I have a 19 HP Briggs engine on a riding mower with about 8 hours on it. I turned it on its side to put a belt back on and ended up flooding the engine with oil. Since then I have gotten the engine to start, but it is still smoking after running for 3 hours, has no power, and will not start with the drive belts in place (will not turn fast enough). The engine is blowing oil out both the oil dipstick and the breather tube and is VERY hard to start. I took the cover off the crankcase breather to see if it was full of oil and there is no standing oil there. Any suggestions? this engine is brand new and under warranty, but I want to make certain that there is no reason for a warranty claim to be rejected before I take it in.