Help identify this drivetrain noise...Please.

K

Koko

New member
Sorry for my numerous posts everyone. But I have no one close by who is into 2 strokes or off road riding in general. Thus, the only way I learn is by asking all of you the pros to help me out.

The video below is a noise my bike is making. The tranny is in neutral. The noise seems to be coming from the rear wheel. It spins easy. But you can "feel" this noise. I just can't tell where it's coming from.

I hoping it's not coming from the tranny and just making the noise sound like it's out back. The chain rollers seem to roll easy and the rear bearings seem nice and tight. Driving the bike it seems perfectly find. No shifting issues, etc.

Or am I just newb and this is normal free wheeling drivetrain noise?

http://fototime.com/90ADC0A8A18DC8D/convx264.mp4

 
How are the chain and sprocket. That is not a normal noise. Is the rear wheel aligned properly?
 
I don't think so. If anything, it may be on the loose side. I'm going to pull the chain tonight and see if the noise in the wheel, front sprocket (I hope not), or the chain rollers.
 
sounds like the chain / sprocket, chian trying to jump the sprocket...does it make the same sound when turned the other direction?

P.S....whats up with the "Clay" quote in your post?
 
It was a just a sarcastic quote meant to be funny, which sure did make me laugh. So I quoted it in my sig. I should probably remove it, I don't want people to think that's the truth. LOL

To answer your question, yes, it does make it in both directions.
 
If it was my bike, I'd pulled the wheel off, inspect the wheel bearings, seals, make sure you have the spacers on the correct side, if not the offset will be wrong and you may have a brake rotor bolt hitting something.

With the wheel off, you can rotate the c/sprocket and take a listen.
 
Its easy to isolate mate. Start by grabbing the rear wheel at 9 and 3 oclock and move it in a push pull action. Should be no play. If there is the wheel bearings are toast. Next pull the axel and the rear chain roller, take the chain off the front sprocket. and hang it over the outside of the swing arm. You can now test the front sprocket to make sure the noise isn't coming from there. Put the back wheel back on without the chain on and turn the wheel and see if it clicks just rolling on the axel.

Things that come to mind for me are the following. Either wheel bearings are shot and its clicking as it grinds over. The brake caliper/swingarm mount is worn and its grabbing and releasing (you will see this turning the wheel like in your vid), or the axel blocks aren't straight and the chain is running at a different angle and putting a side load on the sprocket.
 
SOLVED!

Thanks everyone. When I got home, I removed the chain, front sprocket spun freely. Rear wheel sounded terrible. Brakes looked great and did not look like anything was moving out of the ordinary. No movement in the wheel to make me believe the bearings were bad...that is until I decided to pull it apart.

Looks like somehow the inner race of the bearing sheared off. Sending shrapnel to do damage to the "Long wheel spacer" and "rear wheel spacer". I believe they are part numbers. BE250318021 and R575700.

Here's some pics:

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Now my worry is the hub. Inside the middle of the hub is groved similar to the rear wheel spacer pictured above. Does that mean my hub is trashed?

Ugh, I hope not. I haven't even been out on the trails yet with this bike. Boy, I'm learning a lot on buying used bike.
 
Post up a pic of the hub. Is it grooved where the bearing seats?

The grooves in the spacer can happen over time anyway from where the seals rub away at them. Particularly noticable on alloy spacers. You can get hardened ones from checkpoint offroad.

If the inside of the inner spacer is still good and the grooves on the outside arent too deep, and the grooves are inside the hub itself and also not deep enough to cause any issues with strength I would just clean them up with some wet and dry and put it back together with fresh bearings, seals and spacers.

I've got no idea how that part chipped off but I'm guessing it would be during installation, and the bike appears to have been ridden for some time with it floating around between the inner spacer and the hub body. Gotta love second hand dealings.
 
Where the bearing seats into the is fine. No issues there. This was just a quick wipe with a rag. I haven't used a cleaner to clean it all up.

standard.jpg


It's just the middle of the hub where the wheel spacer rides. It looks like the wheel spacer. Shallow grooves. Nothing deep and sharp. Look down through the hub in this picture.

standard.jpg


I also noticed, there was no spacer between the bearings on the sprocket side. Unless it some how disintegrated.
 
If the grooves in the inner hub are as shallow as you indicate, I say.... Put it together with new bearings and spacers. Go ride and enjoy.
Keep a lookout for a used wheel [here/fleabay/CL] for peace of mind.
Where are you located?
 
wrench said:
If the grooves in the inner hub are as shallow as you indicate, I say.... Put it together with new bearings and spacers. Go ride and enjoy.
Keep a lookout for a used wheel [here/fleabay/CL] for peace of mind.
Where are you located?
Click to expand...

I agree. As long as the bearing mating surface is good, I would replace the bearings and spacers and enjoy!
 
Great, that's what I'm going to do. Parts have been ordered. Hoping the crates of parts that Go Fasters just received has the bearing spacer. That's the only piece they didn't have in stock but believed it's sitting in those crates.
 
maybe????

If they dont end up having one available,i'm sure i have one kicking around.have to find it but if thats the only thing keeping you from riding i'd let you use one of mine until you can get one from GF.im in franklin about 30 or so miles away
Stoby
 
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