if its firing now as the way you are describing it you need to turn in the idle speed screw on the carb to increase the idle speed or hold the throttle open to get it to run and while blipping the throttle to keep it form dieing adjust the idle speed on the carb until it will idle.

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norms-iron-works.tripod.com
motor assisted bicycle engine headlights that work off of your white power wire. check it out