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Old 07-14-2014, 08:37 PM   #1
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07 gszr 600 front sprocket nut keeps backing itself out........HELP

I did a 520 conversion on my bike. When it was time to change the gearing up I noticed that the front keeps backing itself out. I can remove it with my hand. There is no bite at all. I kept the oem washer when I went to an aftermarket front sprocket. I place the front sprocket on the spline and then the washer over it. I hand tighten and lock the rear wheel with a breaker bar. Then I hit it with a torque wrench to 83 ft/lb. The nut doesnt turn at all and immediately clicks my torque wrench. After one outing I'm back to square one. The front sprocket nut is loose and the only thing stopping it from backing out is the speed sensor rotor and bolt. I never used loctite and my bike never had a washer that peens over the nut to lock it in place. The washer is as thick as two quarters stacked on top of each other. It is not possible to bend it forward. Any help would be greatly appreciated. Sorry if I missed any pertinent information. If I missed something just ask and Ill add it to the post. Thanks in advance.
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Old 07-14-2014, 09:14 PM   #2
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Get a new front nut and inspect shaft for rounded threads. Maybe check calibration on torque wrench too.
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Old 07-15-2014, 07:39 AM   #3
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I always impact that nut and use blue loctite
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Old 07-15-2014, 07:57 AM   #4
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Sounds like the nut is bottoming on the threads or splines. You may need a second washer to add thickness since your new sprocket is probably thinner than the stock sprocket was.
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Old 07-15-2014, 10:08 AM   #5
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Threads on the spline and nut look fine. With the washer its def. Not bottoming out. Without It the bottom of the nut bottoms out at the base of the splines. Then the aprocket will have like a 1/16 of play
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Old 07-15-2014, 10:10 AM   #6
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i'd make sure your torque wrench is accurate. also if you have any adapters/extensions along with whatever you are using to lock the rear wheel, those all can absorb your torque and throw it off also
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Old 07-15-2014, 10:16 AM   #7
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Tony. Would I really need the washer? Its super thick. It doesnt look like the nut is catching all the threads. The pic below is the nut threaded on by hand. Its not torqued down. When i hit it with the torque wrench it barely turns. It turns maybe a half an inch.Click image for larger version

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Old 07-15-2014, 10:16 AM   #8
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Quote:
Originally Posted by QUICKGIXX View Post
my bike never had a washer that peens over the nut to lock it in place.
Interesting. I'm pretty sure that's how it's retained on the '08 that's in my garage (not mine, so I can't remember exactly).
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Old 07-15-2014, 10:18 AM   #9
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I think thoze two wings on the end of the nut are the locking device. Im hearing that suzukis come with the locking nut.
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Old 07-15-2014, 10:30 AM   #10
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My Susukis had the spacer (thick washer) outside the sprocket against the nut
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Old 07-15-2014, 11:03 AM   #11
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That's the wrong washer.
That's your issue, the threads are not engaging the locking part of the nut.
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Old 07-15-2014, 11:14 AM   #12
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Thnx for the reply patrick. It's the washwr that was on there oem. Which washer would I need?
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Old 07-15-2014, 12:56 PM   #13
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If that's the OEM washer then something is wrong.
The nut should fit all the way on to the threads on the output shaft engaging the locking mechanism.
I know it's a race bike but if you can bring the bike by in a truck with the cover off I'll look at it, no charge.
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Old 07-15-2014, 01:16 PM   #14
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Thanks Patrick! This is my front sprocket. See the machined lip on the sprocket. Its identical in size to my oem washer. I think the washer is imcorporated into the sprocket. Explaining why when I stack the washer on top of that lip I cant get full bite on the output shaft. looks like I can go without the washer because my sprocket isn't flat. What do you think Patrick?
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Old 07-15-2014, 01:31 PM   #15
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That doesn't appear to be the correct sprocket.
With that offset I'd be concerned the chain wouldn't track properly.
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Old 07-15-2014, 01:43 PM   #16
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Hmmmmm. I ordered it for my bike. I have 2 sprockets, i ordered on two seperate occasions. They both look similiar. I guess it's possible that I got the wrong sprocket twice. :-(
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