If you mean you put 2-stroke MIX in the tank of a 4-stroke mower, there's no problem. If you have a no-start situation, this isn't the cause. At worst you will get some smoke, and possible a fouled spark plug, but most likely you won't even notice the difference. In fact, I use 50:1 2-stroke mix in ALL my equipment. It saves making an expensive mistake with my 2-stroke tools, as 2-stroke mix is all I have on site - so I never pick up the wrong fuel can!
If you have put neat OIL in the tank, you will have to drain it, and the carb, and clear out the carb jet.
phil_saunders(a)bigfoot.com
Phil Saunders, September 2012
