Hello Jerry Bevan : First off welcome to the OldMiniBikes and you will find a lot of good information and help if needed ,and we are not too far apart. I am in Beaverton and I have one Trooper and two trail bikes that have the James two speed gear box that was used on Troopers. And one extra gearbox and rear wheel from a cut up trooper. I sure would like to see more pictures of both of your machines.
Steve