It *is* shown in the parts list - but unrecognisably! Described as "oil seal x9 125 evolution", it's shown in the wrong position, and not to scale. T-1-08, item 6.
I have a high pitched whine coming from the left side on acceleration. It stops when I back off the throttle. Above 50, it either stops or I can't hear it over the engine noise.
Through searching the forum I've found some possible causes: Intake air leak, dampening ring, bearing on belt pulley or low gear oil.
Gear oil is fresh and at the bottom mark of the dipstick. I looked over every inch of the intake and see no cracks, holes or problems.
Scooter has new Piaggio belt and Dr. Pulley sliders. I also replace the clutch bearing in the CVT cover.
I'll pull the variator and replace the ring and belt pulley bearing since these parts are cheap enough.
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