not started for 16 years lol i would not worry till you put a couple of tank full,s of unleaded through it , by that time it would be the least of your worrys , but if i was to trouble shoot having not trouble shot a one liter enginge with a amal carb i would say its a shrivelled gasket on the accelerator pump but i cant remember if a amals got one but i would get a new gasket set and floats and carry a co2 can forawhile hot crotch is nice for the first thirty seconds on a cold night