ok, this is my experience... i use hot plug.
i open up like more than 1mm gap the carb. i pull the pressure fuel hose from pipe & blow. i stop when the fuel reaches the carb. i peak my glow starter & push it on the starter box, it normally start. at least start and if died afterward..meaning the tuning problem. mine 2T HSN, LSN 4T.
anything else...u shud open the engine to check.

this i use on my truggy(no pullstart).