Small Engines (Lawn Mowers, etc.): craftman riding lawn mower mdl#917.270821, magnito, poor connections

Question
runs about 15-20 minutes then dies like the switch turns off. will restart, when let out the clutch brake it will die. or even if i try to engage the blades. i try this a few times and will work for a couple of minutes and start dieing again. repeat procedures and will run for a little while. has new plugs,air and fuel filter, and magnito. magneto was replace for another problem . turned over but no spark, that took care of that. concern is run and dieing problem. like i said if i hold the brake/clutch in will run fine.???

Answer
Clean the connections on all the safety switches.  One of the safety switches is causing the problem.  Had a problem similar to yours once.  Ended up soldering the wires directly to the seat safety switch...finally fixed the problem.

Disconnecting and reconnecting the safety connectors may fix the problem but some contact cleaning and a little bulb grease may help poor connections.

Eric