The first time I gave it any accelerator above easing it around, lots of blue smoke from the exhaust. I thought it had blown up. Called 2 dealers one said too much oil in engine, the other too much in air filter. There has been no more smoke Any one had this problem? Also didn't have a Engine brake. I set the Idle back and now have the brake but doesn't seem strong. The machine will out run the brake down hill. Also when I pull out up a small hill it seems the belt slips. The machine jerks until the engine gets faster. And last when you accelerate quickly and let off or put it in low and go slow down hill there is a thump in the drive train. It sounds like slack in the U joint or smoething loose. It still has lots of warrenty. Anyone have these problem or is the nature of the machine? Any help appreciated.