I have a 150cc GY6 engine (carburated) in my Lance/SYM PCH, and I usually use 91 octane non-ethanol gas in my 1.3 gallon tank. Through the winter I add Sta-bil to the gas and let it run a few minutes to get it into the entire system. This has worked very well, and my scooter always starts right up each spring.
I plan on adding the Seafoam directly into the tank when I fill up to help clean the carb and maintain the fuel lines. Just wondering how often I should add it to the gas...every fill up? Once a month? Every other month? Every so many miles? I don't want to over-do it, just do it right. Your experience and wisdom is much appreciated. Thanks!