fuel YAMAHA YFM350R 2012 User Guide

6-1
6
EBU19881
OPERATION
EBU19901Read the Owner’s Manual carefully before riding
the ATV. If there is a control or function you do not
understand, ask your Yamaha dealer.
WARNING
EWB00631Read the Owner ’s Manual carefully to become
familiar with all controls in order to help pre-
vent any loss of control, which could cause an
accident or injury.EBU20164Starting a cold engine NOTICEECB00150See the “Engine break-in ” section on page 6-6
prior to operating the engine for the first time.1. Set the parking brake.
2. Turn the fuel cock to “ON ”.
3. Turn the key to “ON ” and the engine stop
switch to “”. 4. Shift the transmission into neutral. The neutral
indicator light should come on. If the indicator
light does not come on, have a Yamaha deal-
er check the electrical circuit.
TIPThis model is equipped with an ignition circuit cut-
off system. The engine can be started under the
following conditions.
The transmission is in neutral.
The clutch is disengaged with the shift pedal and
the drive select lever in any position. However, it
is recommended to shift into neutral before start-
ing the engine.5. Use the starter (choke) in reference to the fig-ure:
Position (1):
Cold engine start with ambient temperature
below 5 ° C (40 °F).
Position (2):
Cold engine start with ambient temperature
between 0 ° C (30 °F) and 30 ° C (90 °F).
U1BS62E0.book Page 1 Monday, April 18, 2011 6:43 PM

6-7
6
NOTICEECB00220If any engine trouble should occur during the
engine break-in period, immediately have a
Yamaha dealer check the ATV.EBU20722Parking When parking the ATV, shift into first gear, stop the
engine, apply the parking brake, and then turn the
fuel cock to “OFF ”.
EBU20865Parking on a slope
WARNING
EWB00851Avoid parking on hills or other inclines. Park-
ing on a hill or other incline could cause the
ATV to roll out of control, increasing the
chance of an accident. If you must park on an
incline, place the ATV transversely across the
incline, shift into first gear, stop the engine, ap-
ply the parking brake, and then block the front
and rear wheels with rocks or other objects.
Never park the ATV on hills that are too steep
to walk up easily.1. Bring the ATV to a stop by applying the front
brake, shift into first gear, and then stop the
engine.
2. With the front and rear brakes applied, apply the parking brake.
3. Release the front and rear brakes.
4. Turn the fuel cock to “OFF ”.
1. Parking brake lever (locked position)U1BS62E0.book Page 7 Monday, April 18, 2011 6:43 PM

8-3
8
EBU21743Periodic maintenance chart for the emission control system TIP
For ATVs not equipped with an odometer or an hour meter, follow the month maintenance intervals.
For ATVs equipped with an odometer or an hour meter, follow the km (mi) or hours maintenance inter-
vals. However, keep in mind that if the ATV isn’t used for a long period of time, the month maintenance
intervals should be followed.
Items marked with an asterisk should be performed by a Yamaha dealer as they require special tools,
data and technical skills.NO. ITEM CHECK OR MAINTENANCE
JOB INITIAL
EVERY
Whichev- er comes first month136612
km
(mi) 320
(200) 1300
(800) 2500
(1600) 2500
(1600) 5000
(3200)
hours 20 80 160 160 320
1 *Fuel line 
Check fuel hoses for cracks or other damage, and
replace if necessary. √√√
2 Spark plug 
Check condition and clean, regap, or replace if
necessary. √√√√√
3 *Valves Check valve clearance and adjust if necessary. √ √√√
4 *Carburetor 
Check starter (choke) operation and correct if nec-
essary.
 Check engine idling speed and adjust if neces-
sary. √√√√
5 *Crankcase breather
system 
Check breather hose for cracks or other damage,
and replace if necessary. √√√
U1BS62E0.book Page 3 Monday, April 18, 2011 6:43 PM

8-22
84. Tighten the locknut.
5. Slide the rubber cover to its original position.
EBU24060Valve clearance The valve clearance changes with use, resulting in
improper air-fuel mixture and/or engine noise. To
prevent this from occurring, the valve clearance
must be adjusted by a Yamaha dealer at the inter-
vals specified in the periodic maintenance and lu-
brication chart.
EBU29601Brakes Replacement of brake components requires pro-
fessional knowledge. Brake service should be per-
formed by a Yamaha dealer.
WARNING
EWB02571Operating with improperly serviced or adjust-
ed brakes could lead to a loss in braking ability
and an accident.EBU24130Checking the front and rear brake pads The front and rear brake pads must be checked for
wear at the intervals specified in the periodic main-
tenance and lubrication chart.EBU28790Front brake pads
Each brake pad is provided with two wear indicator
grooves, which allow you to check the brake pad
wear without having to disassemble the brake. To
check the brake pad wear, check the wear indica-
tor grooves. If a brake pad has worn to the point
that a wear indicator groove almost appears, have
a Yamaha dealer replace the brake pads as a set.
1. Rubber cover
2. Throttle lever free play adjusting bolt
3. Locknut
4. Throttle lever free play
3
1 2
4
U1BS62E0.book Page 22 Monday, April 18, 2011 6:43 PM

