Here one for you guys that I am drawing a blank on. It is a Shindaiwa hybrid 4 cycle Brushcutter.
I can't get pass 50% throttle without it dying. I manage 6K max
Rebuild carburetor and replaced fuel filter. Adjusted the valves as they where way out adjustment on the order +.020" when it should .004". What I an see of the cylinder without disassembly it looks good
About the only thing I can I think of is a possible coil failure.