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 octane number of 91 or higher. If knocking or pinging occurs, use a different brand of gasoline or premium unleaded fuel. Unleaded fuel will give you longer spark plug life and reduced maintenance cost.
Gasohol
There are two types of gasohol: gasohol containing ethanol and that containing methanol. Gasohol containing ethanol can be used if the ethanol content does not exceed 10%. Gasohol containing methanol is not recommended by Yamaha because it can cause damage to the fuel system or ATV performance problems.
EWB00270
WARNING
POTENTIAL HAZARD
Improper care when refueling.
WHAT CAN HAPPEN
Fuel can spill, which can cause a fire and severe 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 4 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.
EBU18820
Fuel cockThe fuel cock supplies fuel from the tank to the carburetor while also filtering it.
The fuel cock lever positions are explained as follows and shown in the illustrations.