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+--- Thread: Front sprocket Nut again - Sorry (/showthread.php?tid=58452)
Front sprocket Nut again - Sorry - Skippernick - 30-04-12
Just cleaned and inspected my front sprocket, a quick measure and it appears to be 9 mm or so thick, should it be 12mm??
Its locked on with a bendy washer thingy and has about 1-2 mm of spare thread showing.
Probably original chain and sprockets.
02 fzs600 by the way.
Cheers for the help.
Nick
Re: Front sprocket Nut again - Sorry - limax2 - 01-05-12
When your bike was made 9mm was the correct thickness of nut. In cases where there was a problem with it coming loose the Yamaha fix was to replace the nut with a 12mm thick nut. Also if the threads on the gearbox shaft where not as they should be, to replace the shaft.
When fitting a new sprocket it would seem prudent to fit the 12mm nut at the same time. Some folks chose to replace the 9mm nut with a 12mm nut just for peace of mind, (that's what I did), others consider this a bit over the top. Either way using the correct torque and thread lock as well as the locking washer is still important.
Re: Front sprocket Nut again - Sorry - limax2 - 01-05-12
To see the difference here is a drawing I did for the old site when this was a hot topic.
Re: Front sprocket Nut again - Sorry - Skippernick - 02-05-12
Limax2 thats a brilliant drawing thats exactly what i have. I got the bike with 6000 miles on it 2 years ago it now has 15,000 so obviously not a problem.
When i change the chain and sprockets i'll worry about it then, and in the mean time monitor it.
Thank you so much for replying.
Nick