Old / new design
1. could this wear have taken place since buying the bike (about 600miles ago.)
No, see below.
2. this bike has the retaining ring with 2 bolts and large splines on the shaft. my other teneres have small splines and a central bolt. are these later bikes where yamaha have changed the design becouse its crap?
It is not really crap, but more likely to become damaged with a loose or bad chain.
My wife's 55W lives happily with it already for 120 000 kms.
3. did the fact that the sprocket was too thin cause the splines to wear or is something else at work like the two sprockets being out of allignment?
No, loose chain, flapping chain etc. will cause this. Make sure the tensioner rolls are in place and in good order, chain not too loose etc
sorry long one i know, but dont want it to happen again.
ooh, also, when i come to replace the shaft, will the one with the small splines fit as it seems to be a better design?
Don't know. Afraid not, you should measure both and if the dimensions are identical they should be exchangeable.
Auke
|