC timing compared to RPMs, then the port size would be less important, Stronger Power throughout... :think: But Anyways.. Merge Racing makes a stiffer AP spring, so your Jimmy-rigged Orings don't fall off. [/QUOTE]
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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
Rich, 250F questions
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