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#878497 04/24/22 5:06 pm
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It doesn't always do this but today it is. When I wheel my 67 TR6R along (engine off) there is a loudish click/ clonk that seems to come from the back wheel.

If I put the bike on the centre stand and spin the back wheel it doesn't do it. It also is a bit random in frequency. What could this be?

The chainguard moves with the swinging arm so I discounted this.

Then I thought it was the speedo drive but why would it not do it on the stand? Then I wondered if the chain and sprockets were doing it but i let the chain run over my finger as I pushed and the click made no jolt to the chain.

Wheel bearings were good just a few weeks ago when I was working on the rear wheel.

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lol

a mystery.

i suggest that you loosen everything back there associated with the wheel, tighten it all back up, and see if the problem goes away. plus, you may discover something odd in the process.


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Not much to go on, but I would suspect the chain/rear sprocket.

Maybe one or both are worn, the chain is too tight, or the alignment of the wheel is off.

Does oiling the chain stop it happening?

Just guesses really.

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dave j Online Content OP
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I have to wheel the bike a few feet for it to click. Maybe it is every one revolution of the rear wheel I will check this. The chain is lubricated ok.

It is funny that it doesn't do it when spinning the wheel on the stand but does when pushing it along. The chain is not too tight. I will properly check the wheel alignment tomorrow but wouldn't this be the same on or off the stand?

I did change the speedo drive for a different used one as the one on there was coming apart. I don't see how this is anything to do with it as it has done this before with the old one on.

Dave

Last edited by dave j; 04/24/22 8:00 pm.
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Does it click if you wheel it backward?
Spun the wheel both ways on the stand?


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Spring link on the chain catching on something?

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When the weight of the bike is on the wheels, the swing arm will have risen, changing the chain line

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Hi, At the old Clubman’s Show in San Jose we pushed bikes into the hall viewing area. I’ve heard many bikes click a little. Mine does, ‘73 Tiger. John’s does, ‘69 Bonnie. Neither does it on stand. I don’t know what it is, but moving bike with chain off it’s totally silent. So it has to be in the chain or trans.
Truthfully I just ignore it. My wheel alignment is good. My chain runs to the left on rear sprocket.

Been the same for 37k miles. Cure is 3 choices… rebend rear swing arm legs. That’s doable.

Shim swing arm to left. Already to left so not practical.

Make new motor mount spacers. How will this effect side plates??

File brake backing plate .020” then shim right side. Putting thicker spacers in right doesn’t move left a trace. If find that odd, but it’s true. I’ve chased this maybe 4 times now.

In be afraid to rebend swing arm without a good jig.


So I just ride it.
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Watch the chain as you push the bike, at the rear upper motor mount bolt, won't do it all the time but keep watching and I'll bet the chain is lightly and intermittently rubbing on that bolt. I realigned the rear axle better and it stopped completely.

...although this would be more of a click than a clonk unless it catches on the bolt pretty good.

Last edited by slofut; 04/25/22 12:27 am.

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'They all do that sir.'

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The click/ clonk is firm enough to feel it in the handlebar as I push. The chain does make a lot of very light clicks and sounds as I spin it but this is louder.

It does do it pushing it backwards or forwards and doesn't do it spinning the wheel back or forth on the stand.

I did go through the bolts that are near the chain but seemed ok.

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Any of the teeth on the sprockets a little hooked?

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The teeth on the rear sprocket have some wear to the sides, about the same on both sides, but not really hooked.

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AngloBike's observation is very relevant.
"Maybe it is every one revolution of the rear wheel I will check this". Result?
If it's once a revolution I would look to the spring clip.


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No work this afternoon so had a look at the bike. Here is where I am. I did the wheel alignment very carefully. It was a bit out. After, when I pushed the bike, it still clicked so I Completely removed the chain from the rear sprocket and tied it out of the way. It still clicked! At least I have discounted the chain/ sprockets which would have been a difficult fix.

I will try lifting the chainguard and see if it goes. If no good I will have to remove the wheel and go through that. I still suspect the speedo drive but why would it not do it on the centre stand?

Dave

Last edited by dave j; 04/25/22 3:42 pm.
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Originally Posted by slofut
Watch the chain as you push the bike, at the rear upper motor mount bolt, won't do it all the time but keep watching and I'll bet the chain is lightly and intermittently rubbing on that bolt. I realigned the rear axle better and it stopped completely.

...although this would be more of a click than a clonk unless it catches on the bolt pretty good.
That was my thought too. I always use a regular nut and a slim washer there. Locknuts tend to catch, being a bit taller.

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Originally Posted by dave j
I will try lifting the chainguard and see if it goes. If no good I will have to remove the wheel and go through that. I still suspect the speedo drive but why would it not do it on the centre stand?

Dave

On the centerstand, there is no heavy downward force from the weight of the bike. The rear Shocks will be pushing downward some, but the wheel will not be supporting X amount of weight. Can a friend push the bike for you while you crawl on the ground listening carefully from both the left and right side? Might help to narrow down location of click. Just an idea...

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preload with the Shocks on the ground may just help
Transfer the sound and feel of the clonk , through the bike .

it might still be there when lifted on the centerstand , but with a different resonance .
You could try to trace down the sound with a mechanics stethoscope .

You could also remove the drive chain
with it removed
it cant be the Source if the clonk remains

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Have already taken the drive chain off as I said in my last post. It wasn't the source.

Raised the chainguard and still the same.

Just have to remove the wheel and check through.

Dave

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Check inside your brake drum too !?


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Loose spoke maybe? Bad wheel bearing?


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I didn't consider spokes so will have a look. I did check the wheel bearings recently.

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Originally Posted by dave j
Have already taken the drive chain off as I said in my last post. It wasn't the source.

Raised the chainguard and still the same.

Just have to remove the wheel and check through.

Dave
I didn't read through all the posts thorougly enough, sorry.
I trust you've looked at possible fender Fasteners and the like, that they don't catch on the tire.
Have you looked at the brake plate torque stay for any slop? With the bike off the stand the brake rod may pull the brake shoes on just a fraction, just enough to excite the plate some. On the stand, it may just be lose enough not to.

SR.

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Dave, do update us when you find the source of your click, would like to know.


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slofut- While removing the chain I managed to catch it on the chain lubricating pipe without knowing. I tested the bike by pushing and there was a continous clattering where the pipe was touching the sprocket. I thought that this must have bben the cause of the click but I had made it worse. I bent it back and pushed again but the clicl/ clunk was still there. When I took the wheel off and had alook at it and all looked normal in the brake drum. I took off the replacement speedo drive I had fitted and replaced the one I had on it previously after repairing it. All together now and the click/ clunk has gone.

The drive that was on the bike during the clunking episode was an original Smiths one. The pattern one was very free to turn but The Smiths feels a bit stiffer with a tighter spot. It was from an oil in frame bike so I had the hole enlarged. It was a bit tight on the spindle so I filed the hole a bit. I should have had it reamed so may have been off centre although it only took a few stroke of the file. It looked Concentric. The clunk was quite loud. I was worried in case the noise turned into destruction!

Dave

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