2001 YAMAHA WARRIOR 350 engine

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Select a large, flat area off-road to become fa-
miliar with your ATV. Make sure that this area
is free of obstacles and other riders. You
should practice control of the throttle, brakes,
shifting procedures, and turning techniques in
this area before trying more difficult terrain. Al-
ways avoid riding on paved surfaces: the ATV
is designed for off-road use only, and handling
maneuvers are more difficult to perform on
pavement.
Set the parking brake and follow the instruc-
tion on page 6-3 to start the engine. Once it has
warmed up you are ready to begin riding your
ATV. As you get on the ATV, be sure not to ac-
cidentally move the shift pedal. Remember
that the engine and exhaust pipe will be hot
when riding and afterwards; do not allow skin
or clothing to come in contact with these com-
ponents.

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With the engine idling, pull the clutch lever to
disengage the clutch and shift into 1st gear,
and then release the parking brake. Open the
throttle gradually, and at the same time, re-
lease the clutch lever slowly. Once the ATV has
attained adequate speed, release the throttle
lever and at same time, quickly pull in the
clutch lever and shift into 2nd gear. Open the
throttle part way and gradually release the
clutch. Use this same procedure as you move
into the higher gears. Be sure to coordinate the
use of the throttle and shift pedal properly. If
the throttle is applied too abruptly or if the
throttle is not released during shifting, or if the
shift pedal is not released before applying the
throttle, the front wheels may lift off the
ground resulting in a loss of directional con-
trol. Avoid higher speeds until you are thor-
oughly familiar with the operation of your ATV.
WARNING
Always open the throttle gradually and re-
lease the clutch lever slowly. Otherwise, the
machine could wheelie which would increasethe chance of an accident.

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CAUTION:Do not shift gears without releasing the throt-
tle. Damage to the engine or drive train mayoccur.
When slowing down or stopping, release the
throttle and apply the brakes smoothly and
evenly. As you slow down, shift to a lower
gear. Be sure that the engine has sufficiently
slowed before engaging a lower gear. Improp-
er use of the brakes or shifting can cause the
tires to lose traction, reducing control and in-
creasing the possibility of an accident.
WARNING
Make sure the engine has sufficiently slowed
before shifting to a lower gear. Engaging a
lower gear when the engine speed is too highcould cause the wheels to stop rotating.

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RIDING DOWNHILL
When riding your ATV downhill, shift your
weight as far to the rear and uphill side of the
ATV as possible. Move back on the seat and sit
with your arms straight. Choose a low gear
which will allow the engine compression to do
most of the braking for you. Improper braking
may cause a loss of traction.
Use caution while descending a hill with loose
or slippery surfaces. Braking ability and trac-
tion may be adversely affected by these surfac-
es. Improper braking may also cause a loss of
traction.
Whenever possible, ride your ATV straight
downhill. Avoid sharp angles which could al-
low the ATV to tip or roll over. Carefully choose
your path and ride no faster than you will be
able to react to obstacles which may appear.

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PERIODIC MAINTENANCE AND
ADJUSTMENT
Periodic inspection, adjustment and lubrica-
tion will keep your machine in the safest and
most efficient condition possible. Safety is an
obligation of the machine owner. The most im-
portant points of machine inspection, adjust-
ment and lubrication are explained on the
following pages.
WARNING

Never service an engine while it is running.
Moving parts can catch clothing or parts of the
body, causing injury. Electrical components
can cause shocks or can start fires. Turn off the
engine when performing maintenance unless
otherwise specified. Have a Yamaha dealer
perform service if you are not familiar with
machine service.

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PERIODIC MAINTENANCE/LUBRICATION
ITEM ROUTINEINITIAL EVERY
1
month3
months6
months6
months1
year
Valves*
• Check valve clearance.
• Adjust if necessary.
Spark plug
• Check condition.
• Adjust gap and clean.
• Replace if necessary.
Air filter
• Clean.
• Replace if necessary.Every 20~40 hours
(More often in wet or dusty areas.)
Carburetor*
• Check idle speed/starter operation.
• Adjust if necessary.
Crankcase breather
system*
• Check breather hose for cracks or damage.
• Replace if necessary.
Exhaust system*
• Check for leakage.
• Retighten if necessary.
• Replace gasket if necessary.
Fuel line*
• Check fuel hose for cracks or damage.
• Replace if necessary.
Engine oil
• Replace (Warm engine before draining).
Engine oil filter
• Clean.
• Replace if necessary.
Engine oil strainer
• Clean.
Drive chain
• Check and adjust slack/alignment/clean/lube.
Brakes*
• Check operation/fluid leakage/see NOTE page 8-8.
• Correct if necessary.
Clutch*
• Check operation.
• Adjust if necessary.
Wheels*
• Check balance/damage/runout.
• Replace if necessary.

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Engine oil
Engine oil level measurement
1. Place the ATV on a level surface.
2. Warm up the engine for several minutes,
and then stop it.
3. Remove the dipstick, and then wipe it off
with a clean rag. Insert the dipstick in the
filler hole without screwing it in.
NOTE:

Wait a few minutes until the oil level settles be-
fore checking.
4. Remove the dipstick, and then check the
oil level.
5. The oil level should be between the maxi-
mum and minimum marks. If the level is
low, add oil to raise it to the proper level.
CAUTION:

Be sure no foreign material enters the crank-
case.
1. Dipstick 2. Maximum level mark
3. Minimum level mark
1. Jauge 2. Repère de niveau maximum
3. Repère de niveau minimum
1. Varilla de nivel de aceite 2. Marca de nivel máximo
3. Marca de nivel mínimo

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1. Drain bolt 2. O-ring
3. Compression spring 4. Oil strainer
1. Boulon de vidange 2. Joint torique
3. Ressort de compression 4. Crépine à huile
1. Perno de vaciado 2. Junta tórica
3. Muelle de compresión 4. Tamiz de aceite
Engine oil replacement and oil filter element
cleaning
1. Place the ATV on a level surface.
2. Warm up the engine for several minutes,
and then stop it.
3. Place a container under the engine.
4. Remove the dipstick, and then remove the
drain bolt to drain the oil.
CAUTION:

When removing the drain bolt, the compres-
sion spring, oil strainer and O-ring will fall out.
Take care not to lose these parts.