8-45
8
WARNING
EWB02280Do not smoke when checking the fuel system.
Fuel can ignite or explode, causing severe inju-
ry or property damage. Make sure there are no
open flames or sparks in the area, including pi-
lot lights from water heaters or furnaces.U1BS62E0.book Page 45 Monday, April 18, 2011 6:43 PM

8-46
8
EBU25752Troubleshooting chart
Check the fuel level in
the fuel tank.1. Fuel
There is enough fuel.There is no fuel.
Check the compression.
Supply fuel.
The engine does not start.
Check the compression.
Operate the electric starter.2. Compression
There is compression.
There is no compression.
Check the ignition. Have a Yamaha dealer
check the ATV.
Remove the spark plug
and check the electrodes.3. Ignition
Wipe off with a dry cloth and correct the
spark plug gap, or replace the spark plug.
Have a Yamaha dealer check the ATV.
The engine does not start.
Have a Yamaha dealer
check the ATV.
The engine does not start.
Check the battery.
Operate the electric starter.4. Battery
The engine turns over
quickly.
The engine turns over
slowly.
The battery is good.Check the battery lead connections,
and have a Yamaha dealer charge
the battery if necessary.
DryWet
Open the throttle halfway and operate
the electric starter.
U1BS62E0.book Page 46 Monday, April 18, 2011 6:43 PM

9-2
9
EBU25933Storage Short-term
Always store your ATV in a cool, dry place and, if
necessary, protect it against dust with a porous
cover. NOTICE: Storing the ATV in a poorly ven-
tilated room or covering it with a tarp while it is
still wet, will allow water and humidity to seep
in and cause rust. To prevent corrosion, avoid
damp cellars, stables (because of the presence
of ammonia) and areas where strong chemi-
cals are stored.
[ECB00721]
Long-term
Before storing your ATV for several months: 1. Follow all the instructions in the “ Cleaning”
section of this chapter.
2. Turn the fuel cock lever to “OFF ”.
3. Drain the carburetor float chamber by loosen- ing the drain bolt; this will prevent fuel deposits
from building up. Pour the drained fuel into the
fuel tank.
4. Fill up the fuel tank and add fuel stabilizer (if available) to prevent the fuel from deteriorat-
ing. 5. Perform the following steps to protect the cyl-
inder, piston rings, etc. from corrosion.a. Remove the spark plug cap and spark plug.
b. Pour a teaspoonful of engine oil into the spark plug bore.
c. Install the spark plug cap onto the spark plug, and then place the spark plug on the
cylinder head so that the electrodes are
grounded. (This will limit sparking during
the next step.)
d. Turn the engine over several times with the starter. (This will coat the cylinder wall with
oil.)
e. Remove the spark plug cap from the spark plug, and then install the spark plug and
the spark plug cap.
6. Lubricate all control cables and the pivoting points of all levers and pedals.
7. Check and, if necessary, correct the tire air pressure, and then block up the ATV so that
all of its wheels are off the ground. Alternative-
Specified amount:
7.5 ml of stabilizer to each liter of fuel (or 1
oz of stabilizer to each gallon of fuel)U1BS62E0.book Page 2 Monday, April 18, 2011 6:43 PM

10-1
10
EBU25961
SPECIFICATIONS
Dimensions:Overall length:1780 mm (70.1 in)
Overall width: 1095 mm (43.1 in)
Overall height:
1080 mm (42.5 in)
Seat height: 820 mm (32.3 in)
Wheelbase: 1210 mm (47.6 in)
Ground clearance:
115 mm (4.5 in)
Minimum turning radius: 3100 mm (122 in)Weight:With oil and fuel:
180.0 kg (397 lb)Noise and vibration level:Noise level (77/311/EEC):YFM35RB 84.3 dB(A)@3500 r/min
A-weighted sound power level:
YFM35RB 94.0 dB(A)@3500 r/min
Vibration on seat (EN1032, ISO5008): YFM35RB Will not exceed 0.5 m/s ²
Vibration on handlebar (EN1032, ISO5008): YFM35RB Will not exceed 2.5 m/s ²
Engine:Engine type:
Air cooled 4-stroke, SOHC
Cylinder arrangement: Forward-inclined single cylinder
Displacement:
349 cm ³
Bore × stroke:
83.0 × 64.5 mm (3.27 × 2.54 in)
Compression ratio: 9.20 : 1
Starting system:
Electric starter
Lubrication system: Wet sumpEngine oil:Recommended brand:
YAMALUBE
U1BS62E0.book Page 1 Monday, April 18, 2011 6:43 PM

