And fork oil also tends to contain higher percentages of molybdenum disulfide and anti-foaming agents than engine or gear oil, both of which are very important to proper fork operation.
As a small example A very necessary and useful feature for an engine, where you do not want your oil thinning out as the engine warms up. Not such a good idea for your suspensionunless for some reason you WANT your handling characteristics to change get stiffer as the forks heat up! Proper fork oil levels and scheduled change intervals are important for fork performance and fork part longevity Yamaha recommends a fork fluid change every , miles or every 2 years.
If you just bought a used bike, we recommend you do a fluid change as soon as possible, because just like other routine maintenance tasks besides engine oil changes , this is one that has very likely been ignored for the last years! Fork oil capacities and recommended weights are as follows. The amounts listed are per fork tube: XJ Maxim: cc or 9. XJ Seca: cc or 7. Fork oil level is specified as mm Fork oil level is specified as mm 7. NOTE: owner's manual states that the fork oil capacity is cc 9.
It is unknown which measurement is correct. Fork oil level is specified as mm 6. Fork oil level is specified as mm 8. The use of aftermarket performance front fork coil springs will change those volumes , since aftermarket springs are thicker than stockand thus displace more oil. Unlike with your engine oil, where a bit too much or too little oil volume in the crankcase is not really a significant concern, with fork oil, too much or too little can cause real problems too much oil can result in blown oil seals and a stiff, harsh ride, while too little oil volume results in excessive foaming, a soft mushy ride with possible bottoming, and erratic fork performance and lots of front end "dive" upon braking.
A better way to determine the amount of fork oil that is needed and necessary is via the measurement of the fork oil LEVEL within the tubes Yamaha does not specify this level for all models; and in any case, if using aftemarket springs, the factory oil level recommendation is not always useful. In order to be as accurate as possible, we recommend the use of a suitable measuring device, such as the HCP oil level syringe listed further below. And finally, the fork oil viscosity can be changed from the factory recommendations to give a softer or firmer ride In this regard, you would certainly be correct in thinking of fork oil as a suspension "tuning tool"!
Note that a thicker oil viscosity will have much more effect on the fork "rebound" characteristics than it will on the fork compression dampening function. Warrick Bell likes this. Place a drain pan under the fork legs and remove the drain plugs, one side at a time. If you prefer quick rebounds, use a lighter fluid. If you like slower rebounds, use a heavier fluid.
Also this oil works for single viscosity oil such as 10W , not engine oil such as 10W40 mixed with 15W Most suspension fluids that are lighter than 5wt are designed specifically to be used in a shock. Fork oils heavier than 5wt get too thin when they get hot. Stick with 5wt fork oil. The oil serves a couple of purposes in your forks. It provides lubrication for the sliding parts, keeping them from wearing metal to metal. The oil also provides your damping. The viscosity of the oil will break down over time and produce less damping action and needs to be replaced because of this.
The oil in your fork loses lubricity, gets dirty, and should be changed every 10, miles or once a year. Even if you regularly clean the seals, they wear out eventually and leak no matter what you do to keep a tight seal. Begin typing your search term above and press enter to search. Press ESC to cancel. Skip to content Home Physics How much oil do motorcycle forks hold? Ben Davis March 30, How much oil do motorcycle forks hold? How much oil does Ceriani forks take? How much oil does WordPress forks take?
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