Hi Doug,
I'm not going to go into too much detail but as these are magneto it is very simple. Sounds like you have some idea as you say the micro switches are ok. First thing is to check that the battery is charged. Then check that the battery leads are good and connected. Remove them and clean them. The negative battery lead from the battery to the chassis, the lead from the body of the motor to the chassis, it may not have this lead but check for it and make sure the connections are good and clean. Then you have to check the positive lead from the battery to the solonoid and the lead from the solonoid to the starter motor. If these are all good then you need to check the wire from the ignition switch ( S ) to the solonoid, this will only be a smaller wire. If all the above tests out the when you turn the switch to start you should have power to the solonoid and the solonoid should snap shut and put power directly to the starter motor. Let us know how you get on