10-2
10
Type:SAE 5W-30, 10W-30, 10W-40, 15W-40, 20W-40 or 20W-
50
Recommended engine oil grade: API service SG type or higher, JASO standard MA
Engine oil quantity: Without oil filter element replacement:
2.50 L (2.64 US qt, 2.20 Imp.qt)
With oil filter element replacement: 2.60 L (2.75 US qt, 2.29 Imp.qt)Air filter:Air filter element:
Wet elementFuel:Recommended fuel:YFM350RB Unleaded gasoline only
YFM35RB Regular unleaded gasoline only Fuel tank capacity:
9.0 L (2.38 US gal, 1.98 Imp.gal)
Fuel reserve amount: 2.7 L (0.71 US gal, 0.59 Imp.gal)
Carburetor:Type × quantity:
BSR36 x 1Spark plug (s):Manufacturer/model:
NGK/DR8EA
Spark plug gap: 0.6 –0.7 mm (0.024 –0.028 in)Clutch:Clutch type:
Wet, multiple-disc
Operation: Left hand operationTransmission:Primary reduction system:
Spur gear
Primary reduction ratio: 76/24 (3.166)
Secondary reduction system: Chain drive
Secondary reduction ratio:
38/13 (2.923)
Transmission type: Constant mesh 6-speed.forward, 1-speed.reverse
Operation: Left foot operation
0 10 30 50 70 90 110 130 ˚F
–20 –10 0 10 20 30 40 50 ˚CSAE 5W-30
SAE 10W-30
SAE 10W-40
SAE 15W-40
SAE 20W-40SAE 20W-50
U1BS62E0.book Page 2 Monday, April 18, 2011 6:43 PM

INDEX
AAccessories and loading ................................................ 6-8
Air filter element, cleaning ............................................ 8-15BBattery .......................................................................... 8-37
Brake and clutch levers, checking and lubricating ....... 8-33
Brake and shift pedals, checking and lubricating ......... 8-33
Brake fluid, changing ................................................... 8-25
Brake fluid level, checking ........................................... 8-23
Brake lever ..................................................................... 4-5
Brake lever free play, checking the front ...................... 8-25
Brake light switches ..................................................... 8-27
Brake pads, checking the front and rear ...................... 8-22
Brake pedal .................................................................... 4-5
Brake pedal height, checking ....................................... 8-25
Brakes .......................................................................... 8-22
Brakes, front and rear .................................................... 5-3CCables, checking and lubricating ................................. 8-32
Carburetor, adjusting ................................................... 8-20
Chassis fasteners .......................................................... 5-6
Cleaning ......................................................................... 9-1
Clutch lever .................................................................... 4-4
Clutch lever free play, adjusting ................................... 8-28DDrive chain ..................................................................... 5-4
Drive chain, lubricating ................................................. 8-31
Drive chain slack .......................................................... 8-29Drive select lever ........................................................... 4-7
Drive select lever and driving in reverse ........................ 6-3
EEngine break-in .............................................................. 6-6
Engine, cold start ........................................................... 6-1
Engine idling speed ..................................................... 8-20
Engine oil ....................................................................... 5-3
Engine oil and oil filter element .................................... 8-11
Engine, starting a warm ................................................. 6-3
Engine stop switch ......................................................... 4-2FFuel ......................................................................... 4-8, 5-3
Fuel cock ..................................................................... 4-10
Fuel tank cap ................................................................. 4-8
Fuse, replacing ............................................................ 8-40HHandlebar switches ....................................................... 4-2
Headlight beam, adjusting ........................................... 8-42
Headlight bulb, replacing ............................................. 8-40IIdentification numbers .................................................. 11-1
Indicator lights ................................................................ 4-2
Instruments, lights and switches .................................... 5-6LLabel locations ............................................................... 1-1
Light switch .................................................................... 4-3MMain switch .................................................................... 4-1
U1BS62E0.book Page 1 Monday, April 18, 2011 6:43 PM