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Old 07-03-2010, 09:57 PM   #1
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Popping noise from rear. New bearings, sprockets, chain.

A little over a month ago I noticed a popping noise coming from the rear axle/swingarm after riding in the rain, figured it was a good time to replace the rear wheel bearings, the chain and upgrade my sprockets. After I replaced all that everything seemed to be okay. Today when I'm rolling the bike out of the garage the noise started up again. It's a metallic poppng sound, gets quieter and faster the faster the bike rolls, and I have to roll the bike about a foot before it starts to make the sound. It doesn't happen at a specific point in the wheel rotation either. I can feel it in the swingarm too. I had rode through some wet weather recently so I lubed up the chain a little bit, noise still there. What could be causing the noise, even after new bearings, sprockets and a chain?
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Old 07-03-2010, 10:38 PM   #2
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hmm. almost sounds like a tight spot in chain, what area are you located around?

yes i know u said u put a new chain on but the master link could of been installed too tight.... (still salvageable if so) just have to get a new master link and replace that one. bring it by Motorcycles Unlimited or if your by me ill take a look at it for u....
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Old 07-03-2010, 11:05 PM   #3
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How tight I your chain? Feel the slack at every point of rotation by Rollin it back an inch or so at a time and grabbin it. It may be too tight , all chains have a tight part and loose part, definitely sounds like a chain issue if bearing s are new
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Old 07-04-2010, 09:46 AM   #4
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Quote:
Originally Posted by camaroz2866 View Post
hmm. almost sounds like a tight spot in chain, what area are you located around?

yes i know u said u put a new chain on but the master link could of been installed too tight.... (still salvageable if so) just have to get a new master link and replace that one. bring it by Motorcycles Unlimited or if your by me ill take a look at it for u....
What part of town are you at?
I've been to Motorcycles Unlimited before but it's a bit of a ways for me to go, especially with the problem I'm having. I'm in SW Houston, near 59 and beltway 8.
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Old 07-04-2010, 09:48 AM   #5
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Originally Posted by TomballD View Post
How tight I your chain? Feel the slack at every point of rotation by Rollin it back an inch or so at a time and grabbin it. It may be too tight , all chains have a tight part and loose part, definitely sounds like a chain issue if bearing s are new
Well the old chain had noticeable tight and loose parts, and I could feel it "clicking" above 30 mph or so, so that's why I replaced it along with the sprockets. The bearing in the sprocket hub assembly wasn't turning as freely as it should so I went ahead and replaced all three.
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Old 07-04-2010, 09:50 AM   #6
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put your bike up on a rear stand and spin the tire and watch/listen.
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Old 07-04-2010, 10:34 AM   #7
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put your bike up on a rear stand and spin the tire and watch/listen.
Well before the noise wouldn't stop until I loosened up the rear axle, putting it up on a stand didn't do anything. Tomorrow I will try to grease up the swingarm pivot point and maybe loosen up the chain a little bit. Now as far as setting the chain tension, take a look at this thread and see what you think.
http://www.motohouston.com/forums/sh...04#post2575704
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Old 07-04-2010, 10:49 AM   #8
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well, how heavy are you and how far does your suspension sag while your on it? if you set the chain on the kinda tight side and you have a soft suspension and your heavy, your slack will go away and your chain will be tight. BUT... a tight chain still shouldn't pop. I think you have a tight link somewhere. just cause everything is new doesn't mean it's perfect. personally, i would loosen the chain up and spin the wheel and look for ANY hint of binding, cause with that small of a front sprocket a slight bind will be magnified.
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Old 07-04-2010, 10:53 AM   #9
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Seems a little much to me. I usually put 3/4" - 1.2" slack in mine. If you went with a 13 tooth on the front, that is tiny. That might be part of the issue...chain might not have enough sprocket to go around smoothly (that's just a guess). Also, make sure the chain is aligned properly. Is the wheel straight? How did you measure that? I use a "chain alignment tool". I don't trust the lines on the swingarm.
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Old 07-04-2010, 11:14 AM   #10
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Quote:
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don't trust the lines on the swingarm.

very true. I always used a micrometer to set mine
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Old 07-04-2010, 11:55 AM   #11
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13 T is a small diameter sprocket and is on chains.

Put it on a rear stand and slowly rotate the wheel while checking chain tension. You should have 1" - 1.25" of play at all points.
Also check to make sure the chain isn't rubbing the chain guide / top of the swingarm towards the front of the swingarm.
It 13T narrows the chain angle a lot and can allow the chain to grind into the swingarm.

If you're still having issues give me a shout Tuesday and I can walk you through a few more things to check.
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Old 07-04-2010, 08:23 PM   #12
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I didn't tighten down the tensioners enough after torquing down the axle. Axle moved back a little bit. Thanks for the help guys.
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Old 07-04-2010, 10:39 PM   #13
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Well I just rode about 10 miles mostly on the freeway, bike started getting squirelly and the noise came back. Turned around and rode it home, chain had loosened about half an inch. Time for new tensioners maybe? Axle was torqued to spec (83 ft/lbs), cotter pin installed, tensioner bolts tightened after tightening the axle. I was able to tighten them about a full turn, maybe one more than the other. Time for new tensioners?
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Old 07-05-2010, 12:46 AM   #14
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Weird. Once you set your axle, the tensioners job is greatly reduced. Maybe you need a new torque wrench.
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Old 07-05-2010, 12:48 AM   #15
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Also, do a search on YouTube on properly tensioning a chain. There is a good one that has a rc51 being done.
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Old 07-05-2010, 11:38 AM   #16
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If the bearings werent set properly in the wheel, once the complete torque is done for the axle bolt the wheel could still be loose in the track arm and allowed to move. Tensioners will allow backwards movement but not forward movement by design.

Accelerating would force the rear tire to the front of the trackarm; where as braking would cause the tire to push backwards in the trailing arm.
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Old 07-09-2010, 01:58 PM   #17
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I'm having the same problem, mine pops/clacks till 25 mph and it stops, but I've noticed my chain loosens really fast, idk wat the problem is,
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Old 07-09-2010, 02:24 PM   #18
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The popping noise coming from your rear is quite common. Having you been eating spicy food or a lot of dairy?
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Old 07-09-2010, 10:38 PM   #19
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I'm having the same problem, mine pops/clacks till 25 mph and it stops, but I've noticed my chain loosens really fast, idk wat the problem is,
Patrick recommended to me that I should make a mark on the axle once the tension is set and axle torqued down so I can see if it's the axle that's moving.
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