My M20 came with a magneto housing which sadly missed it's innards .
I want to modify a jap electronic ignition to provide the sparks ,as is often done here in Thailand . I do however want to keep the manual advance & retard .
I know to set the ignition at 7/16 "/ 11,1 mm BTDC in fully advanced position . But can anyone tell me what the correct position of the piston is when with the ignition retarded ,i.e. when starting the engine ? Bike will run total loss, i.e no dynamo or similar .
