Gasolines Containing Alcohol; To Avoid This Please Strictly Follow These Recommendations - Honda HP500H Owner's Manual

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NOTE: 
Gasoline spoils very quickly depending on factors such as light
exposure, temperature and time.
In worst cases, gasoline can be contaminated within 30 days.
Using contaminated gasoline can seriously damage the engine
(carburetor clogged, valve stuck).
Such damage due to spoiled fuel is disallowed from coverage by the
warranty.

To avoid this please strictly follow these recommendations:

• Only use specified gasoline (see page 13).
• Use fresh and clean gasoline.
• To slow deterioration, keep gasoline in a certified fuel container.
• If long storage (more than 30 days) is foreseen, drain fuel tank and
carburetor (see page 49).

Gasolines containing alcohol

If you decide to use a gasoline containing alcohol (gasohol), be sure its
octane rating is at least as high as that recommended by Honda.
There are two types of ''gasohol'': one containing ethanol, and the
other containing methanol.
Do not use gasohol that contains more than 10% ethanol.
Do not use gasoline containing more than 5% methanol (methyl or
wood alcohol) and that does not also contain co-solvents and corrosion
inhibitors for methanol.
NOTE:
• Fuel system damage or engine performance problems resulting from
the use of gasoline that contains more alcohol than recommended is
not covered under the warranty.
• Before buying gasoline from an unfamiliar station, first determine if
the gasoline contains alcohol, if it does, find out the type and
percentage of alcohol used.
If you notice any undesirable operating symptoms while using a
particular gasoline. Switch to a gasoline that you know contains less
than the recommended amount of alcohol.
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