Motor is a Yamaha 9.9 4 stroke with maybe 10 hours. It has been about a year since the motor was last started. I put motor in a test tank with fresh fuel in gas tank. Motor started right up but smoked (looked white to me) for a second then stopped. There was what looked like oil floating on top of water in the test tank. Motor ran fine. I started the motor 3 other times and there was no smoke. Do I need to have the motor checked out?
