Front-Sprocket: The Right Size Of This One --.. Should I Take A Thick One Or The Thin One

[fixitsan]

I would measure the output shaft.

What is the current sprocket ? If it is narrow and fits very well then it's correct, but there were a few years of the 850 towards the end of the production where they switched over, and then switched back. (I had the same problem after fitting an early output shaft into a late gearbox.

 

The narrow one, when fitted correctly on the appropriate shaft with lock washer is a good snug fit. And it's the same when the wide one is fitted on the appropriate shaft.

 

I think I've seen reports of some people's output shaft getting worn by a 'loose sprocket' and that made me realise they may have fitted a narrow sprocket when the original one should be wide.

 2 different sources gave me different years for the cut in. I believe the wide one was standard upto about 96, then for two or three years they went to narrow, then switched back to wide (or that may be the other way around, it was a while ago)

 

I would order one of each and try the wide one first, with the correct washer, and if the nut torques up correctly with a few spare threads on the shaft, send the narrow one back for a refund.