After sitting for a long time. Got it running. A loud metal flapping sound. from one side of the engine. Like cards in bicycle spokes. My friends dad said it sounded like a stuck hydraulic lifter, or a stuck valve or loose valve seat. The first test, fix. Add seafoam to oil, get engine to running temp, add seafoam to vacuum nipple on carb. Luckily was a gummed up lifter. Noise got smaller till went away completely. Amazing inventive fix. FYI. Also during have to idle fast enough to have enough gas to burn with all the seafoam going in. Filled the garage with burning seafoam smoke. Was totally cool cause it totally worked!