take the diaphram cover off along with the diaphram, there's a little lever that's got a spring on one end, pry up the end with the spring a very slight amount, that will make the carb pump more fuel, I ran into that problem with a homie blower lately, I could either get it to idle or run full throttle, not both, and noticed that the needle (single needle) was out 2 turns or so, after I pried out the metering lever a little it ran great...