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Yamaha MX & Off-Road Dirt Bikes
Rich, 250F questions
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[QUOTE="Rich Rohrich, post: 1308557, member: 16241"] A bigger bore will increase the depression in the cylinder, which increases the "gulp" that the engine takes as the piston descends from TDC. This gets the air mass in the ports moving sooner, and gets it to max speed at a lower rpm. This can carry over as the piston changes direction at BDC and can in some cases allow you to use a later IVC timig. [/QUOTE]
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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
Rich, 250F questions
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