3-5
INSTRUMENT AND CONTROL FUNCTIONS
3
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 gasoline of a different
brand or premium unleaded fuel. Use
of unleaded fuel will extend spark
plug life and reduce maintenance
costs.
Gasohol
There are two types of gasohol:
gasohol containing ethanol and that
containing methanol. Gasohol con-
taining 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 vehicle performance
problems.
EAU03050
Fuel cock
The fuel cock supplies fuel from the
tank to the carburetor while filtering it
also.
The fuel cock has three positions:
OFF
With the lever in this position, fuel will
not flow. Always return the lever to
this position when the engine is not
running.
1. Arrow mark positioned over “OFF”
EAU02955
Fuel tank breather hose
Before operating the machine:
8 Check the fuel tank breather
hose connection.
8 Check the fuel tank breather
hose for cracks or damage, and
replace it if damaged.
8 Make sure that the end of the
fuel tank breather hose is not
blocked, and clean it if neces-
sary.
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