Do Nitro's Vapor Lock?
I don't have a primer on the engine. It starts and runs great as long as I start it when it's cool. As far as 150F being too cool for vaporization, how much alcohol is in nitro fuel? I agree that the carb nipple should be cooler than the plug/head, but the metal portion of the carb is very hot to the touch at this point. I thought it should be cooler due to the composite carb body. Lines and tank are good, although I don't know how to check them when everything's hot. However, fuel line is cheap, so I'll replace it and see if that helps. Glow plug is good. I've tried the finger over the stinger trick. I can get the fuel to pull into the cylinder (I can hear the bump starter bog down), and I can get it to spark a bit, but never stay running. I got some advice today to pull the plug and totally flood the cylinder. I'll give that a try too.