I've got a Snapper Walk Behind that has a Kawasaki 460v motor on it and it keeps cutting off. It will run for 10 minutes, 30 minutes, 5 minutes, etc. and then cut off. I have had the carburetor replaced twice and the mechanics at my shop have given up on it. I was talking with another mechanic today and he said it may have something to do with the cooling or coolant. I am not aware of this machine having coolant, but I have to imagine that it has some sort of mechanism that keeps it cool or shuts it off if it gets too hot. Anybody have any ideas on how to fix this problem? Thanks!