2006 YAMAHA TTR50 oil

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INSPADJ
LUBRICATION
LUBRICATION
To ensure smooth operation of all compo-
nents, lubricate your machine during setup,
after break-in, and after every race.
1 All control cable
2 Brake lever pivot
3 Shift pedal pivot
4 Footrest pivot
5 Throttle-to-handlebar contact
6 Drive chain
7 Tube guide cable winding portion
8 Throttle cable end
9 Brake cable end È
Use Yamaha cable lube or equivalent on these
areas.
É Use SAE 10W-30 motor oil or suitable chain
lubricants.
Ê Lubricate the following areas with high quality,
lightweight lithium-soap base grease.
AAA
AAB
CC
7 8

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INSPADJ
BATTERY INSPECTION AND CHARGING
WARNING
Batteries generate explosive hydrogen gas
and contain electrolyte which is made of
poisonous and highly caustic sulfuric acid.
Therefore, always follow these preventive
measures:
 Wear protective eye gear when handling
or working near batteries.
 Charge batteries in a well-ventilated area.
 Keep batteries away from fire, sparks or
open flames (e.g., welding equipment,
lighted cigarettes).
 DO NOT SMOKE when charging or han-
dling batteries.
 KEEP BATTERIES AND ELECTROLYTE
OUT OF REACH OF CHILDREN.
 Avoid bodily contact with electrolyte as it
can cause severe burns or permanent eye
injury.
FIRST AID IN CASE OF BODILY CONTACT:
EXTERNAL
 Skin — Wash with water.
 Eyes — Flush with water for 15 minutes
and get immediate medical attention.
INTERNAL
 Drink large quantities of water or milk fol-
lowed with milk of magnesia, beaten egg
or vegetable oil. Get immediate medical
attention.
CAUTION:
Charging time, charging amperage and
charging voltage for an MF battery are dif-
ferent from those of conventional batteries.
The MF battery should be charged as
explained in the charging method illustra-
tions. If the battery is overcharged, the
electrolyte level will drop considerably.
Therefore, take special care when charging
the battery.
BATTERY INSPECTION AND CHARGING

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ENGCYLINDER HEAD
4. Remove:Cylinder head
NOTE:
 Loosen the bolts and nuts in their proper
loosening sequence.
 Start by loosening each bolt and nut 1/2 turn
until all are loose.1
2
5
64
3
ASSEMBLY AND INSTALLATION
1. Install:
Cylinder head
2. Tighten: Nuts
 Bolts
NOTE:
 Apply the engine oil on the contact surfaces
of the nuts and copper washers.
 Apply the engine oil on the thread and con-
tact surface of the bolts.
 Follow the numerical order shown in the illus-
tration. Tighten the bolts and nuts in two
stages.
6
5
2
13
4
T R..22 Nm (2.2 m · kg, 16 ft · lb)
T R..10 Nm (1.0 m · kg, 7.2 ft · lb)
3. Install:
Camshaft sprocket 1
Installation steps:
 Turn the crankshaft counterclockwise until
the “I” mark a on the rotor is aligned with
the stationary pointer b on the crankcase
cover.
 Align the “I” mark c on the camshaft
sprocket with the stationary pointer d on
the cylinder head.
 Fit the timing chain 2 onto camshaft
sprocket and install the camshaft sprocket
on the camshaft.
NOTE:
When installing the camshaft sprocket, keep
the timing chain as tense as possible on the
exhaust side.
b
a
1
2
c
d

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ENGCAMSHAFT AND ROCKER ARMS
REMOVAL POINTS
Rocker arm shaft
1. Remove:Rocker arm shafts
NOTE:
Use a slide hammer bolt 1 and weight 2 to
slide out the rocker arm shafts.
Slide hammer bolt:
YU-01083-1/90890-01083
Weight: YU-01083-3/90890-01084
INSPECTION
Camshaft
1. Measure:
Cam lobes length a and b
Out of specification → Replace.
Cam lobes length limit:
Intake:
a 25.328 mm (0.9972 in)
b 20.934 mm (0.8242 in)
Exhaust:
a 25.186 mm (0.9916 in)
b 20.947 mm (0.8247 in)
ASSEMBLY AND INSTALLATION
1. Apply:
Molybdenum disulfide oil
(onto the camshaft cam lobe)
 Engine oil
(onto the camshaft bearing)
2. Install: Camshaft 1

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ENGCAMSHAFT AND ROCKER ARMS
3. Apply:Molybdenum disulfide oil
(onto the rocker arm and rocker arm
shaft)
4. Install: Rocker arm 1
 Rocker arm shaft 2

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ENGVALVES AND VALVE SPRINGS
2. Lap:Valve face
 Valve seat
NOTE:
After refacing the valve seat or replacing the
valve and valve guide, the valve seat and
valve face should be lapped.
Lapping steps:
 Apply a coarse lapping compound to the
valve face.
CAUTION:
Do not let the compound enter the gap
between the valve stem and the guide.
 Apply molybdenum disulfide oil to the
valve stem.
 Install the valve into the cylinder head.
 Turn the valve until the valve face and
valve seat are evenly polished, then clean
off all of the compound.
NOTE:
For best lapping results, lightly tap the valve
seat while rotating the valve back and forth
between your hands.
Apply a fine lapping compound to the
valve face and repeat the above steps.
NOTE:
After every lapping operation be sure to
clean off all of the compound from the valve
face and valve seat.
Apply Mechanic ’s blueing dye (Dykem) to
the valve face.
 Install the valve into the cylinder head.
 Press the valve through the valve guide
and onto the valve seat to make a clear
pattern.
 Measure the valve seat width again. If the
valve seat width is out of specification,
reface and relap the valve seat.

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ENGVALVES AND VALVE SPRINGS
ASSEMBLY AND INSTALLATION
1. Apply:Molybdenum disulfide oil
(onto the valve stem and valve stem seal)
2. Install: Valve stem seats
 Valves
 Valve springs
 Valve spring retainers
NOTE:
Install the valve springs with the larger pitch a
facing upwards.
bSmaller pitch
New
3. Install:
Valve cotters
NOTE:
While compressing the valve spring with a
valve spring compressor and attachment 1
install the valve cotters.
Valve spring compressor:
YM-04019/90890-04019
Valve spring compressor attach-
ment: YM-04108/90890-04108
4. To secure the valve cotters onto the valve
stem, lightly tap the valve tip with a piece of
wood.
CAUTION:
Hitting the valve tip with excessive force
could damage the valve.

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ENGCYLINDER AND PISTON
CYLINDER AND PISTON
Extent of removal: 1 Cylinder removal
2 Piston removal
Extent of removal Order Part name Q ’ty Remarks
CYLINDER AND PISTON
REMOVAL
Preparation for removal Cylinder head Refer to “CYLINDER HEAD ” section.
1 Timing chain guide (exhaust) 1
2 Cylinder 1
3 Dowel pin 2
4 Gasket 1
5 Piston pin clip 2 Use special tool.
Refer to “REMOVAL POINTS ”.
6 Piston pin 1
7Piston 1
8 Piston ring (top) 1
Refer to “REMOVAL POINTS ”.
9 Piston ring (2nd) 1
10 Oil ring 1
2
1