My Lawnmower Forum banner
1 - 3 of 3 Posts

·
Registered
Joined
·
8 Posts
Discussion Starter · #1 ·
I posted this once before under STX38 Running Trouble..I have an STX38 with a black deck. My mower starts fine and runs perfect except that once I go over half throttle the engine runs like it wants to blow up. I checked the carb (someone mentioned the butterfly valve). Seems fine. Then I checked the linkage for the governor (Another gentleman suggested this). It seems okay. Unless I am missing something on the linkage thing. Up to know if anyone has a suggestion please do not hesitate to tell me. If there is nothing up to now, then the last thing suggested was an inner governor issue. Is there anywhere I can get a schematic or drawing or help going through this? I am not relying on this mower for mowing so I kind of want to do this myself..Any input is greatly appreciated..
 

·
Premium Member
Joined
·
583 Posts
Please post the Model# and Serial# of the engine on your tractor. With that info it shouldn't be a problem to find an engine manual with diagrams in it. Whether it would have a close diagram of the inside of the governor I don't know, but it would be worth a try if you don't already have a manual for the engine.
 

·
Administrator
Joined
·
7,359 Posts
Kohler has a service manual in a PDF that you can download of the 12.5 Command. It includes the throttle and governor linkage and how it should all be connected and adjusted, so a worth while look. I wasn't able to link the PDF to here, but here is the Google search for it. You will find it in the second link listed: kohler command throttle schematic - Google Search

Otherwise, you can search for it by the model # on their website, kohlerengines.com

Other things to check for (assuming the carb is clean and functioning properly) is fuel flow. Confirm the fuel filter is not partially clogged, it happened once on my STX due to the original fuel hoses cracking and clogging up the small filter. You could also install a spark tester and see if it is losing spark in the higher rpm's, but before that, I'd rule out the fuel, carb and questionable linkage setup first.
 
1 - 3 of 3 Posts
Top