hey rico- leave the low speed needle at the factory setting for now. 2.5 turns out on the needle is for breakin.start leaning it 1/8 turn & listen to the engine. keep leaning till you hear the r.p.m. start to pick up.then go 2 clicks at a time. if you go past the sweet spot, it will die, or kill the glow plug.when you get close, pull the plug & read it after each run. good luck. CARTER