2005 Yamaha Kodiak 450 noise from clutch

[Mudseeker149]

Just bought the atv, sounds like there’s sand in a bearing near the clutch! Any ideas? 

[spock58]

It's likely that the one way bearing that's part of the centrifugal clutch has failed. To check it out the cvt clutches have to be removed first. 

There is a cover in behind them that gets removed to access the cf clutch system (that runs in engine oil btw).

[Mudseeker149]

I kinda figured that’s what it was, is there a special puller to get the cvt clutch off?

[spock58]

I don't believe a puller is needed, just use an impact wrench to get the nut off. You will need a gasket if that cover is removed.

[Mudseeker149]

Ok perfect! Going to try and get it apart this week

[Charlesawest936]

What i would do is either pull the cover and pull the belt off of it and run it just to make sure that the noise is actually coming from the clutch itself. If the noise is still there id pull the clutch and check out the rollers in it.

And no sir theres not a special tool thats needed to remove that clutch its just a 22mm socket and then it pulls right off.

[Mudseeker149]

Thank that’s a good plan! Then I know for sure it’s coming from inside! 

[Charlesawest936]

Not a problem bud i just got the gears in that i ordered and 2 of them are different so hopefully i can get it figured out.

[Mudseeker149]

So I got all the clutch side apart and swapped it all with good known parts and still makes the noise! Must be coming from in the transmission!  

[Mudseeker149]

No one else has had this problem?? 

[jannonballs]

2001 Yamaha Kodiak. Rebuilt carb after sitting for 10 years. Got her runnin but now this clunking noise is happening and sometimes the engine stalls hard like the tranny or clutch abruptly stops the engine. This was not happening 10 years ago. Also the clunk will happen and the rpm's spike. See video. Any ideas before I tear into it?

[spock58]

Can't say for sure but it's possibly from the one way bearing that's connected to the engagement clutch that works with the drive clutch. 

You'd need to pull the drive (primary) clutch first - the one mounted on the crank that turns the belt. In behind is the clutch/bearing that runs in oil which does the engagement. They are known to wear out eventually.