2001 YAMAHA WARRIOR 350 check engine

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EBU00015
CONTENTS
LOCATION OF THE WARNING AND
SPECIFICATION LABELS ....................... 1-1
SAFETY INFORMATION ........................ 2-1
DESCRIPTION AND MACHINE
IDENTIFICATION .................................... 3-1
Identification number records........... 3-3
Key identification number ................. 3-5
Vehicle identification number ........... 3-5
Model label ......................................... 3-7
CONTROL FUNCTIONS ......................... 4-1
Main switch ........................................ 4-1
Indicator lights.................................... 4-3
Handlebar switches............................ 4-5
Throttle lever ...................................... 4-9
Speed limiter .................................... 4-11
Clutch lever ....................................... 4-13
Front brake lever .............................. 4-13
Rear brake pedal .............................. 4-15
Parking brake .................................... 4-17
Shift pedal......................................... 4-21Drive select lever...............................4-21
Fuel tank cap .....................................4-23
Fuel cock ............................................4-23
Starter (choke) ...................................4-25
Seat ....................................................4-27
Front shock absorber adjustment....4-29
Rear shock absorber adjustment .....4-31
PRE-OPERATION CHECKS .....................5-1
Front and rear brakes .........................5-5
Fuel.......................................................5-9
Engine oil ...........................................5-13
Chain ..................................................5-15
Throttle lever .....................................5-17
Fittings and Fasteners ......................5-17
Lights .................................................5-17
Switches ............................................5-17
Battery................................................5-19
Tires ...................................................5-19
How to measure tire pressure .........5-23
Tire wear limit ...................................5-25
1234
5

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OPERATION ........................................... 6-1
Starting a cold engine ....................... 6-3
Starting a warm engine ..................... 6-9
Warming up ........................................ 6-9
Drive select lever operation and
reverse driving ............................... 6-11
Shifting ............................................. 6-15
To start out and accelerate .............. 6-17
To decelerate .................................... 6-21
Engine break-in ................................ 6-23
Parking .............................................. 6-27
Parking on a slope ........................... 6-29
Accessories and loading ................. 6-31
RIDING YOUR ATV ................................ 7-1
Getting to know your ATV ................. 7-3
Ride with care and good
judgement ........................................ 7-5
Be careful where you ride ............... 7-27
Turning your ATV ............................ 7-39
Climbing uphill ................................. 7-45
Riding downhill ................................ 7-55
Crossing a slope ............................... 7-59
Crossing through shallow water .... 7-63
Riding over rough terrain ................ 7-67Sliding and skidding ........................ 7-69
What to do if ..................................... 7-73
What to do ........................................ 7-73
PERIODIC MAINTENANCE AND
ADJUSTMENT ....................................... 8-1
Owner’s manual and tool kit ............. 8-3
Periodic maintenance/lubrication ..... 8-7
Engine oil .......................................... 8-15
Spark plug inspection ...................... 8-25
Air filter cleaning.............................. 8-29
Carburetor adjustment .................... 8-33
Idle speed adjustment ..................... 8-35
Valve clearance adjustment ............ 8-37
Throttle lever adjustment ................ 8-37
Front and rear brake pad
inspection ....................................... 8-39
Inspecting the brake fluid level ....... 8-41
Brake fluid replacement .................. 8-45
Front brake lever free play
adjustment ..................................... 8-47
Rear brake adjustment .................... 8-49
Parking brake adjustment ............... 8-51
Clutch lever free play adjustment... 8-55
Drive chain slack check.................... 8-57
Drive chain slack adjustment .......... 8-59
67
8

4-9
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1. Throttle lever
1. Levier d’accélération
1. Palanca de aceleración
EBU00063
Throttle lever
Once the engine is running, movement of the
throttle lever will increase the engine speed.
Regulate the speed of the machine by varying
the throttle position. Because the throttle is
spring-loaded, the machine will decelerate,
and the engine will return to an idle any time
the hand is removed from the throttle lever.
Before starting the engine, check the throttle to
be sure it is operating smoothly. Make sure it
returns to the idle position as soon as the lever
is released.
WARNING

Malfunction of the throttle could make it diffi-
cult to speed up or slow down when you need
to. This could cause an accident. Check the op-
eration of the throttle lever before you start
the engine. If the throttle does not work
smoothly, check for the cause. Correct the
problem before riding the ATV or consult a
Yamaha dealer.

5-1
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EBU00113
PRE-OPERATION CHECKS
Before using this machine, check the following points:
ITEM ROUTINE PAGE
Brake
• Check operation, free play, fluid level and fluid leakage.
• Fill with DOT 4 (or DOT 3) brake fluid if necessary.5-5 ~ 5-7,
8-39 ~ 8-49
Clutch
• Check operation, condition and lever free play. 8-55
Parking brake
• Check operation, condition and cable slack. 8-51 ~ 8-53
Fuel
• Check fuel level.
• Fill with fuel if necessary.5-9 ~ 5-11
Engine oil
• Check oil level.
• Fill with oil if necessary.5-13 ~ 5-15,
8-15 ~ 8-23
Drive chain
• Check chain slack and condition.
• Adjust if necessary.5-15, 8-57 ~ 8-61
Throttle
• Check for proper throttle cable operation. 5-17, 8-37
Wheels and tires
• Check tire pressure, wear and damage.5-19 ~ 5-25,
8-69 ~ 8-71
Fittings and Fasteners
• Check all fittings and fasteners. 5-17
Lights
• Check for proper operation. 5-17, 8-83 ~ 8-89
Battery
• Check fluid level.
• Fill with distilled water if necessary.5-19, 8-73 ~ 8-79

5-15
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CAUTION:

Be sure to use motor oils that do not contain
anti-friction modifiers. Passenger car motor
oils (often labeled “Energy Conserving”) con-
tain anti-friction additives which will cause
clutch and/or starter clutch slippage, resulting
in reduced component life and poor engine
performance.
EBU00498
Chain
Check the general condition of the chain and
check the chain slack before every ride. Lubri-
cate and adjust the chain as necessary. (See
pages 8-57 ~ 8-61 for details.)Oil quantity:
Total amount:
3.2 L
Periodic oil change:
2.4 L
With oil filter replacement:
2.5 L

5-17
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EBU00151
Throttle lever
Check to see that the throttle lever operates
correctly. It must open smoothly and spring
back to idle position when released. Repair as
necessary for proper operation.
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Fittings and Fasteners
Always check the tightness of chassis fittings
and fasteners before a ride. Take the machine
to a Yamaha dealer or refer to the Service Man-
ual for correct tightening torque.
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Lights
Check the headlight and taillight to make sure
they are in working condition. Repair as neces-
sary for proper operation.
EBU00155
Switches
Check the operation of the headlight switch,
engine stop switch and any other switches. Re-
pair as necessary for proper operation.

6-9
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EBU00180
Starting a warm engine
To start a warm engine, refer to the “Starting a
cold engine” section. The starter (choke)
should not be used. The throttle should be
opened slightly.
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Warming up
To get maximum engine life, always warm up
the engine before starting off. Never accelerate
hard with a cold engine! To see whether or not
the engine is warm, check if it responds to the
throttle normally with the starter (choke)
turned off.NOTE:

When the parking brake is used, engine speed
is limited to 2,300 r/min. Be sure the parking
brake is released before moving the throttle le-
ver. Otherwise, the engine will misfire, pre-
venting normal operation.

8-7
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EBU00262
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.