ORIGINAL: clockshop
the engine runs the same from 3 turnes of the needle valve to 1 turn from falling out if you pinch the fuel line it just quites
There must be something other than the needle restricting the flow of fuel. Any engine should run extremely rich even without any muffler pressure with the needle wound out that far. Kinked fuel line, fuel passages not drilled or aligned properly, bit of dirt in the passages. Or possibly the idle needle is way too lean and restricting the orifice?