Need Help!

[1dietz]

I Have a kasea skyhawk 50 (all stock). The problem is it wont rev up & has no power. It idles fine. but nothing above that. 1st i took off oil tank pluged oil ports. mixed fuel & still the same. I have a new 50 (stock) & took off carb and reeds, put them in the old quad.(same main jets)- still the same problem, Them compression tested both new(145psi) & old (135psi).
My question is Could the clutches (if bad) Limit the motor Not to rev up?

[LT80]

For the time it takes to check the clutchs, I'd deff. look there, but it isnt a probability.
Does it rev up with the rear tires off the ground?
Try switching the pipe. Maybe it's gunked up and cannot breathe.

[newnick]

Some mini's have a spark arrester. If yours has one that might be the problem. It would be at the end of the silencer.