In need of some diagnostic help. . .

[TL_Music]

My TL now has 33K+ miles on her. A week ago I was out riding and noticed a horrible sound coming from what appeared to be the chain. Under hard acceleration I was hearing a metal on metal sound that got me thinking that it was time to get new a chain/sprockets. To me it sounded a lot like excessive chain noise with some sharp metal on metal ‘pings’ in it. (if that makes sense) I know the chain had 20K on it and the sprockets were most likely the originals. I chalked the noise up to a worn chain sprockets.

Now we’re here a week later with new 17 tooth front, 40 tooth rear and DID X-Ring chain. Still got the noise, but doesn’t seem as bad, nor occurring as often. Any thoughts? I’m not sure where to go next.

[Seca]

Is it only when on the gas?

[TL_Music]

Yeah...Only when hard on the gas, doesn't happen all the time.

[Seca]

Well any "Metal on Metal" sound would kinda scare me. I would say to be safe crain your oil and make sure there isnt any metal in it. You will see a silver swirl kinda thing in your oil. Also grab a buddy to rev it up while you search for the sound...that is if it does in in nuetral also.

[TL_Music]

I agree. I'll take a look at the oil.

Any other thoughts from the planet? I don't suppose anyone else has heard this.

[Crusher]

Is your back wheel on perfectly straight? Is there too much slack in the chain? Does it do the noise if you rev it hard, but your in neutral?

[Steve TLS]

Every gear?

[TL_Music]

As I mentioned above I just had new a new chain and sprockets put on, but the tiller was making the noise before that. I haven't had a chance yet to drain the oil, which is my next priority.

No it doesn't do it in neutral and it doesn't seem to be in every gear. I believe I heard it the most often in 3rd or 4th, but I'm a little hesitant to go rip it up to figure out the method to the madness.

Hmmmmm

[LiononaLeash]

check: rear wheel axle may be loose...

check: rear wheel axle bearings....

check: chain rubbing on swingarm on top....

rear brake caliper dragging... check to see if it is coming from there. maybe break caliper is loose? worn pads too?


just shooting from the hip here.

[LiononaLeash]

also... when the bike is parked... have a fat guy sit on it to compress the rear suspension... that way it will simulate what the supension looks like under hard accel....

look around to see if there are any clearance issues in the rear.

[TL_Music]

Originally posted by LiononaLeash
check: rear wheel axle may be loose...

check: rear wheel axle bearings....

check: chain rubbing on swingarm on top....

rear brake caliper dragging... check to see if it is coming from there. maybe break caliper is loose? worn pads too?


just shooting from the hip here.

Rear axle appears fine, torqued to the right lbs.

Bearings....need to check.

chain rubber OK

rear caliper is fine, has new pads and is clean.

The sound appears to be coming from the left side . . .

I'm at a loss and I hate taking my bikes to a shop and saying "uhhhh, I don't don't know what's wrong - it's making funny sounds" Sounds like an invite for a good $$ soaking.

Thanks to your hip though.

[LiononaLeash]

don't forget the check the fat guy thing too!!!

[TL_Music]

OK, ok....I'll try to find a fat guy. I must be really tired because this seems really funny right now. I keep picturing myself wandering around downtown San Francisco on my lunch break asking fat people to sit on my bike and swearing under my breath at all those skinny people.

[Crusher]

Just walking around San Fransisco asking a guy for ANYTHING is creepy

[speedracertlr]