After replacing my 2 clutch bell bearings, & cleaning the outside of my engine with WD 40 I put a small amount of fuel in the tank & started her up. She wouldn't run for too long so I adjusted the idle. With the wheels off the ground I applied some slight throttle & noticed a lot of smoke coming from the exhaust. Would this smoke be due a tuning issue or something more serious? I hope my engines ok. Plz help.