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FJR Motorcycle Forums
Technical & Mechanical Problems
Fork suspension tuning
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<blockquote data-quote="Fred W" data-source="post: 1412847" data-attributes="member: 3828"><p>Unless you changed the damping valves, IOW if you still have the stock valving, the 7.5W fork oil will be too heavy no matter what spring you have in there. The stock Yamaha fork oil is a very light viscosity oil. Approximately a 3 weight oil compared to most others. I have been using Motul Extra Light as a close approximation of the Yamaha oil, which is harder to find.</p><p></p><p>Heavier oil will not only increase the baseline low speed damping, which might be beneficial (and is the part that is adjustable with the clickers) it will also increase your high speed damping that is of fixed value set by the shim stacks in the valves. I dont think youre going to be happy with the way it works with that in there.</p><p></p><p>The damping adjusters are just screws adjusting a needle valve. Fully CW is all the way seated. Thats why you always count clicks out from fully CW. That will open the needle valves the same amount. Where the fully open mechanical stops are may vary, but dont matter.</p><p></p><p>The only thing the fork preload does is establish the front ride height. It doesnt change how stiff the fork is. That is a function of the fork springs, damping and air space above the oil. If you can achieve the desired ride height then your preload is OK.</p><p></p><p>Hope that helps</p></blockquote><p></p>
[QUOTE="Fred W, post: 1412847, member: 3828"] Unless you changed the damping valves, IOW if you still have the stock valving, the 7.5W fork oil will be too heavy no matter what spring you have in there. The stock Yamaha fork oil is a very light viscosity oil. Approximately a 3 weight oil compared to most others. I have been using Motul Extra Light as a close approximation of the Yamaha oil, which is harder to find. Heavier oil will not only increase the baseline low speed damping, which might be beneficial (and is the part that is adjustable with the clickers) it will also increase your high speed damping that is of fixed value set by the shim stacks in the valves. I dont think youre going to be happy with the way it works with that in there. The damping adjusters are just screws adjusting a needle valve. Fully CW is all the way seated. Thats why you always count clicks out from fully CW. That will open the needle valves the same amount. Where the fully open mechanical stops are may vary, but dont matter. The only thing the fork preload does is establish the front ride height. It doesnt change how stiff the fork is. That is a function of the fork springs, damping and air space above the oil. If you can achieve the desired ride height then your preload is OK. Hope that helps [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
Fork suspension tuning
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