Knocking noise when rear wheel is turning - Wrist Twisters
 
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post #1 of 12 Old 03-26-2012, 04:13 PM Thread Starter
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Knocking noise when rear wheel is turning

So I noticed this low frequency knocking sound last year cruising @ 25 mph. That was near the end of the season. Now that it's closing in on riding season I'm looking to fix it. Bike has just over 4000 miles.

So far I've put the bike on the rear stand and confirmed that it makes the noise still. Even got a friend to validate my high NVH sensitive self that I'm not feeling/hearing things. It is very hard to pinpoint where it is coming from. Even with a stethescope.

So it's there I've done the following:
1. Changed gears with it. Frequency goes up the higher the gear. So it's not an engine noise.
2. Removed the rear caliper. Did nothing
3. Removed the front sprocket and ran it in all gears. No noise.
4. Put it in 1st gear and went from loose chain to tight chain. No change.
5. Checked run out on the axle. .002, within .010 spec.
6. Looked at and felt rear bearings. Seemed ok. Putting the wheel and drive flange on the axle and spinning it by hand showed no noise or rough spots.
7. Chain and sprockets look OK and I've been pretty consistent on lubing and tensioning the chain. But I'm kind of a newbie so maybe I goofed something up.



Rather than go drop money on a new chain/sprockets is there anything else I can check? I've thought of taking the chain off and rolling it down the hill next to the house to see if I get the noise. But then I have to push it back up the hill and I'm not sure that would tell me anymore than I already know.

Thanks in advance.

- Bryan
2004 Yamaha FJR 1300 ABS
2010 VW GTI DSG
1976 Datsun 280Z Turbo
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post #2 of 12 Old 03-26-2012, 04:40 PM
(Quintus) Pilus Prior
 
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From your description, you have eliminated all the possibilities other than a chain link binding up. I suspect that's the problem.

Well, fire the engines! Spur this iron space-pony on!

"The Shadow"
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post #3 of 12 Old 03-26-2012, 05:01 PM Thread Starter
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spot on - I removed the rear wheel and checked each link 1 by 1. Found 1 bad one. thanks!

and I have a track day in 2 weeks. sigh. at least I know what the problem is.

- Bryan
2004 Yamaha FJR 1300 ABS
2010 VW GTI DSG
1976 Datsun 280Z Turbo
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post #4 of 12 Old 03-26-2012, 05:04 PM
(Quintus) Pilus Prior
 
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...I've had that problem before, and it was tough to narrow it down...it's very frustrating, and makes you doubt yourself. Glad you were able to figure it out!

Well, fire the engines! Spur this iron space-pony on!

"The Shadow"
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post #5 of 12 Old 03-26-2012, 07:11 PM Thread Starter
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Silly question - is there any way to un-bind the link? The sprockets are in great condition and the rest of the chain is fine. Bike only has 4000 miles on it and the chain isn't the stock one. It is not the stock chain and I got the bike @ 1200 miles.

- Bryan
2004 Yamaha FJR 1300 ABS
2010 VW GTI DSG
1976 Datsun 280Z Turbo
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post #6 of 12 Old 03-26-2012, 08:33 PM
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Quote:
Originally Posted by speedprotege View Post
Silly question - is there any way to un-bind the link? The sprockets are in great condition and the rest of the chain is fine. Bike only has 4000 miles on it and the chain isn't the stock one. It is not the stock chain and I got the bike @ 1200 miles.
Is the one bad link the master?
I wonder if they messed that up.

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post #7 of 12 Old 03-27-2012, 09:58 AM Thread Starter
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I called a local parts place to see if they had another master link- I told them I had a 530 rk oring chain - they said they had a did master that would work.

Anybody switch brands on master links?

- Bryan
2004 Yamaha FJR 1300 ABS
2010 VW GTI DSG
1976 Datsun 280Z Turbo
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post #8 of 12 Old 03-27-2012, 11:05 AM
just send it.
 
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Are you going to cut the chain and put 2 master links in it?



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post #9 of 12 Old 03-28-2012, 05:52 AM Thread Starter
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That was the plan. But after alot of bending back and forth and cleaning the noise has gone away.

I got a rivet tool from a friend and will put some pressure on the rivet to see if that can loosen it up a bit more.

- Bryan
2004 Yamaha FJR 1300 ABS
2010 VW GTI DSG
1976 Datsun 280Z Turbo
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post #10 of 12 Old 03-28-2012, 06:13 AM
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Dude, just get a new chain!! Play it safe, especially if you are going to run it on the track.

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post #11 of 12 Old 03-28-2012, 06:29 AM Thread Starter
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I will ride it a bunch over the weekend and inspect on Sunday. If I don't feel it is safe I will get a new one.

Thanks for the input.

- Bryan
2004 Yamaha FJR 1300 ABS
2010 VW GTI DSG
1976 Datsun 280Z Turbo
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post #12 of 12 Old 03-28-2012, 11:00 AM
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Quote:
Originally Posted by Shmoo View Post
Dude, just get a new chain!! Play it safe, especially if you are going to run it on the track.
if it is just 1 link and was able to clean/lube/free it up. i say he's ok. if it was multiple links throughout the chain, then yes get a new one.

i wouldn't worry about it. worse thing it'll do is start binding up again and if it does, time for a new chain.

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