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  #1 (permalink)  
Old 04-30-2021, 11:02 AM
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Grinding when accelerating

Hey everyone, I just picked up a chopper that has a Revtech 100" engine with an Ultima Transmission and open primary. Bike starts and runs and rides great, until it has been riding for a couple minutes.... after it is warmed up and i've ridden a couple minutes it will make a lound intermittent grinding noise while accelerating (even with the clutch pulled in). Sounds like it may be coming from the transmission, but can't be sure. Any idea how to diagnose?
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Old 04-30-2021, 12:31 PM
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What year? I know several years were bad for the trans/motors they made.

I would recommend taking it to a mechanic to have him ride and give a listen to. if your mechanically inclined you can check the trans, it might also be your primary. Are you running a closed or open primary?
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Old 04-30-2021, 02:13 PM
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What year? I know several years were bad for the trans/motors they made.

I would recommend taking it to a mechanic to have him ride and give a listen to. if your mechanically inclined you can check the trans, it might also be your primary. Are you running a closed or open primary?
Not sure on the motor year, the transmission and primary are both Ultima, not Revtech. It is an open primary.
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Old 05-08-2021, 03:21 AM
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You need to locate, isolate the noise. Cyclic noise could be any of the rotating entities- wheels, trany, engine.

Does the noise follow the acceleration of the wheels in a linear fashion or it seems to follow the pattern of the engine revs? ( like pulling the clutch in in high speed might reduce the noise if engine was making it )
After the bike warmed up and you start hearing the noise, fix the bike on a stand with he lifted rear wheel, try to reproduce manually the noise- rotate the wheel in neutral, rotate the wheel in all gears with the primary belt off. Rotate the engine by the front pulley and listen.
Rotate the front wheel as well. Wheel bearings?
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