Hi , just brought one of these back to life after standing for several years... Pete is correct , there is a microswitch under the seat, , in the gear box (has to be in neautral) , behind the brake/clutch pedal(must be fully depressed. If you lift the seat and disconnect the black connector block , the way it is designed it will automatically bypass the switch hence putting you in a position to trouble shot each ne individually. The other problem you may encounter if the mower has been stood outside is the your spark is weak due to rust on the flywheeel. This is where the coil picks up the spark. You will need to take the cover off the top of the engine 4xnuts and some wiggling ..then sand the side of the flywheel and remove the coil and ensure all the surfaces that contact the flywheel are clean ..sanded once again... then replace the coil with a 3mm gap(cereal box is a good spacer 4 this) to the flywheel..replacement of cover is reversal of taking off.. You will be amazd how wel your mower runs after this...gOOD Luck
Spud
May 2010