How often should I use Sea Foam in a 4 stroke motorbike? [SOLVED]

Good question, Dan.

Here’s what I’d do: once a year, wait until you have a low tank of fuel and add a high concentration of Sea Foam Motor Treatment (up to a 2:1 ratio of gas to Sea Foam. 32 oz of fuel and 16 oz of Sea Foam). Then, ride it until about empty before refueling. The high concentration will do a great job cleaning any fuel residue or deposits.

If it’s sitting for a while between uses, you could add 1 oz of Sea Foam per gallon of fuel to every tank. That will prevent gum and varnish from forming while it sits, as well as preserve ignition vapors and prevent the fuel from degrading.