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STARTING AND BREAK-IN
STARTING AND BREAK-IN
FUEL
Always use the recommended fuel as stated
below. Also, be sure to use new gasoline the
day of a race.
Use only unleaded gasoline. The use of
leaded gasoline will cause severe damage
to the engine internal parts such as valves,
piston rings, and exhaust system, etc.
Your Yamaha engine has been designed to use
premium unleaded gasoline with a pump oc-
tane number [(R+M)/2] of 91 or higher, or a re-
search octane number of 95 or higher. If
knocking (or pinging) occurs, use a gasoline of
a different brand.
• For refueling, be sure to stop the engine
and use enough care not to spill any fuel.
Also be sure to avoid refueling close to a
fire.
• Refuel after the engine, exhaust pipe, etc.
have cooled off.
Gasohol (For USA and Canada)
There are two types of gasohol: gasohol con-
taining 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 vehicle performance problems.
HANDLING NOTE
Never start or run the engine in a closed ar-
ea. The exhaust fumes are poisonous; they
can cause loss of consciousness and death
in a very short time. Always operate the ma-
chine in a well-ventilated area.
• Unlike a two-stroke engine, this engine
cannot be kick started when the throttle is
open because the kickstarter may kick
back. Also, if the throttle is open the air/
fuel mixture may be too lean for the engine
to start.
• Before starting the machine, perform the
checks in the pre-operation check list.
AIR FILTER MAINTENANCE
According to "CLEANING THE AIR FILTER
ELEMENT" section in the CHAPTER 3, apply
the foam-air-filter oil or its equivalent to the ele-
ment. (Excess oil in the element may adversely
affect engine starting.)
STARTING A COLD ENGINE
1. Inspect the coolant level.
2. Shift the transmission into neutral.
3. Pull the starter knob/ idle screw "1" to its full
length.
Use the starter knob/ idle screw below an air
temperature of 15°C (59°F).
4. Push the kickstarter down lightly with your
foot until resistance is felt.
5. With the throttle fully closed, fold out the
kickstarter lever, move it down lightly with
your foot until the gears engage, and then
push it down smoothly but forcefully.
Do not open the throttle while kicking the
kickstarter crank. Otherwise, the kickstarter
crank may kick back.
If the engine fails to start, give the kickstarter 10
to 20 slow kicks at full throttle in order to clear
the engine of the rich air-fuel mixture retained in
it.
Recommended fuel:
Premium unleaded gasoline only