I have a 2001 Eton 90cc four-wheeler. It has loss of power, will not accelerate, will idle, engine sounds like it is laboring when throttle is full. Please help... Thanks.

 

Welcome to the forums.
I allways start with a good carb cleaning.
Then I'd do a compression test (100-120).
If both those are good, I'd get into the clutchs to inspect for a problem.

 

I have replaced the carb; compression test at 120 psi; good fuel flow. Will a clutch problem prevent it from gaining RPM? What is the fix?

 

No revs with no load? Have you checked the exhaust?

 

could be fuel in the crankcase, plugged muffler, bad crankshaft seals or problems in the clutch housing. I had a Yamaha 125 doing that one day....pulled the belt cover and found the clutches and belt housing to be packed full of rabbit hair....freakin' mice!!! It took me 3 hours to get all of that stuff out of the clutches and starter mechanism.