I have a 48 Bunton premium gear drive with a 14 horse kawa. It is brand new. The first time I used it, I was mowing a hillside. I mowed it for about 15 minutes and then all of the sudden, thick white smoke came out of the exhaust for about 5 seconds. Thinking it may be an oil problem (I did check it before I mowed), I stopped the motor and checked the oil again. It was OK. That was 4 weeks ago. I mowed again, same hill, checked oil, same 15 minutes, and it happened again. Can anyone tell me why the Kawa is doing this. Should I take the mower back or just leave it alone. Thanks in advance for the replies.