Are there any electronically minded wizards out there, as would just like to know why this happened when replacing a single cylinder engine with a twin cylinder that uses two ignition units, as most people know to stop an engine with magneto ignition it is just grounded to earth. Now doing my engine swap all the original wiring for alternator and ignition were the same fittings as same make of engine, I was very pleased with how easy my conversion went, connected every thing up turned the key and engine started and so pleased just how silent and smooth, must fit the deck and give it a go, and went to stop it, funny it kept running but sort of lumpy at idle, opened the throttle and ran rougher than ever, so easy to short the ignition with a screwdriver, there are few wires to trace on the ignition switch, live feed, one to deck clutch switch, one to alternator and one to starter solenoid, no earth so what happens, ignition off and it was connected to the starter solenoid how very odd, so had to fit a relay that was simple, Its a good job I did as friend was trying to find what had gone wrong with his ignition switch and fed live down the stop wire that blew both ignition units, very expensive and had to take the engine out to remove the cowling to gain access, Photos A must fit is a 15 amp fuse unit top left,the by-metal overload is not fail safe, if fuse blows with relay engine stops, as had a voltage control fail dead short, note lifted so air is blown under, new ignition switch centre, relays bottom right.
