Mystery Noise..

[Man-O-Steele]

Bikes been making this noise for quite a while. the only time it makes the noise is when its on a real low idle. if i barely touch the trottle the noise goes away. i checked the flywheel and it is fine. it kind of sounds like the noise is in the case directly behind the sprocket. bike has oil in it and no metal shavings in in the oil. the bike runs and shifts fine. any help would be appreciated. thanks.

 

[locogato11283]

No way that can be good.

 

Reminds me of grinding gears in a big rig.

 

It's like it's trying to go into gear, without the clutch or anyone doing it.

[guns4children]

I say just run it. Chances are you will be in the motor before anything fails and you can take a look then.

[Nieskes]

Pull it apart something is fucked up.

[The-Association]

Does not sound like piston slap or knock.. Somethings loose. What have you done to her as in maybe rebuild or removing/installing?

[Man-O-Steele]

the top end is pretty fresh. i had it ported by fast and bought pistons and rings at the same time. i have a feeling its a trans problem. i just dont see why it goes away with a touch of the trottle. i was just hoping that someone on here has had the same issue in the past.

[FREAKSHOW]

the top end is pretty fresh. i had it ported by fast and bought pistons and rings at the same time. i have a feeling its a trans problem. i just dont see why it goes away with a touch of the trottle. i was just hoping that someone on here has had the same issue in the past.

 

IMO , Take engine out and disassemble. Problem should be obvious.

Edited September 18, 2012 by FREAKSHOW

[dave5.0]

Sounds like you're holding the kicker down

[notsed]

mine made a noise like that before, turned out to be the kicker gear rubbing the idler gear, i dont remember why buy you might want to check that.

[Starwriter]

Disengage the clutch and put it in gear. If it still makes noise, it can't be in the transmission as nothing is turning in the transmission then.

[locogato11283]

I bet it's a work idler gear bushing. I'd pull the clutch cover. A worn bushing can kick the clip and washer off.

 

 

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[blubyyou]

Mine does the exact same noise....low idle only. If I up the idle it goes away. I have bumped up my idle slightly and the majority of the noise disappeared. It drives me nuts. I will tell you I have a fresh 4 mil stock cylinder motor, and replaced my transmission with one of Camatv's cut ones....noise still there. Replaced the idler bushing with a FAST replacement....noise still there. New clutch plates and fibers from TUSK too. Only thing I haven't changed is the clutch basket and pressure plate. I'm thinking it may have some play in it but I realy don't think that's my noise. I almost think its from something rattling on the kicker gear or idler gear but have been unable to diagnose the problem. I hope you find out what it is because I would love to fix mine 100%. Good luck...hopefully you don't have to replace the parts I did because it didn't cure my problem and I'm still chasing it down.

[blubyyou]

Notsed.....what did you do or replace to fix your rattle?

[shanYE west]

thats exactly the noise mine is making also.. It just started making this noise. . I have split the cases and inspected everything.. I can't figure it out either..

[blubyyou]

Bump for this....I'd definitely like to fix this on mine.