What happens if you put 2 cycle gasoline into a 4 cycles lawn mower?

Question

What happens if you put 2 cycle gasoline into a 4 cycles lawn mower?

Answer 1

There is really no issue running 2 stroke in a 4 stroke motor, but you will deal with a minor loss of power to moderate depending on the ratio of the fuel oil mixture. When I have left over gas from my weed-wacker or  chainsaw I run it though my lawn mower I just change the oil more frequently due to the blow past around the piston, and I have to clean the spark plug more often and replace it more frequently

Answer 2

It will not harm the engine you will experience some smoking it may become harder to start as the plug becomes fouled from the oil being burnt. If it was not much top off the tank on a regular basis reducing the ratio of oil and gas using fresh gas.

Answer 3

While it still runs, you will have blue/white smoke from the exhaust.

2 cycle gas (mixed) has oil in it, 4 cycle doesn't.

In the 4 cycle, the plugs will foul out.