Toro 20066, white smoke

[CarlQ]

I had a problem today with my four-year old Toro 20066 lawnmower. First, the cord would not pull. I disconnected the spark plug, tilted the front of the mower up about 30 degrees to manually move the blade and remove and debris. I laid the mower flat again and pulled the cord. The engine started but started to began to emit white smoke after 30 seconds of running. I saw a fair amount of oil under the muffler. I had overfilled the crankcase earlier in the year so I drained some oil and started it again on one pull. Again, the engine started smoking after 30 seconds. I removed the air filter to see if that was the problem. It started it again but had the same white smoke. There was no problem with the cord not pulling or white smoke prior to today. Any ideas?

 

[CraftsxMan]

white smoke = oil getting into the combustion camber = blow by...and not beings able to pull your cord..it all sounds like a blown motor my friend and when you said you had put to much oil in then drained some out, is there a possibility that you drained WAY to much out and fried the piston rings after you had started it?

 

[Rivets]

I'll bet you have a common fuel problem. The smoke you saw was the result of a bad float needle and seat. The seat is not sealing and fuel flowed through the carb into the crankcase, causing the mixture of fuel and oil to seaplane into the cylinder. I would rebuild the carb and replace the replace the needle and seat, part number 398188.

 

[EngineMan]

I had a problem today with my four-year old Toro 20066 lawnmower. First, the cord would not pull. I disconnected the spark plug, tilted the front of the mower up about 30 degrees to manually move the blade and remove and debris. I laid the mower flat again and pulled the cord. The engine started but started to began to emit white smoke after 30 seconds of running. I saw a fair amount of oil under the muffler. I had overfilled the crankcase earlier in the year so I drained some oil and started it again on one pull. Again, the engine started smoking after 30 seconds. I removed the air filter to see if that was the problem. It started it again but had the same white smoke. There was no problem with the cord not pulling or white smoke prior to today. Any ideas?

Take out the spark plug then see if you turn over engine by hand, then remove all old oil in cylinder and on outside of engine (wash it down) clean air filter then start the engine and let run for a few minutes, smoke will burn off soon after if all you have done is over filled it.