How much Sea Foam to clean the carburetor in my 1989 Honda Helix motor scooter? [SOLVED]

Thanks for the question, Robert. While you can add it to a full tank, I’d wait until you have a low tank of fuel.

Here’s what I’d do: To clean your carburetor’s fuel passageways, add a high concentration of Sea Foam to a low tank of fuel (1:2 ratio of Sea Foam to fuel). If you want to add 8 oz of Sea Foam, wait until you have 16 oz of fuel in the tank. Then, run the engine for about ten minutes, shut it off, and let it soak overnight. Take it for a ride the next morning and the Sea Foam/fuel mixture will have cleaned the carb, supposing that varnish restriction is causing your problem. Sea Foam Motor Treatment works very well to liquefy and clean heavy gum/varnish in carburetors. Sea Foam is always safe in all types of engines and it doesn’t contain harsh chemicals that could cause any harm. Hope this helps!