I have 7 ATVs/bikes. This 1 70cc CAG has had a very erratic idle. It would start ok, but would rev low, hi, med then off the scale ! I figured it out as the cable where it goes into the top of the carb was loose. Not actually the cap for the piston/slide assembly where it goes into the carb, but the cable goes into a swivel. I marked where the swivel is best suited then glued it securely into place. As the engine ran & vibrated, it made the carb needle move around in the carb throat area. Bravo - works great now & I have regained throttle control.