Sherco Specialists

[geebee]

Gentlemen

Has anyone experienced this problem and found a solution.

Having changed the clutch basket on my 07 2.9 Sherco, a recent strip down revealed that the rivet heads have been rubbing on something. On close examination I think they have been machined by the end of the gearbox mainshaft which carries the starting mechanism idle gear.

I have changed the bush (inner race) for the needle roller bearing and the bearing, but not the outer race, which is part of the primary drive gear.

This engine, since I have had it has always been noisey and I am still trying to reduce the noise.

Any help or comments on this problem would be appreciated.

Geebee

[copemech]

I have not had one apart in quite a while,but you would want to insure the M203 spacer and M208 are not reversed in order.

Also be sure the shim washers on the idler gear are in proper position. I cannot recall if the M153 idler gear has an offset that could be reversed?

M2C

[geebee]

Thanks for your response Copemech

This was my assembly procedure:

The spacer in as per diagram, that is with flange towards gearbox.

The needle bearing slid onto the spacer.

The clutch basket / primary drive gear assembly slid onto the bearing.

The bearing retaining washer fitted.

The clutch hub then installed and bolted up.

It was noted that there was some lateral movement of the clutch basketafter assembly.

I am considering fitting a shim on the spacer to compensate for this movement and to hold the basket outboard and was hoping some one had previously done this modification.

Regarding the idle gear, this has not been remove and is as assembled by the factory.

Geebee

[copemech]

Well it does sound as though things are in correct order.

One thing I am unsure of is the type of noise you were attempting to fix in the first place?

Other thing that comes to mind regarding lateral movement in the entire clutch assembly. Obviously there well might be some, yet I would not think much. It would be fairly easy to compare, I think, by removing the outer cover only on another bike.

If excesive, would that not relate back to the input shaft bearing in the case that supports the entire clutch assembly?

My guess is it could create a whining or whirring noise as the primary gears would not quite mesh correctly? Sound something like a Scorpa 2T?

[geebee]

Hi Copemech

I think I tend to agree with you.

I am making plans to change all gear box bearings at the earliest opportunity.

I was going to change main bearings also, but those plastic cadged bearings (TNPs) are so expensive.

May actually fit standard 6206 C3s.

Thanks for your help

Regards

Geebee