It may be the switch, look at drawing if you have one but I think it shorts it out. I had one on a briggs linc do that a while back.

 

Got to start looking somewhere, this sounds as a good a place as any.

 

Is high idle integrated into the off switch?

Sounds like you have a multiposition rotary switch or toggle switch. Pop the switch out open it up, douse it in CircuitSafe, LectraMotive, or some other electronics cleaner that has a cool name (the cool name is important). Isopropyl alcohol would work, too. The idea being to wash away any contamination and to displace any water that may have made it into the switch.

Could be as simple as that.

Sent from my Lincoln Buzzbox using Tapatalk

 

It goes to high idle because the 12 volts have been shut off... Ergo no power to the idle solenoid, the ignition switch probably also incorporates a magneto ground thats not working, I could be wrong but it's worth checking out.

 

If it is a Kohler check the solenoid on the carb bowl. I'll bet it is stuck open.

 

What he said. The Kohler version cuts off fuel in the carb to shut the unit down rather than grounding out the ignition as is the case with the Onan and Robin models.

 

I never use switch.
I turn off fuel so no fuel in carburetor.

Dave

 

The welder won't shut off because you aren't done yet. Get back to work...

 

I like 👍 👌

Dave

 

Kohler will go to high idle as part of the shutdown routine. It's perfectly normal.

However............if it goes to high idle, and doesn't shut down..........it's the fuel shutoff solenoid.

I've gone over this here before, and folks always try to say it's not right........until they see a properly working unit go to high idle as it shuts down. It's the way they're made, or the way the board is programmed.

 

https://youtu.be/onSaJ-DupTQ Follow the video to the point he shuts the 250GXT down. Yet another repeat of the video for the non believers.

The shutdown occurs at 11:29 in the video. If your machine goes to fast idle, but won't shut down.............idle solenoid

 

The tractors seem to need a little puff every 3 yrs or so.... any more than that is usually an indication of a leak.