Motorman, do you have any articles or write ups on how to select the correct glow plugs? This isn't a "What's the best plug..." type question. I understand (I think) what a warmer or cooler glow plug does, why it does it, how it affects timing etc, but i think i'm having trouble selecting the right one. Info i'm looking for is like characteristics to look for that would "tell" me that i'm using too hot/cold of a plug. Today for example i was totally short on run time. My engine usually makes 5 minutes no problem. but at barely 4:15 today i was dry for example. It Also ran pretty hot. I'm in Miami fl, today was in the upper 70's with pretty dry contitions. I ran a 7tf plug. I'm running a JP with a new piston/sleeve touched up by Maxy & 30% Maxy's Fuel. Any help is greatly appreciated.