Nasty gearbox knock ! ? (cbr600fx)

samomighty · Scooby Slapper Joined: 03 Feb 2006 Karma :

Hi my bike (cbr600fx) has just developed a knocking noise sounds similar to a chain slipping round a sprocket and doesnt have a set timing pattern but is a lot worse when bike is on centre stand , in any gear ticking over i just bought a whole new chain and sprocket set thinking it was the worn front sprocket and chain but its still there ! could anyone help me with what it could be ?
https://uk.youtube.com/watch?v=Jan8qEH38Sg
Thank's Sam

Timmeh · World Chat Champion Joined: 01 Nov 2006 Karma :

it sounds like something's wrong with the clutch. Does the sound change when you pull the lever in?

Could be wrong though.
____________________
GSXR400 x2 | '94 RVF400 | '93 TZR125 4DL (again)
20:22:30 BLUEX5: i would love to be forced to undergo a**l plugging with different sizes
20:48:18 Temeluchus: comp you hunk of smouldering homos3x you

Paddy Blake · World Chat Champion Joined: 29 Jun 2006 Karma :

Did you have the clutch of the bike.
Was any other work done.

Paddy.

samomighty · Scooby Slapper Joined: 03 Feb 2006 Karma :

samomighty · Scooby Slapper Joined: 03 Feb 2006 Karma :

It started just as a very intermittent knock at different points when i was riding then it started doing it a lot at slow speeds (pulling away up to 30mph was the worst) no matter what gear im in at all times i.e. it would just make single knock sound now and again when i was powering up , down , changing gear , braking and holding a steady engine speed that was when it wasnt so bad i dont fancy trying to test it at the moment as i dont want to reck it !

Sam

MarJay · But it's British! Joined: 15 Sep 2003 Karma :

finpos · World Chat Champion Joined: 13 Sep 2005 Karma :

That sounds to me exactly like the chain is hitting something. I'd check the chain tension, wheel alignment, remove the chain guard, and, as you say it's worse on the stand, look to see that the wee nylon slipper is in place where the chain runs over the top of the swingarm.

f.

swaffs · World Chat Champion Joined: 18 Mar 2004 Karma :

Sounds like the cam chain tensioner, I have a 2000 FY and it's a common issue.
It won't do any harm but can be annoying.

Here's a detailed description on how to fix it yourself.
https://www.bossturbo.com/cbr/howto_cct.shtml

Some people have been know to change them and it goes again only a few '000 miles later.

The only real way to stop it is to fit a manual one. I couldn't be arsed with that.

Rich Swaffs
____________________
Swaffs Photography |
BCF vinyl stickers
"Look not back in anger, nor forward in fear, but around you in awareness."

samomighty · Scooby Slapper Joined: 03 Feb 2006 Karma :

It sounds like its from the gearbox though and if you watch the rear wheel running in gear when it knocks the back wheel jerks as if there were teeth missing on a gear somewhere but the revs dont die and theres no major sound from the front of the engine but this has only happened over about 80miles it was fine before then while i was on a ride it just got progressively worse now it does it constantly like in the video i posted, its just such a pain it happened before im meant to be going away to a few places for x-mas Sad

samomighty · Scooby Slapper Joined: 03 Feb 2006 Karma :

I was having a look in the haynes and could the drive shaft bearing be shot seeing as it does it in all gears and gets a bit faster through the gears even though the revs are the same ?

samomighty · Scooby Slapper Joined: 03 Feb 2006 Karma :

Sorry to keep adding things a bit at a time but i just ran it again and the sound seems to go if i drag the rear brake which again makes me think maybe the rear drive bearing ?

Thank's Sam

jimbothe · World Chat Champion Joined: 29 Sep 2006 Karma :

https://cbrworld.net/forums/thread/277240.aspx

any good?
____________________
Check out our tackle shop on Facebook:
https://www.facebook.com/#!/JklTackle

samomighty · Scooby Slapper Joined: 03 Feb 2006 Karma :

It doesnt sound like its from the clutch but there has always been a bit of clutch noise anyway but not a bad noise like this !

MarJay · But it's British! Joined: 15 Sep 2003 Karma :

Vincent · Banned Joined: 16 Oct 2006 Karma :

Is it possible you may have overtightened the chain Question

Could be wheel bearing or front sprocket bearing. If it's the wheel bearing or sprocket carrier bearing you should be able to feel it when you turn the wheel by hand. If not, remove the front sprocket cover and check for play in the shaft.

Vincent · Banned Joined: 16 Oct 2006 Karma :

Oh, BTW, try the old screwdriver to the ear test, place it on the clutch cover & near the front sprocket somewhere solid.

samomighty · Scooby Slapper Joined: 03 Feb 2006 Karma :

finpos · World Chat Champion Joined: 13 Sep 2005 Karma :

samomighty · Scooby Slapper Joined: 03 Feb 2006 Karma :

baldy · World Chat Champion Joined: 15 Feb 2004 Karma :

It is yor chain, my bikes do it, it hits the swingarm when it wobbles. my cbr had the camchain thing, that was a lot quieter. If it does it while your riding, your chains not adjusted properly.
____________________
One day i will rule the world, just not today.

Pete. · Super Spammer Joined: 22 Aug 2006 Karma :

Looks to me like you're idling the bike with it on the stand and in gear. Sounds like back-lash in the gears because your idle is so rough. Balance your carbs and it will go away. I would stop doing it in any case before you damage the gearbox.

Ride the bike on the road under gentle power and I bet you don't hea anything. If you do, your chain it too tight or you have a knackered bearing in your rear wheel/sprocket carrier.
____________________
a.k.a 'Geri'

132.9mph off and walked away. Gear is good, gear is good, gear is very very good Very Happy

TUG · World Chat Champion Joined: 12 May 2007 Karma :

Does it still knock when the wheel isnt moving? could be bearings in the rear wheel, but i'm probably way out with this suggestion. I hope you sort it out. Thumbs Up

____________________
Haz ER-5, innit!