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Cylinder Valves
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[QUOTE="terry hay, post: 689119, member: 48273"] Jeremy BCs bike is a 2001 which came out before the revamped midvalve pistons. I understand what you are saying about the improved durability. Yamaha increased the cross sectional area of the ports thereby distributing the load over a larger area, reducing deflection and and increasing longevity. Hmmmm, High flow, high efficiency pistons. Why hasn't someone thought of that before? I applaud your faith in technology over time but when a guy brings his bike in for a performance upgrade he generally wants results straight away. Given the problems associated with the CV from the start it was hard to see it as a giant leap forward. After 2000 when the YZs came out with an alloy damper rod and stiction became an issue. We began looking to get rid of the CV completely. Since then we have never looked back. Granted Yamaha may be closer to the mark and someday may perfect the system. But at least we stuck it out for three years which is two more than Kawasaki and one more than Honda. [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Cylinder Valves
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