It's on the carb
SOURCE: I have 16 hp Craftsman riding mower with a Kohler engine.
It may think you are in reverse and is killing the motor to keep you from backing up with the blade running. Look for switch that is telling it when you are in reverse, maybe it is stuck with grass or other debris. another possibility is that the blades are jammed and they are stalliing the motor. Mines stalls easily when cold.
SOURCE: I have a Craftsman mower with 17 hp Kohler
Do you have to plug the battery in in order to recharge it?
SOURCE: 15 HP OHV Kohler engine with no compression
Have you checked for a bad head gasket?
Check the intake valve springs or the intake valve shafts to be sure they aren't stuck open. Another cause could be excessive carbon build up on the intake valve causing them to not seal.
If you've gone this far, you could try a compression leak down test. If you still have the push rods out, you can use or get an adapter that will allow you to pressurize the cylinder(s) with air by removing the spark plug. Apply 70-80 psi air directly to the cylinder (the cylinder may go to BDC (bottom dead center) but if you don't have any push rods, the valves can't open.
Listen carefully - if you hear air leaking out of the carb, it's a bad intake valve. If you hear air from the exhaust, it's an exhaust valve. If you hear air from the crankcase breather, it's piston rings.
SOURCE: Belt Diagram needed on Craftsman Kohler Command 20 Hp RidingMower
Go to... http://www.searspartsdirect.com/partsdirect/index.action Enter your model #, click enter, then scroll down to the sudcomponent list and click on 'Mower Deck' if it's your blade belt you need to see or 'Ground Drive' for your transmission belt. Hope that helps. Dwain
check the solenoid on the bottom of the carb check for movement and power if it moves and has power open the carb and clean it
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