24-01-12, 05:38 PM
This is all from memory, no-doubt someone will be along in a minute to correct these lies.....
There was a problem up to about 2003 (ie all FZS600s) with the output shaft possibly being the wrong size. Everyone was (at the time) entitled to go to any yamaha dealer and get it checked at Mr Yamaha's expense - that offer SHOULD still be valid, but good luck getting anyone to recognise your rights after 9 years .
The solution was to measure the O/D of the output shaft and if it was below a certain number (17.5mm IIRC) then fit a new (different) sprocket, nut and washer.
This never happened to me cos mine (2000 FZS) was smack on 17.5mm - as measured by me with the nut still in place.
You could start by asking the folks that changed your sprocket if they used a new nut.... if they did then it would have been the 'good' sort.
There was a problem up to about 2003 (ie all FZS600s) with the output shaft possibly being the wrong size. Everyone was (at the time) entitled to go to any yamaha dealer and get it checked at Mr Yamaha's expense - that offer SHOULD still be valid, but good luck getting anyone to recognise your rights after 9 years .
The solution was to measure the O/D of the output shaft and if it was below a certain number (17.5mm IIRC) then fit a new (different) sprocket, nut and washer.
This never happened to me cos mine (2000 FZS) was smack on 17.5mm - as measured by me with the nut still in place.
You could start by asking the folks that changed your sprocket if they used a new nut.... if they did then it would have been the 'good' sort.