Mower stops and cant be started until it has cooled down. No power to spark plug. Condensor is okay as even with new one on still the same. Found some earth wires melted conecting ignition switch but no power to ignition switch. Can start and run the mower by jump to ignition wires. Took ignition switch off no power to switch. Switch has now fallen apart. Tried some of the wires near the engine for power and no luck. Can start the mower from the battery connection in the engine compartment. Would there be a problem with the wiring under the flywheel where I cant see. It stops when it gets hot and no power to the spark plug which I believe means there is an earth short there somewhere. The safety switches have long ceased to work in the engine compartment and have been using the mower by starting with the plugs in and them removing them to run the machine. Can you help?