I have a 1999 sabre 1642. It was running fine for about 10 min. & then stalled & a lot of white smoke came out of the front of the mower. I didn't see any oil leaking or anything & the smoke smelled like a belt burning but it wasn't. After 10 more min. it started fine with a little smoke then it was okay for 5 min. & the same thing. Have any ideas?