[jeffro149]

After using my 149 for around 10 years, I have just finished my first rebuild of a K321. I have built several V-8s but this is my first go at a Kohler. Everything has been replaced, minus the cam. I went through the break-in process...new oil, head torque, tappets and carb adjustments.

The engine runs great at low and high idle. At first the engine would bog under load, then I discovered the governor arm was slipping.

After readjusting the governor arm and setting the high idle stop all appeared to be perfect. I mowed for around 15 minutes and the idle suddenly jumped way higher than I set it and the throttle cable would not slow it down. I have checked the linkages/cables and all appears to be the way I originally set them.

Any help will be greatly appreciated.