I Have a Volcano SV w/Taiwan 1.8 and it keeps stalling on me when I hit half throttle( runs great before that). I've changed the glow plug, checked the fuel line and needle valve for obstructions, had to replace the exhaust gasket as it fell apart. I've tried richening and leaning out the needle valve with the same results, stalling around half throttle, I was going to mess with the Low speed but wasnt sure where to go with it. I have 5 tanks through it at low speeds on break-in.