How much Sea Foam Motor Treatment should I add in a scooter that did not drive for 10 years? [SOLVED]

Good question, Olivier. You’ll want to add a strong cleaning concentration to take care of any fuel gum and varnish in that has formed while it’s sitting.

Here’s what I’d recommend:

• Drain any old fuel completely
• Add fresh fuel mixed with a strong cleaning concentration of Sea Foam (up to about a 2:1 ratio of gas to Sea Foam for cleaning. 8 oz of gas and 4 oz of Sea Foam is a good amount for a scooter).
• Start and run the engine as best you can to draw the treated fuel into the carburetor. Let it idle for a few minutes.
• Let it soak overnight (or longer)
• Then start it up and take it for a ride. The Sea Foam will continue to clean as it burns through the treated fuel. Once it’s running and smoothed out, add fresh fuel. You can add 1 oz of Sea Foam per gallon of fuel in every tank if you like. That’ll help prevent gum and varnish from forming and keep it running strong.

Hope that helps and let me know if you have any other questions!