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(edit) Loose front sprocket nut
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TNT
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(edit) Loose front sprocket nut - May 12, 2014, 07:09 PM

I got home from track today and my bike is jingling. I rocked it back and forth a bit and heard what sounds kind of like a washer or something metal bouncing around off of some other metal, but it sounds like it's coming from the front sprocket area or the rear shock - really hard to isolate. I'll be taking things apart this week. Any ideas where to start with the diagnostics?

Last edited by TNT; May 14, 2014 at 06:07 PM.. Reason: fixed title
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May 13, 2014, 09:34 AM

Pull the front sprocket cover off and check the sprocket nut. I've heard stories of these coming loose; and they will make a jiggling noise if loose on the output shaft.

Let us know what you find out.

(If you don't want to remove everything; as a test you could try putting tension on the chain while rocking the bike and see if the noise stops.)


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TNT
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May 13, 2014, 09:55 PM

Thanks for the heads up. I will check this tomorrow after work - it's crappy because I have to fix whatever it is in a few days. I will be out this weekend, not much time next week, and I want to hit TDs on the 23rd and 26th, but no way in heck I'm going out with a questionable setup.
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May 13, 2014, 10:24 PM

Front sprocket is held on by a lock tab washer... looks kinda like this:


I suppose it's possible that the tab broke off and is bouncing around in there.. taking the sprocket cover off only takes 30 secs, wouldn't be a bad place to start.

Did the bike run fine all day? What was the last work you did on it?
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TNT
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May 14, 2014, 05:40 PM

You guys are ace. Loose nut on the front sprocket. Jingling was the washer that I assume keeps spacing and allows free rotation. Really glad I decided to sit out the last session. Pics incoming. I have a few questions, and there is probably some more revealing of how mechanically inept I am.

Last edited by TNT; May 14, 2014 at 05:44 PM..
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May 14, 2014, 05:50 PM





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TNT
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May 14, 2014, 05:51 PM

So, questions:

1. Am I missing some locking device of which I should be aware? Or is this a torque-to-spec issue I probably screwed up? I'm going to the manual now, by the way...

2. Are those cuts in the threads supposed to be there? What are they for?


ETA:
from the 2008 R6 service manual:

Drive sprocket nut M20 (qty)1 85 Nm (8.5 mkg, 63 ftlb) note:Stake

so, what does "stake" mean, and what ought I to do? Looking at it, looks like the cuts are for crimping part of the nut - might not be the right terminology here, but I've not a clue what staking a nut means.

Last edited by TNT; May 14, 2014 at 06:02 PM..
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May 14, 2014, 06:00 PM

Who replaced your chain or chain and sprocket?

Regardless, the nut should be tightened to torque specs and checked regularly, especially if this is a track duty bike.

Our race bikes run w/o sprocket guards on the front so we can always see it and have the nut safety wired on so this doesn't happen. If it comes off when riding, it never ends well.


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May 14, 2014, 06:06 PM

That would be dummy-me that replaced the chain, did not replace the sprockets when I did it - old chain that came on the bike broke (have video of that if there's any interest. Now I'm trying to think about when i did it - I think I just ran the new chain on the guide to get it around the front sprocket and then popped in the master link and riveted it.

Generally a good idea to run without the plastic cover (assuming that's what you mean by "guard")?

Also, what would you consider prudent for trying to get this fixed up for making another TD on the 26th? I'm pretty busy between now and then, so may just run over to Jason if it's complicated. Definitely want to make sure I'm not a hazard to myself and others.

Last edited by TNT; May 14, 2014 at 06:13 PM..
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May 14, 2014, 06:56 PM

Use blue 242 loctite on clean threads and where those 2 flats are you should peen the part of the nut into them.


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May 15, 2014, 07:24 AM

Hollywood asked me to post a pic of how the front sprocket is safety wired...unfortunately I was running late this morning and took a pic of the wrong thing. Google images to the rescue! This will give you and idea of how it's done, I'll post up the correct pic tonight.
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May 15, 2014, 09:45 AM

Quote:
Originally Posted by dodge131 View Post
Use blue 242 loctite on clean threads and where those 2 flats are you should peen the part of the nut into them.
This. Torque nut to spec; then take a punch or screwdriver and tap the lip into the cuts.

(It looks like this was done once before on that nut, but either not properly or it was removed and not reset.)


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- Sold, Red 94' VS800 - Loud as F@*$
* R.I.P. Blue 06' SV650, murdered by DC!
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May 15, 2014, 07:27 PM

Here you go pics as promised. You can see that the sprocket nut is drillers and wired in 2 locations.
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May 15, 2014, 07:50 PM

For a track duty bike I would say the wire is better than punching the lip of the nut down. If you can't drill it yourself, any shop should be able to really quick


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TNT
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May 15, 2014, 08:24 PM

Thanks guys. I'll get it wired. From that pic, just wrap the wire through the sprocket? Looks pretty straightforward. Plan on the torque to spec and blue loctite as well. I'm going to run with the dust cover on because part of my fairing bolts into the cover, so I don't want to have to worry about it.
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