It might be a 70cc, sometimes they lie. It's a 12v system, but never put move than a 2 amp charge on it. All you need a is a kill switch, other than it has no kick start, it will run with out a battery. What numbers or letters are at the bottom of the black cylinder? A 19mm carb would be more than enough for a stock engine. My 110cc X18 came w/ a 19mm.