I have a John Deere LT133 lawn tractor with a Kohler CV13S, spec 21532 engine one it. Under load and only after warming up it wants to stall. I can prevent the stall by disengaging the blade and halting forward motion. If it does stall, it will restart immediately. I have changed the fuel filter, the air filter and the oil and oil filter. I have removed the carb and soaked it in gasoline for 30 minutes and I cleaned and regapped the spark plug. Any ideas?

Jim, like you I suspect your carb is gummed up. However, I know that "soaking in gas" does not clean a carb. Gas is not hot enough to dislodge the gum it also deposits. You need to use something like SeaFoam or any other good carb cleaner. If you want to avoid another tear down try adding SeaFoam to your gas and run it for a few hours cutting at a higher level.

Thanks for your fast response. I'll give that SeaFoam a try. I've heard of it before but have never tried it. I had also tried spraying the carb with the engine running using carburetor cleaner... to no avail.

I'd cauition spraying carb cleaner into a carb with the engine running, you can direct more junk down to the jets. Disassmble or add SeaFoam to the gas and run

Hey ballengerb1. I just thought I'd let you know what was wrong with the JD we discussed early in May. After removing the carb and cleaning it with SeaFoam... no change. I ran SeaFoam through the tank for an entire tank of gas... no change. Last week I was really tired of taking so long to cut the grass, so I took the covers off the engine and found 4 dead mice and one nest in the cooling fins of the engine. After removing them and reassembling... It runs like it's old self. They hadn't chewed anything, I think that nest just was causing the engine to run too hot. Thanks for you help though.

Glad to hear you are up and running, dang rodents.