SWEDE
New member
My primary clutch has small grooves on each face just about where the belt sits at idle.Other than that the clutch sheaves look great.These grooves have been there for a while and don't appear to be getting worse very fast.Is this something I should be concerned about?
The grooves are pretty normal on higher mileage Yamaha primaries and are a unfortunate downside of the durability of the hard compound OEM Yamaha belts we use. High engagement accelerates this condition. As long as the clutches are engaging and upshifting normally I would not worry about it but it will eventually lead to the requirement for a new ckutch.
JM.02c
Bob
JM.02c
Bob
SWEDE
New member
Ok, good to know, the clutch seems to operate fine.This sled has nearly 12,000 miles on it and I noticed this grooving when the sled only had a couple thousand miles on it.About the same time I switched to an Ultimax 3 drive belt which I believe is quite a bit softer and the grooving really hasn't got much worse even after all these miles.I believe it is time for a full service with springs,bushing, ect. replaced thanks, you help is appreciated!