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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
High Compression piston for a YZ250F
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[QUOTE="Rich Rohrich, post: 163591, member: 16241"] Jim - Running the correct squish clearance is pretty critical in these engines. Yamaha has tended to set the YZ and WR 4xx VERY loose. I haven't seen enough 250F to know if they have continued the trend, but given the elevated rpm peak and the intended audience it's logical that there would be a generous safety margin in most of these engines. At the very least the squish clearance should be checked. [/QUOTE]
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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
High Compression piston for a YZ250F
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