Fazer 600 02 sprocket nut/thread

[darrsi]

[quote author=darrsi link=topic=26293.msg317038#msg317038 date=1593336044]
You must take into account that the link Gnasher has put up is from 2011 when the issue was properly being addressed full on, but also that you're the first person in quite a few years now that have brought this problem up on here.

After pages and pages of discussions, some got the shaft replaced (courtesy of Yamaha), others used extra strong Loctite, spot welds, etc.

But although still not perfect by any means, because it was primarily a shaft thread issue, the main thing that calmed down more reports of it happening had to be the replacing of the OEM 9mm sprocket nut with the newer 12mm one.

Obviously that doesn't apply to 100% of bikes by any means. It would seem that at least the 98 (maybe 99) versions were unaffected, and others simply haven't had the issue at all.
On my bike the 9mm nut fused itself onto the shaft, rather than come loose, so was a complete bugger to get off when i had my sprockets and chain changed.

My point though is that i wouldn't let it put you off buying another Fazer by any means. You've been very unlucky admittedly, but it really is rare to hear of that nut/shaft failure on here these days. As long as that new 12mm nut is used then it seems to have done the trick.  :thumbup

Many bikes got away with not being effected until they replaced their chain/sprocket.  Nearly all bikes effected with OE chain/sprockets, just came loose, or if not noticed, undone and the sprocket cover stopped the nut coming off, but the longer you didn't hear/notice the lose nut the more damage to the thread. Eventually the cover would wear and the nut dropped off, possibly taking the sprocket with it  :eek  98 & 99 are effected mine was/is a 98, mine just came loose.  Most could be sorted by as you say loctite and you only need nut lock but this had to be before the threads destroyed themselves. 

I wouldn't recommend spot welding other than for emergency and you intended to replace the shaft, but you can and grid off the spots each time you change the sprocket.  The latter can be false economy, if the threads are worn too much and you can't nip up the sprocket properly before welding, there's a high risk the sprocket won't be aligned to the shaft and rear sprocket and will eat the chain in short order.

The new nut works fine if the thread is in spec, if not it's a new shaft.






 
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That's interesting that your 98 suffered, as that was one of Fazersharps goals to try and find one that was affected and I don't recall anyone mentioning it on here before either.


You were probably part of the discussions anyway, it's been a while, but what were your views on the new torque setting with the 12mm nut?


9mm was 70Nm, and it was recommended the 12mm had 90Nm.
I was one of many who were a bit wary of this because of the thread and plumped for 80Nm which I've stuck with and it's been fine.