[rotorwrench]

If the tank needs work, a boat tank or other fuel supply can be used to see if fuel delivery is the problem. I'd do a compression check to see if there is a valve hung open or not. Reviving an engine that has set up for extended periods can be a real challenge sometimes but at least it's a simple design. You can leave the generator out of the circuit for testing and use a battery charger. I wonder if the amp meter is an original or a reproduction. The reproductions are crap and have no sensitivity. An original is very sensitive to any movement when shaking it with your hand. With repros, the needle will rarely move much.