2006 YAMAHA TTR50 fuel

IMPORTANT NOTICE
This machine is designed for off-road use only
by young operators under adult instruction and
supervision. It is illegal for this machine to be
operated on any public street, road, or high-
way.
Off-road use on public lands may be illegal.
Please check local regulations before riding.1. GASOLINE IS HIGHLY FLAMMABLE: * Always turn off the engine when
refueling.
* Take care not to spill on the engine or exhaust pipe/muffler, when refu-
eling.
* Never refuel while smoking or in the vicinity of an open flame.
2. If you should swallow some gasoline or inhale a lot of gasoline vapor, or
allow some gasoline to get in your
eye(s), see your doctor immediately.
If any gasoline spills on your skin or
clothing, immediately wash it with
soap and water, and change your
clothes.
3. Always turn off the engine before leaving the machine unattended.
When parking the machine, note the
following:
* The engine and exhaust pipe(s)/muffler(s) may be hot. Park the
machine in a place where pedestri-
ans or children are not likely to
touch the machine.
* Do not park the machine on a slope or soft ground; the machine may
overturn.
SAFETY INFORMATION

4. When transporting the machine inanother vehicle, be sure is kept
upright and that the fuel cock is
turned to the “OFF ”. If it should lean
over, gasoline may leak out of the car-
buretor or fuel tank.
5. Never start your engine or let it run for any length of time in a closed
area. The exhaust fumes are poison-
ous and may cause loss of con-
sciousness and death within a short
time. Always operate your machine in
an area with adequate ventilation.
6. Always wear a helmet, gloves, boots, trousers, and jacket for motocross
riding.

CONTENTS
CHAPTER 1
GENERAL INFORMATION
DESCRIPTION ............................................1-1
MACHINE IDENTIFICATION ......................1-2
IMPORTANT INFORMATION .....................1-3
CHECKING OF CONNECTION ..................1-5
SPECIAL TOOLS .......................................1-6
CONTROL FUNCTIONS .............................1-8
FUEL .........................................................1-11
STARTING AND OPERATION .................1-12
CLEANING AND STORAGE ....................1-13
CHAPTER 2
SPECIFICATIONS
GENERAL SPECIFICATIONS ....................2-1
MAINTENANCE SPECIFICATIONS ...........2-4
GENERAL TORQUE
SPECIFICATIONS ....................................2-16
DEFINITION OF UNITS ............................2-16
CABLE ROUTING DIAGRAM ..................2-17
CHAPTER 3
REGULAR INSPECTION AND ADJUSTMENTS
MAINTENANCE INTERVALS ....................3-1
PRE-OPERATION INSPECTION AND
MAINTENANCE ..........................................3-3
ENGINE .......................................................3-4
CHASSIS ..................................................3-14
ELECTRICAL ............................................3-23

CHAPTER 4ENGINE
FRONT FENDER, SEAT ASSEMBLY
AND FUEL TANK .......................................4-1
MUFFLER ...................................................4-3
CARBURETOR ...........................................4-4
CYLINDER HEAD .....................................4-10
CAMSHAFT AND ROCKER ARMS .........4-15
VALVES AND VALVE SPRINGS .............4-18
CYLINDER AND PISTON .........................4-23
CLUTCH ....................................................4-29
SHIFT SHAFT ...........................................4-37
OIL PUMP .................................................4-39
AC MAGNETO AND
STARTER CLUTCH ..................................4-42
ENGINE REMOVAL ..................................4-47
CRANKCASE AND CRANKSHAFT .........4-51
SHIFT FORK, SHIFT CAM AND
TRANSMISSION .......................................4-54
CHAPTER 5
CHASSIS
FRONT WHEEL AND REAR WHEEL ........5-1
HANDLEBAR ............................................5-10
STEERING AND
FRONT SUSPENSION .............................5-13
SWINGARM ..............................................5-17
CHAPTER 6
ELECTRICAL
ELECTRICAL COMPONENTS AND
WIRING DIAGRAM .....................................6-1
IGNITION SYSTEM .....................................6-2
ELECTRIC STARTING SYSTEM ...............6-6
CHARGING SYSTEM ...............................6-14
CARBURETOR HEATING SYSTEM ........6-16
MAINTENANCE RECORD .......................6-20

