Small Engine Troubleshooting Problems? Ask a Mechanic Now.
Welcome to JUST ANSWER small engines, let me try to help you !! I don't know it all, but maybe together we can get you a satisfactory answer!
Twin engine, so run a cylinder test. Loosen the spark plug wires and with engine idling, remove one plug wire at a time, engine should continue to run. If engine dies when either wire is removed, the opposite cylinder is not firing. If it does, check for spark and compression on the dead cylinder. The loss of power would be engine only firing on one cylinder!
Did you see my response and run the test?