Would bog down he cut tall grass. Became very difficult to restart.
Had to remove the air filter to get it started. Doing that exposes the crank vent to the air. Changed the oil with some used 5000 mile synthetic from my car. Old stuff was not even quite black but almost grey like aluminum. New used stuff looks almost like the old stuff after a half hour running. It’s a bad sign when new oil is black right away.
Once started it would sometimes stall while putting out a huge amount of white smoke after a bit of heavy cutting or going up a hill. The oil separator must be bad on not able to handle so much blow by.
The issue was there is so much blow by that the fuel air mixture getting in to the crank case goes out the crank vent and in through the carburetor again where more fuel is mixed in, resulting in a too rich mixture.
Took forever to figure this out. I even ordered a new coil for it. Directed the crank vent to the outside now it starts fine. But if I start it with full oil it loses 1/4 of the oil out the crank vent aftel a half hour of mowing.
I guess it’s time for a new mower. The nice thing about 2 stroke is it either always had clean oil in it or someone forgot and it’s blown up all the way.
Anyone have stories about very worn cars or other engines? I don’t think cars vent the crank case through the carburetor again like this did.