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Compression on both cylinders cold is 37 psi. Ignition is rebuilt with good spark on both cylinders. Welch plug on carb was r/r when rebuilding carb. Cleaned and blew out all passages with compressed air. When twist grip throttle position is at “start”, motor starts right up and is running at a good clip. As soon as I start turning throttle to sloe, the engine dies. High and low speed needles are set to 3/4 and 1-1/2 respectively. When carb. throttle lever is lines up with index on ignition advance plate, throttle is in between “shift” and “start” position. I acquired the motor with a boat I bought. I don’t know how long ago motor was run.