I don't use it normaly but I did try it a couple of times. Its like the old british bikes they used them it lets extra raw fuel in the carb to help it start when its cold I just use the choke. This tickler does make a sort of a vent to the float as its not air tight at all.

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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