use any oil? best thing would be to siphon some and spend $20 on an analysis, then change the oil/filter, being sure to check everything external form proper torgue/no leaks, et all....my guess is normal combustion, realize todays emission controls "trap" almost all external byproducts of the motor...
If your dealer is close I would just run up to the service dept. with the ski and have them come outside for a second and see what they think. The ski is under warranty so I wouldnt want to spend any money on something that they should diag. and fix.
Mine is the same. I slight smell of gas on the oil. But the level is normal, it did not increase. Almos 10 hours. At that time will change oil and filter. If the smell continues will take it to dealer.
Mine is vtech tuned and no flame arrestor. Could it be related?