A True Low Dollar Backyard Build

Picked up a battery today. Dropped it in place, hooked it up and turned the key to "run". Fuel pump kicks on - good deal. Let's see if she'll fire off. Had Jake tun the key, had Josh on video duties and that's me at the front. I raised Jake well. Before turning the key, he asked - Oil? Coolant? Fire extinguisher? Check, check and check.
Dribbled just a little gas down the carb and let her rip.
Sort of......... Fired right up, and died when let go of the key. Fired right back up and did when let go of the key..hmmmmm. tried another ballast resistor, even tho this one tested good. Same result.
Other than that, the motor sounded good. No odd noises, cranks easy enough. Runs very well as long as you hold the key in start.