Clutch Drag

rvich said:

While I had the primary apart I inspected the clutch plates and cleaned everything up. The metal plates in in pretty good shape but by marking the sides with a felt tip pen and then rubbing them on fine sandpaper I was able to determine they are not completely true. I decided to run them for a while and see how the clutch felt.

Now that I have the bike out tearing up the road the clutch feels good but when everything is good and warm I can put the bike on the stand and the rear wheel will rotate from the clutch dragging. If I grab the wheel with my hand there is no real pull there. How normal is this? Am I expecting too much out of a mutli-plate clutch to think there wouldn't be some rubbing going on in there when in neutral? Trying to adjust this out has gone too far the other way in a hurry.

I am also running the black fiber plates with what looks to be aluminum for centers.

Thanks,
Russ

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cash said:

I reckon the drag causing the rear wheel to spin is the friction between the main shaft and and sleeve gear bushes, and is quite normal.

Cash

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swooshdave said:

Isn't it just drag from the oil on the plates?

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L.A.B. said:

swooshdave said:

Isn't it just drag from the oil on the plates?

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It can also happen if the gearbox is in neutral with the clutch lever released, especially if the gearbox oil is cold and thick, in which case, it won't be clutch drag making the rear wheel rotate-as with the lever released the clutch plates are fully engaged, so must be either friction or "oil drag" from the gearbox.

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