Kohler K301S 12hp problems

[yzf450motoxrider 20]

I have a kohler 12hp engine in a 312A that's having issues. It will run with the choke on and throttle all the way up. If the choke is turned off it will die. After it warms up it will run without the choke on but only at the lowest throttle setting.

Any suggestions?

Thanks

[slammer302 2,156]

you are not getting enough fuel i would start by cleaning the carb

[Fordiesel69 271]

I am a firm beleiver of total fuel system maint when you are having trouble like this. 

Flush fuel tank, replace the fuel cock as it has a filter screen that is next to impossible to clean.

Replace fuel line if you suspect any issues with it, or if it looks aged.

Check fuel flow from fuel pump while cranking.  It should pulse fuel, put your finger over it and see if it can build a little pressure.  If not, replace pump.


Now you have ruled out proper fuel flow (TO) the carburetor.  If it still acts up, a carb cleaning / rebuild should be done.  Soak overnight in chem dip if you can.

[yzf450motoxrider 20]

pulled the fuel line off the intake on the carb turned the engine over and the flow was good so I cleaned out the carb. That did it works great now. It looked like there was some junk in the needle seat that was reducing the fuel flow.

[rmaynard 16,193]

Thanks for letting us know what fixed it. It's always helpful to others having the same problem. A simple search and they find an answer.