The smoke looked fine from the exhaust and yeah someone else also said could it be drawing air and the throttle is nice and feels nice to use and free I was just hoping many some how it's over heated and not liked it and revved up when it's got so hot as I noticed the fan not working but I started it afew days after not for long but it seemed all fine but I dont know if I dair take it out for the day to see what it's like or if that's a bad idea?