The SuperTigre series usually can be tuned for gasoline "as is" with no more than the installment of an electronic ignition, due to the design of the SuperTigre carb allowing for a decent midrange tune. They are the only brnd, to my knowledge, that can be run on gasoline with only adjustments, no modifications.
Tuning the midrange is done by loosening up the two tiny cheesehead screws on the fuel inlet side of the carb, and turning the brass insert that holds the fuel nipple and the main needle. Clockwise is leaner, anticlockwise is richer.
Muffler pressure is advised, with a "craptrap" dirt collector between muffler and fuel tank to prevent dirt from entering the tank.

I can sell you a solenoid set, but I feel that would be an indecent course of action if your engine does not really need it.

Here are a few SuprTigres that I converted to gasoline: