thicker sprocket nut worth a check

[tommyardin]

[quote author=tommyardin link=topic=21736.msg250990#msg250990 date=1485618902]
[size=1em]I have heard that some folk are only tightening the nut up to 75Nm to 80Nm, Yamaha are recommending 90Nm with the new 12mm nut, and fit a new tab washer at the same time.
Yamaha are also recommending the use of Loctite, ensuring the new nut and the thread on the output shaft are thoroughly cleaned before applying Loctite and tightening up to 90Nm.
Bending the tab washer over 2 of the 12mm nut flats
The original torque was 70 Nm with the 9mm nut, and guys are worried that 90Nm will strip their output shaft threads.

I did not have Loctite but mine went up to the recommended 90Nm and I used nail varnish on the nut and thread in place of Loctite.

Have you ever tried to unscrew the top of a nail varnish bottle for the Mrs or G/F when it had nail varnish left on the thread of the bottle top, it's often pliers on the top and smashing the top to bits in the process.[/size]

[size=1em]

I'm guessing if you go your own way with your own ideas when it comes to tightening the nut up there really is no come back, but saying that I used nail varnish/polish not Loctite, so be it on my own head. [/size]

[size=1em]Quick edit:[/size]
[size=1em]Ensure that the cut outs on the tab washer are pushed right into the clean splines of the output shaft if they are not the tab washer can spin with the nut and not be lined up with the splines then the tab washer will do absolutely nothing.[/size]

[size=1em]It's best to remove the front sprocket and clean thoroughly behind the sprocket and the sprocket itself otherwise you might just be tightening up on shit, and not have a face to face metal to metal contact to torque up to.[/size]

all good advice what i would say is it couldnt have torqued properly and the lock washer couldnt have been on right to cause it to come off
[/quote]




Daviee when you retrieved the Tab Washer after it had come off, were the sides still bent up in the locked position? if they were then I think the washer was never located properly.