Small Engine Troubleshooting Problems? Ask a Mechanic Now.
With twin engine I always run a cylinder balance test. Loosen the spark plug wires and with engine idling, remove one wire at a time, engine should continue to run. If it dies when either wire is removed, the opposite cylinder is not firing. If both ok, Have the valves ever been adjusted? Valves may be too tight, causing misfire when hot. Lash needs to be .004 to .006 inch.