no thats not true i ran in my os tr without the glow plug warmer on. "I THINK" the bottom end is to rich, try and lean the bottom end screw 1/8th of a turn till it has a better or more stable idle.

also what plug are you using? OS A3 would be ideal to run it in with as its a hot plug.

also with the glow plug warmer still on how does it idle? is the rpm very low? if so maybe just bump up the idle speed a little try turnning the idle screw inwards 1/4 to 1/2 of a turn

let us all know how you go