I'll give you a cautionary note here ....
Not using a generator for many years is bad for the power-head. The engine would be fine, but the power generator itself needs to be exercised. If left to sit for long periods of time, the magnets can degrade low enough that they won't self-excite the field. When this happens the generator won't make power even if the engine starts and runs fine.
There is a "bump start" method to touch off the stator excitement, but there are two caveats:
- it can be dangerous if you don't know what you're doing
- it's a PITB because every time you need the generator you have to do this, and you need a decent 12v battery, which means you have to drag something else out at a time when power is of the essence