2001 Kodiak clunking noise.

[jannonballs]

2001 Yamaha Kodiak. Rebuilt and cleaned 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?

[jen]

I had no low end power intermiiantly om yamaha 700 sxs.  I replaced the belt with an aftermarket and rebuilt (cleaned and relubed) primary and secondary clutches. The new belt lasted about 4 miles  and belt exploded into shreds.  Admittedly i went through some heavy mud during the four miles.

Guys told me the aftermarket belt will not take the heat.  However, the primary had a 0.04 in smooth grove. in it (see herewith).  I replaced the belt wit an OEM and replaced Primary clutch (got from EBAY).  Runs great now.

Don't know if this adds to the wisdom file for your problem.

[Gwbarm]

It could very well be the clutch, but i would expect more noise if it was the clutch. The small hesitation sounds like an occasional miss but that should not make it increase engine speed, thats sounds a bit like it is inconsistant fuel supply the leaner running would cause the increase in speed. You said you cleaned the carb, find any problems or just dirty. I may look at that again to make sure nothing got back in there, sometimes there are small particles in old lines that get reintroduced into the carb.

[jen]

BTW you can see the remains of the aftermarket belt in that picture of te primary clutch.