My belt primary drive has been prety much trouble free for the past 4 years or so, so thats a good few miles. The ball bearing race that lives between the inner and outer baskets have now worn very badly. Over the last month or so it has felt a bit jerky as I pulled off.
I spoke with Bob Newby who makes these clutches and he can refurbish the worn part for me. I recently bought a spare clutch from him so I can do a swap whilst he makes good my old clutch.
Heres my old clutch before taking it apart.
I did need a bit of extra space for my 30mm wide belt so I made an extra thick gasket from leather
Heres the alterations I had to make to the outer primary cover so that the clutch fits. I actualy didn't have to do much cutting out of my cover as it had been previously owned by someone who did scrambles, apparently scrambles riders often did this so they can swap the engine sprocket without having to takethe clutch out.
There are a few lines cut into the cover by the belt when I first fitted it. A thicker gasket fixed that.
I had to grind a small area around the back of chain inspection screw cap to make more room for the belt.
Heres my new clutch fitted onto my gearbox. The new cluch just slides on without any spacers behind it but does need one behind the clutch nut. The large thick nut in the picture is the spacer
All finished, all went back on fine. I fitted a new belt but the old one still looked fine. I'll keep it as a spare.
Here's a video showing the slack needed in the belt. Probably more then you'd think. But this gives the smoothest ride.https://youtu.be/6SiDgEQyXE4
Heres my worn old clutch.https://youtu.be/49L6x8kwNg4