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Front sprockett question
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07-09-13, 09:17 PM
Whilst out riding, the front sprocket securing nut came off and damaged the splines and threads. Has this problem happened to anybody else and how did you solve it please? Also, where is the best source for replacements parts?
Thanks, Sue 
07-09-13, 09:46 PM
Common problem with this model, unfortunately it was preventative by replacing the standard 9mm nut for the updated 12mm one.
I don't have the product number to hand but it is on many posts on this forum. Hopefully if the drive shaft thread isn't overly damaged the new nut could help cut the thread, if not you're looking at welding the nut/ sprocket onto the shaft which can only be done a couple of times before its a case of replacing the drive shaft!
Some say...
07-09-13, 09:50 PM
07-09-13, 10:04 PM
£5.93 from wemoto but only £2 something from yam. Dealer! :eek
What else does wemoto overcharge for?
Some say...
07-09-13, 10:09 PM
Hi Sue, gutted to hear your story!  , it is such a common topic on this site & unfortunately all those that arent members of Foc-u rarely know about the issue until it is too late.as discussed by the others, hopefully the shaft isnt beyond purpose & the updated nut goes on ok but personally if theres a small glimmer of hope of this being the case i would take the bike to a well trusted garage or engineering outfit along with the new nut just to make sure otherwise trying to bodge it on yourself may not work. Stick around on the site, it's a great place, keep us updated on your progress. cheers fras 8)
Easiest way to go fast........don't buy a blue bike
07-09-13, 10:34 PM
when you say 12mm instead of 9mm I take it to be the thickness of the nut?
mine is probably the original so best get to dealer to make change. is the front sprocket simple to get to?
Women have chocolate men have bikes.....
including ones who like chocolate.... 
07-09-13, 10:35 PM
(07-09-13, 09:17 PM)SueScott1 link Wrote: Whilst out riding, the front sprocket securing nut came off and damaged the splines and threads. Has this problem happened to anybody else and how did you solve it please? Also, where is the best source for replacements parts?Take a look here http://foc-u.co.uk/index.php?action=down...ew;down=43 and here http://foc-u.co.uk/index.php/topic,4546.0.html 
07-09-13, 10:51 PM
is the front sprocket simple to get to?
Yup, just whip the sprocket cover off! 
07-09-13, 10:55 PM
yes it happened to mine, a FZ6, got a new nut but the thread had worn, so just nipped it then had it welded, it wont come off now, lol, could grind it off when it needs a new sprocket, hope to get 25,000 miles out of the new set I put on, and maybe re weld one more on by then the bike will have done 75k, and I'll have hung up my riding boots?
07-09-13, 10:57 PM
cool, cheers jon, wasn't sure if it was the whole side case with gear lever removal necessary.
Women have chocolate men have bikes.....
including ones who like chocolate....
07-09-13, 10:59 PM
has anyone ever tried using loctite?
Women have chocolate men have bikes.....
including ones who like chocolate....
07-09-13, 11:01 PM
07-09-13, 11:07 PM
Women have chocolate men have bikes.....
including ones who like chocolate....
09-09-13, 12:54 PM
Sorry to drag this on but just called yamaha dealer regards getting the replacement nut for mine. when they said it would have to be ordered in I made point of ensuring it was the upgraded larger nut. I was then passed to the technician who told me they stock an upgraded lock washer to use with the original nut (if undamaged) and to clean shaft and apply loctite.
Any thoughts........is the technician to be trusted.........is anyone to be trusted these days lol
Women have chocolate men have bikes.....
including ones who like chocolate....
09-09-13, 01:20 PM
do what everyone else on here will tell you....12mm nut clean threads well use loctite ,torque to 90nm (think thats the new setting)... :rolleyes
09-09-13, 01:30 PM
hi sue...depends on the extent of the damage...ive just repaired one which was damaged on the end,i removed the sprocket and started the bike up in gear and used a fine file and put a bevel on the end of the shaft....then eased the nut on with plenty of grease at bit at a time,1 turn on,3/4 turn off etc... removing the nut every now and again to clean and re-grease........dont forget your risk assesement :rolleyes
One, is never going to be enough.....
09-09-13, 03:28 PM
I've always found a little fine valve cutting paste good for cleaning/repairing threads using the turn on turn off method suggested by Red
Women have chocolate men have bikes.....
including ones who like chocolate....
09-09-13, 04:26 PM
(09-09-13, 03:28 PM)midden link Wrote: I've always found a little fine valve cutting paste good for cleaning/repairing threads using the turn on turn off method suggested by Red top tip MIDDEN......if theres any pipefitters out there a drop of cutting fluid will also help
One, is never going to be enough.....
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