If this is an old split frame model, good luck. The Bachmann motors are not the best and often break when you pull the split frame apart. It is a well known problem. I am sure Bachmann didn't plan it this way, but once they have committed to a design or a mfg. it is a hard and expensive thing to change.
If you are lucky enough to have a newer frame, you can mount just about any manufacturers can motor in place. They usually have their own flywheels attached. If you are trying to use any flywheel that is not machined metal, you will ALWAYS have a big risk of having vibration issues.
Look up how to make an HO gear puller or buy one from NWSL. They are worth the money. So is a driver quarterer. Both tools are an absolute must if you plan on replacing gears on steam engines.
If you are lucky enough to have a newer frame, you can mount just about any manufacturers can motor in place. They usually have their own flywheels attached. If you are trying to use any flywheel that is not machined metal, you will ALWAYS have a big risk of having vibration issues.
Look up how to make an HO gear puller or buy one from NWSL. They are worth the money. So is a driver quarterer. Both tools are an absolute must if you plan on replacing gears on steam engines.