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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Cylinder Valves
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[QUOTE="terry hay, post: 688764, member: 48273"] Back in 98 when the cylinder valve was first introduced we found ourselves addressing the problems associated with the valve by reducing the base valve shimming to promote a plusher ride and increasing the stiffness of the midvalve to assist with bottoming. We found this worked rather effectively at the time. Problem was, midvalve shims and cylinder valve shims don't appear to have the greatest durability. Our original setup began to be less adequate as the shims began to fatigue. Obviously we could simply replace the shims on a regular basis to maintain consistancy but that would rely on having customers with a religious service ethic. Does such an animal exsist? We had to find a better way. Jeremy has clearly delved deeper into the concept behind the valve than I have. I guess we look at things differently. I tend to ask, "Does it work?" If not, why not, and how can we fix it. If it does work, how can I improve it. He clearly analises to a far greater degree. As for the cylinder valve itself, we have seen it stiffened up from the original example yet we still get the same complaints. Feels harsh. Bottoms easily! To answer bclapham; When you replace the valve you can lighten the shimstack dramatically. For instance, for a guy your size I could replace all the tapering shims with 0.1s and maintain only 3 of the 24x0.15s. This stack is is only indicative of the reduction in stiffness and by no means a recommendation. [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Cylinder Valves
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