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Post by KSR Moto on Mar 31, 2018 4:08:25 GMT -5
I have noticed that when my scooter is on a center stand and if I try to rotate the rear wheel back and forth there is some "slap" and with cvt cover off I can see that cutch bell starts to turn after the rear wheel is turned a few degrees, It wont move right away as I expected it to.
Could this be sign that my transmission gears are worn?
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Post by GrumpyUnk on Mar 31, 2018 11:34:43 GMT -5
T here is always some slack in gear trains. Inside the gearbox are at least three gear-to-gear interfaces. The input shaft from the clutch bell has a gear that mates with the intermediate shaft gear, which, in turn, mates with the output shaft gear. Add up the normal clearance allowed between gear teeth, multiply by three, and you get some slack. OTOH, IF the gears are noisy, they will not quiet down over time, and will get worse, slowly, until they decide it's time to fail. By then, the noise will announce you from afar as you approach.
Inside the gearbox are ball bearinss, two per shaft, a total of 6. They are 'splash lubed' as are the gear teeth. If there are chips and filings, they can get ground up and fed to the ball bearings, leading to failure. The bearings will likely also make noise when they are unhappy. Roaring and whine are two common descriptors.
If your gears are pretty quiet, and there's no bearing noise. then check how smooth you can operate the geartrain manually. Turn the bell, and feel if the shaft moves smoothly, and the gears rotate without a lot of effort, AND have no 'binding' spots. Binding indicates problems are afoot. Either gear chips, bearing separators or something may be getting into the ball bearing races, soon leading to failure. A tiny 'bad spot' in a ball bearing race forces the ball to deflect, causing a ripple effect leading to big failure from a tiny bit of of metal.
Drain the gear lube, check for 'burnt' smell, observe for flakes, and replace with 85w90(I think). I measure the amount required into a plastic container, up to a fill line determined by measuring water into the container and marking. I then use a syringe to slurp up some lube and inject it into the fill hole.
tom
tom
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