Modern Vespa

I have an noisy bearing on my mp3 its the toothed pulley between the variator and the clutch
Part 833989
Anyone cleaver guys on here know the size of the bearing so I can replace.

Thanks

Just get the original Piaggio part.

AF1 racing lists it at only $23, although currently out of stock.

https://www.af1racing.com/833989-OEM-Piaggio-Vespa-Pulley---833989-ex-AP8580199

It's probably not that bearing making the noise. You also can't replace that bearing, it won't come out of the idler wheel. You just replace the idler wheel. The bearing is moulded into the wheel.
The idler wheel doesn't spin much, it just occasionally gets brushed by the belt when you slam the throttle shut and when at idle.

The idler pulley bearing can be replaced very easily if you have a press The part number is timken 6301 - 2 RS.
Just replace mine in the fall.

Thanks for the replies.
That part the uk in over 50 uk pounds.
So would prefer to change the bearing.

You could try running the bike (briefly) without the pulley to confirm if it was this making the noise. Save you some money and hassle.

if you want to change the bvearing find the idlepully from a x9 500 or old atlantic 500

that one is allumium and there you can changes them

That's about the going rate everywhere that has them in stock. I have no idea why a plastic wheel with a bearing in it is so expensive. And Piaggio sells the bolt that attaches the part to the crankcase in bags of ten, so apparently they do get replaced or serviced quite often.

Allumium???

Is that the fabled rare alloy made from a blend of aluminum and titanium???