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Post by stergavbry69 on Jun 1, 2019 7:24:00 GMT -5
Hey all. Before I tear into this I’d like some other opinions. Sounds like a Jetsons car and won’t reach 30mph. Gearbox bearings on the way out? youtu.be/mQRX-9dIIxA
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Post by fuzzyruttin on Jun 1, 2019 8:50:11 GMT -5
Perhaps, but if you keep riding, prepare for spontaneous unexpected lockup. That happened to me about a month ago, although there was no such noise (that I noticed anyway) before the clutch bearing seized. Gearbox oil full? Take off the CVT cover to inspect the variator, belt, clutch and go from there.
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Post by GrumpyUnk on Jun 2, 2019 12:14:34 GMT -5
Get the thing up on the center stand. Sit on the ground next to the CVT, rotate the rear wheel by hand. If the rotation feels 'rough' in any way, you have alternate choices to check. You can drain the gearcase using the bolt that comes in from the bottom. Catch the lube in a clear glass container so you can see the fluid. Let it drain for a while. Replace and fill with proper lube. Wait a while, and see if there is any filings or chips that settle to the bottom. A magnet would collect a good sample if any are present. If the gears feel smooth, and there is no 'bearing roughness' then you may have a CVT/clutch problem. Remove the side case, inspect the belt, variator and clutch. Spin the clutch bell. It should spin freely, and will rotate the gears in the gearbox along with the wheel. You should feel no rough spots, nor any spots where it is hard to turn. IOW, it should turn smoothly throughout multiple clutch bell revolutions. You'll have to go about 12X to insure you have gone through full rotation of the geartrain. Gears can have wear that causes whine, bearings can have rough spots that will feel as if someone put some dirt into the ball bearing race. The gear wear can go a long time before failure, if at all. The bearings will fail. You do not wnat to be riding when bearings fail as they can lock up. The gears will get LOUD before they fail. Several vendors sell gears, some in US, some in China. Some also sell a full set of bearings. Fastenal company sells bearings at reasonable prices. If you order from them, they will ship to the closest store at minimal charge, like 60 cents for front axle bearings for an ATM50-A1. Total cost was less than $5 for front axle bearings. You'll have to remove the old bearings from the case, but can find measurements online and order prior to disassembly. I had an input shaft bearing (clutch bell shaft) completely fail(before I bought) and that was difficult to remove as there was nothing to grab onto. I used melted wax to slam the 'closed' bearings out. Find out what is making the noise and decide a course of action before something makes a decision for you. tom
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