I have a Lesco 48" walk behind with a Kawasaki FB460V engine. Engine runs fine for about 10 minutes, then the engine just loses power, starts smoking, and then oil comes out of the dipstick tube. I thought I was getting fuel in the crank case, so I drained the oil, and the oil comes out like water boiling in the pan. Once it cools, it looks like oil again, so I don't think it's gas in teh engine. I also have a 1967 Deere 112, more as a toy than anything, but I started cutting with it and it did the exact same thing. 10 minutes runs fine, then smoke, then oil boiling out of it.
I would take fan shroud off both engines and see if some critter has made a new home.
That would cause them to heat up fast, also don't run either one till you find problem, get them too hot they will seize.
#4
Carscw
I agree take the covers off the engines and clean the cooling fins.
