kohler on predator misfire

[tim perkins]

Hi all anyone had experience of misfiring on Kohler 14hp. Starts fine runs well for an hour or so then starts misfiring usually when the hole gets deeper. Fuel seems to be flowing ok. I dont think its tank vacuuming/air filter or wiring. Dealer not able to help. great site. ideas for the above welcomed.

[rapalaman]

Had problems with mine misfiring on supermarket fuel, but that was right from cold. Using BP or Shell now and it's fine. As it's when the hole gets deeper it possibly points to engine oil level - I think it's designed to cut out before the engine runs dry as the angle changes. Service agent topped mine right up to the top with engine oil and advised the level should be right up to the top of the filler hole.

The fuel filler cap is a known weak point on these - got a Honda one fitted now.

Hope these checks might help you!

[marne]

I'm pretty sure that if the hole gets deeper, you tilt the machine so much, that the oil sentry switch kills the ignition.

Because of the rotating mass, the piston keeps pumping fuel/air into the cylinder that enters unburned the hot exhaust. Bang.

 

Congrats, you have reached the machine's maximum grinding depth.