knocking sound and back wheel slowing rotation - any ideas?

ikkledivel · Borekit Bruiser Joined: 20 May 2008 Karma :

hey guys

im having trouble with my gixxer again Sad

was walking the bike into the yard when i noticed a "knocking" sound coming from the back of the bike.......we got the bike on a paddock stand and turned the wheel and once again could hear a really audiable knock, however its not a consistent knocking.....only every now and then. We decided it was possibly something to do with the chain or rear bearing, so cleaned the chain, lubricated but the same noise happened, so then we got the back wheel off and checked the bearing and that appeared to be in good condition.....so back to observations of wheel spinning and chains and we noticed that just before the knock the chain is being pulled in tighter at the engine end of the chain and the back wheel slows and starts to stop before carrying on.........please can you help me have an idea of what is happening?? is it a sprocket thing?? chain thing?? chain guidance?? (chain doesnt look to have any kinks) or am i just going to have to bite the bullet and take it into a garage Sad

thanks for any advice or ideas

Nic x
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chris-red · Have you considered a TDM? Joined: 21 Sep 2005 Karma :

How often does it do it? once every turn of the wheel once every complete rotation of the chain or neither.
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iooi · Super Spammer Joined: 14 Jan 2007 Karma :

ikkledivel · Borekit Bruiser Joined: 20 May 2008 Karma :

ikkledivel · Borekit Bruiser Joined: 20 May 2008 Karma :

Gazdaman · I did a trackday!!! Joined: 12 Aug 2004 Karma :

I agree with the above, sounds like a tight section in the chain through poor maintenance.

Although my bike did make a similar noise when my cush drive bearing went. To check that, wheel off, remove the cush drive and it should be just inside the cush drive. My bearing had completely collapsed causing one of the sprocket bolts to hit the swingarm sometimes.

Gaz