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Most Harley-Davidson® factory installed gas tanks have a coating inside the tank to prevent rusting when stored. If your bike has a tank liner you do not have to fill the tank with gas. Do add the stabilizer, then, come spring, add fresh gas to the existing tank and treat new gas with stabilizer.Stored gasoline can go bad in as little as 60 days. Adding a gasoline stabilizer will keep the gas inside the tank from going bad for up to a year. Run the bike until the stabilized gas is through the carburetor. The treated gas will eventually evaporate cleanly without leaving a heavy residue behind to gum up jets and passages. As possible, drain the carburetor to remove fuel prior to storing, but not all bikes have drain plugs on the float bowl. On models without drain plugs we recommend turning off the fuel valve and running the bike until it is out of gas. The amount of fuel left in the bowl will not be an issue if treated. This is also true for fuel injected motorcycles as well. Of course there is no bowl to drain but the gas will be usable in the spring. It will not be necessary to drain the tank in the spring, just start the bike and ride with the treated fuel as usual.

We recommend to start using gas stabilizer all year long. The new ethanol fuel allows moisture to build up in the gas tank, and does not last as long as older formula gasoline. The newly formulated stabilizers/conditioners not only prevent the gas from going bad, but also break down condensation like a dry gas. This keeps your gas source clean and ready when you are.