My craftsman 15.5HP kohler riding mower turns over

Try cleaning or better yet, replacing the spark plug. Depending on age and how your tractor was maintained, there are other possible causes.

• Gummed up fuel system
• dirty fuel filter
• defective or misaligned armature/magneto (part that causes your plug to spark, igniting the air/fuel mixture, thus starting the engine)
• throttle linkage/cable problems
• low oil level. Some Kohler engines use a low oil shut down sensor which won't allow the engine to run or start to avoid internal damage.
• Mechanical engine problems