C
First start of the season. Hard to get started, will idle after warm up it dies as soon as I throttle to 4500RPMS, I can barely keep it going by engaging the choke. Have to choke it to restart. I've removed the carburetor and cleaned the jets (they were clean). Fuel screws are set at 1.5 turns. I reinstalled the carbs and its still doing it. Pulled the intake manifolds and reed valves out, they look fine. Sled ran great last season, I used stability and fogged the engine in May. Any help would be greatly appreciated