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rings, as well as to the exhaust system.
Your Yamaha engine has been designed to use
regular unleaded gasoline with a pump octane
number [(R+M)/2] of 86 or higher, or a research oc-
tane number of 91 or higher. If knocking or pinging
occurs, use a different brand of gasoline or premi-
um unleaded fuel. Unleaded fuel will give you long-
er spark plug life and reduced maintenance cost.
Gasohol
There are two types of gasohol: gasohol contain-
ing ethanol and that containing methanol. Gasohol
containing ethanol can be used if the ethanol con-
tent does not exceed 10%. Gasohol containing
methanol is not recommended by Yamaha be-
cause it can cause damage to the fuel system or
ATV performance problems.
EWB00270
EBU18820
Fuel cock
The fuel cock supplies fuel from the tank to the car-
buretor while also filtering it.
The fuel cock lever positions are explained as fol-
lows and shown in the illustrations.
WARNING
POTENTIAL HAZARD
Improper care when refueling.
WHAT CAN HAPPEN
Fuel can spill, which can cause a fire and se-
vere injury.
Fuel expands when it heats up. If the fuel
tank is overfilled, fuel could spill out due to
heat from the engine or the sun.
HOW TO AVOID THE HAZARD
Do not overfill the fuel tank. Be careful not to
spill fuel, especially on the engine or exhaust
pipe. Wipe up any spilled fuel immediately.
Be sure the fuel tank cap is closed securely.
Do not refuel right after the engine has been
running and is still very hot.