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Discussion Starter #1 (Edited)
Soooo, went for a ride today - 100kms (62 miles)there and 100kms back, average speed 150kmh (92mph) - on the way home pulled up at an intersection and nothing out of the ordinary until I took off - and sounded like the crunch of an old front wheel drive with stuffed CV joint on full lock

I stopped, checked it all out, and nothing obvious, no leaks, not extra hot. Had to ride home very gingerly, noise still there, but only when taking off from traffic lights and low speed, low revs - no noise no vibrations at higher revs (3k) 100kms (62mph)

I can only think that I have a bearing that has failed/failing at the front sprocket - yet to pull it apart, probably won't for a fortnight, have a holiday in Asia to deal with :)

Have any of you experienced this - something like this or have any idea what it is?

Will update when the tools get out and I start to remove the fairing

just thought it would a good chance to ask


oh forgot - 2006 xx - 60K on the clock

cheers

Dean
 

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sure your chain is ok - does it only happen when moving (not rev related)

could it be a wheel bearing

can't think of anything else - not common whatever it is
 

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When you open the cover take note of the output shaft and sprocket. There is a condition known as brinneling. When you have 2 hardened surfaces contacting under a load it will make an awful racket. As Rocketeer has stated pull the sprocket clean it and the splines then pack the sprocket with grease and reinstall. I use a Moly grease and reload it every 6000 miles when I change oil and clean my K&N air filter. Here is a link to what i suspect you'll see when you pull the cover.

https://www.cbrxx.com/general-cbr-xx-discussion/28122-what-deal-my-front-sprocket.html
 

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I had a similar very ugly noise a couple times over the years. New chain and sprockets took care of it.

ominousone
 

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Might also be a stuffed chain...... try the old press the slack tight and pull the chain link off the rear sprocket trick...... if the link in the middle of the sprocket (like at swingarm height off the ground) moves away from the sprocket while the chain is being held tight, then the chain is worn out....... and so too are both sprockets if they have been on for the duration.

I've heard guys ride past with their chains & sprockets grinding/graunching/clunking/slapping the swing arm...... what a racket! But they don't seem to hear it while riding. You should have an inch of slack when you test a chain in 6 places...... and not be able to lift that link from the rear sprocket with tension on the chain...... 62K is about right for a hard ridden bike...... I got 100k kms out of my oem chain & sprockets - but I don't get to do big speeds out here (too many licence loosing obstacles or bone breaking wildlife speedbumps :crap:).
 

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Discussion Starter #9 (Edited)
Okeees, update

I got back from my overseas holiday and popped the rear tyre off to have a look at what the noise was.
The inner back brake pad wasn't installed properly, they have a slot they sit into, the previous owner didn't quite get it right and it was sitting lower than designed. Not really a noticeable problem until I went for my big ride and used the brakes hard in a few spots, the metal backing of the inner brake pad was scraping the rear wheel. Lets say all fixed now - might check the front ones now to make sure all is good.
 

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Dean
If it scored the wheel hub you should take a file of piece of steel rod and sand paper and smooth out the gouge. It'll prevent any stress cracks from forming in that area. Then a light coat of paint to keep it preserved.
 

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Discussion Starter #12
Dean
If it scored the wheel hub you should take a file of piece of steel rod and sand paper and smooth out the gouge. It'll prevent any stress cracks from forming in that area. Then a light coat of paint to keep it preserved.

Yeah good idea - might be a good opportunity to colour code the rims :)
 
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