1 - 1
GEN
INFO
DESCRIPTION
EC100000
GENERAL INFORMATION
EC110000
DESCRIPTION
1 Engine stop switch
2 Starter lever (choke)
3 Main switch
4 Front brake lever
5 Throttle grip
6 Start switch
7 Fuel tank cap
8 Fuel tank
9 Rear brake pedal
0 Fuel cock
A Air cleaner
B Drive chain
C Shift pedal
D Front fork
E Reflector (For Canada)
NOTE:

The machine you have purchased may differ
slightly from those shown in the following.
 Designs and specifications are subject to
change without notice.
1
4
7
5
2 6
3
\b
8
EE
0\f
DC B
1

GEN
INFO
1 - 6
SPECIAL TOOLS
SPECIAL TOOLS
The proper special tools are necessary for complete and accurate tune-up and assembly. Using the
correct special tool will help prevent damage caused by the use of improper tools or improvised
techniques. The shape and part number used for the special tool differ by country, so two types are
provided. Refer to the list provided to avoid errors when placing an order.
NOTE:
 For U.S.A. and Canada, use part number starting with “YM- ”, “YU- ”, “YS- ” or “ACC- ”.
 For others, use part number starting with “90890- ”.
Part number Tool name/How to use Illustration
YU-01083-3, 90890-01084
YU-01083-1, 90890-01083 Weight
Slide hammer bolt
These tools are used when removing or installing the
rocker arm shafts. YU-01083-3
YU-01083-1
90890-01084
90890-01083
YU-03112-C, 90890-03112 Pocket tester Use this tool to inspect the coil resistance, output
voltage and amperage. YU-03112-C 90890-03112
YM-04019, 90890-04019 Valve spring compressor This tool is needed to remove and install the valve
assemblies. YM-04019 90890-04019
YM-04108, 90890-04108 Valve spring compressor attachment This tool is needed to remove and install the valve
assemblies. YM-04108 90890-04108
YU-01304, 90890-01304 Piston pin puller set This tool is used to remove the piston pin. YU-01304 90890-01304
YM-01312-A, 90890-01312 Fuel level gauge This gauge is used to measure the fuel level in the
float chamber. YM-01312-A 90890-01312
YM-08035-A, 90890-01311 Tappet adjusting tool This tool is necessary for adjusting valve clearance. YM-08035-A 90890-01311

1 - 9
GEN
INFO
CONTROL FUNCTIONS
EC155001
THROTTLE GRIP
The throttle grip 1 is located on the right han-
dlebar; it accelerates or decelerates the
engine. For acceleration, turn the grip toward
you; for deceleration, turn it away from you.
1
EC156000
FRONT BRAKE LEVER
The front brake lever 1 is located on the right
handlebar. Pull it toward the handlebar to acti-
vate the front brake.
1
EC157000
REAR BRAKE PEDAL
The rear brake pedal 1 is located on the right
side of the machine. Press down on the brake
pedal to activate the rear brake.
1
FUEL COCK
The fuel cock supplies fuel from the tank to
carburetor while filtering the fuel. The fuel cock
has the three positions:
OFF: With the lever in this position, fuel will not flow. Always return the lever to this posi-
tion when the engine is not running.
ON: With the lever in this position, fuel flows to the carburetor. Normal riding is done
with the lever in this position.
RES: This indicates reserve. If you run out of fuel while riding, move the lever to this
position. FILL THE TANK AT THE FIRST
OPPORTUNITY. BE SURE TO SET
THE LEVER TO “ON ” AFTER REFUEL-
ING.

1 - 10
GEN
INFO
CONTROL FUNCTIONS
STARTER LEVER (CHOKE)
When cold, the engine requires a richer air/fuel
mixture for starting. A separate starter circuit,
which is controlled by the starter lever 1, sup-
plies this mixture.
Pull the lever out to open the circuit (for start-
ing) and push the lever in to close the circuit.
1
FUEL TANK CAP
Remove the fuel tank cap 1 by turning
counter-clockwise.
WARNING
Do not overfill the fuel tank. Avoid spilling
fuel on the hot engine.
1
SIDESTAND
This sidestand 1 is used to support only the
machine when standing or transporting it.
WARNING
 Never apply additional force to the side-
stand.
Hold up the sidestand before starting out.1