2000 YAMAHA TTR90 lock

EC085001
ILLUSTRATED SYMBOLS
(Refer to the illustration)
Illustrated symbols
1
to
6
are designed as
thumb tabs to indicate the chapter’s number
and content.
1
General information
2
Specifications
3
Regular inspection and adjustments
4
Engine
5
Chassis
6
Electrical
Illustrated symbols
7
to
D
are used to identify
the specifications appearing in the text.
7
With engine mounted
8
Special tool
9
Filling fluid
0
Lubricant
A
Tightening
B
Specified value, Service limit
C
Engine speed
DResistance (W), Voltage (V), Electric current (A)
Illustrated symbols E to I in the exploded
diagram indicate grade of lubricant and loca-
tion of lubrication point.
EApply gear oil
FApply engine oil
GApply molybdenum disulfide oil
HApply lightweight lithium-soap base grease
IApply molybdenum disulfide grease
Illustrated symbols J to K in the exploded
diagrams indicate where to apply a locking
agent J and when to install a new part K.
JApply locking agent (LOCTITE®)
KReplace 12
34
56
78
90
AB
CD
EFG
HIJ
K
GEN
INFOSPEC
INSP
ADJENG
CHAS–+ELEC
T R..
GME
MLTLS
New

1 - 4
GEN
INFO

IMPORTANT INFORMATION
EC133000
GASKETS, OIL SEALS AND O-RINGS
1. All gaskets, oil seals, and O-rings should
be replaced when an engine is over-
hauled. All gasket surfaces, oil seal lips,
and O-rings must be cleaned.
2. Properly oil all mating parts and bearings
during reassembly. Apply grease to the
oil seal lips.
EC134000
LOCK WASHERS/PLATES AND COTTER
PINS
1. All lock washers/plates
1
and cotter pins
must be replaced when they are
removed. Lock tab(s) should be bent
along the bolt or nut flat(s) after the bolt
or nut has been properly tightened.
EC135001
BEARINGS AND OIL SEALS
1. Install the bearing(s)
1
and oil seal(s)
2
with their manufacturer’s marks or num-
bers facing outward. (In other words, the
stamped letters must be on the side
exposed to view.) When installing oil
seal(s), apply a light coating of light-
weight lithium base grease to the seal
lip(s). Oil the bearings liberally when
installing.
CAUTION:

Do not use compressed air to spin the
bearings dry. This causes damage to the
bearing surfaces.
EC136000
CIRCLIPS
1. All circlips should be inspected carefully
before reassembly. Always replace pis-
ton pin clips after one use. Replace dis-
torted circlips. When installing a circlip
1
, make sure that the sharp-edged cor-
ner
2
is positioned opposite to the thrust
3
it receives. See the sectional view.
4
Shaft

1 - 11
GEN
INFO
CONTROL FUNCTIONS/FUEL
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.
FUEL
Use regular gasoline. Always use fresh, name
brand gasoline.
WARNING
Do not overfill the fuel tank. Avoid spilling
fuel on the hot engine. Do not fill the fuel
tank above the bottom of the filler tube 1
as shown in the illustration or it may over-
flow when the fuel heats up later and
expands.
aFuel level
Recommended fuel:
UNLEADED FUEL RECOM-
MENDED
Fuel tank capacity:
Total:
4.1 L (0.90 lmp gal, 1.08 US gal)
Reserve:
0.5 L (0.11 lmp gal, 0.13 US gal)

SPEC

2 - 6
Stem runout limit ---- 0.02 mm
(0.0008 in)
Valve seat width IN 0.9 ~ 1.1 mm
(0.0354 ~ 0.0433 in)1.6 mm
(0.06 in)
EX 0.9 ~ 1.1 mm
(0.0354 ~ 0.0433 in)1.6 mm
(0.06 in)
Valve spring:
Free length IN 28.32 mm (1.11 in) 26.9 mm
(1.06 in)
EX 28.32 mm (1.11 in) 26.9 mm
(1.06 in)
Set length (valve closed) IN 24.2 mm (0.95 in) ----
EX 24.2 mm (0.95 in) ----
Compressed pressure
(installed) IN 90.4 ~ 104.1 N
(9.2 ~ 10.6 kg, 20.32 ~ 23.40 lb)----
EX 90.4 ~ 104.1 N
(9.2 ~ 10.6 kg, 20.32 ~ 23.40 lb)----
Tilt limit IN ---- 2.5˚/1.2 mm
(2.5˚/0.05 in)
EX ---- 2.5˚/1.2 mm
(2.5˚/0.05 in)
Direction of winding
(top view) IN Clockwise ----
EX Clockwise ---- Item Standard Limit
*

MAINTENANCE SPECIFICATIONS

SPEC

2 - 10
Part to be tightened Thread size Q’tyTightening torque
Nm m•kg ft•lb
Cylinder head nut M8
´
1.25 4 22 2.2 16
Cylinder head bolt M6
´
1.0 2 10 1.0 7.2
Spark plug M10
´
1.0 1 13 1.3 9.4
Cylinder head side cover bolt M6
´
1.0 2 7 0.7 5.1
Tappet cover M45
´
1.5 2 18 1.8 13
Exhaust pipe stud bolt M6
´
1.0 2 7 0.7 5.1
Magneto rotor nut M12
´
1.25 1 48 4.8 35
Timing chain guide (rear) M6
´
1.0 2 10 1.0 7.2
Valve clearance adjust screw locknut M5
´
0.5 2 7 0.7 5.1
Camshaft sprocket M8
´
1.25 1 20 2.0 14
Camshaft bearing retainer M6
´
1.0 1 10 1.0 7.2
Timing chain tensioner cap bolt M8
´
1.25 1 8 0.8 5.8
Timing chain tensioner M6
´
1.0 2 10 1.0 7.2
Oil pump M6
´
1.0 2 7 0.7 5.1
Drain plug M12
´
1.5 1 20 2.0 14
Carburetor joint (cylinder head side) M6
´
1.0 2 7 0.7 5.1
Carburetor joint (carburetor side) M6
´
1.0 2 7 0.7 5.1
Air filter case M6
´
1.0 2 7 0.7 5.1
Exhaust pipe M6
´
1.0 2 7 0.7 5.1
Exhaust pipe M5
´
0.8 2 4 0.4 2.9
Exhaust pipe protector M6
´
1.0 5 7 0.7 5.1
Silencer M8
´
1.25 1 24 2.4 17
Crankcase M6
´
1.0 9 10 1.0 7.2
Crankcase cover (left) M6
´
1.0 8 7 0.7 5.1
Drive sprocket cover M6
´
1.0 2 7 0.7 5.1
Crankcase cover (right) M6
´
1.0 9 7 0.7 5.1
Timing plug M14
´
1.5 1 7 0.7 5.1
Crankshaft end cover M32
´
1.5 1 7 0.7 5.1
Cylinder head stud bolt M8
´
1.25 4 13 1.3 9.4
Kick crank M6
´
1.0 1 10 1.0 7.2
Primary drive gear M12
´
1.0 1 50 5.0 36
Pressure plate M5
´
0.8 4 6 0.6 4.3
Clutch boss M14
´
1.0 1 60 6.0 43
Main axle bearing retainer M6
´
1.0 1 10 1.0 7.2
Shift pedal M6
´
1.0 1 8 0.8 5.8
Clutch adjust screw locknut M6
´
1.0 1 8 0.8 5.8
Pickup coil M6
´
1.0 2 10 1.0 7.2
Stator assembly M6
´
1.0 3 10 1.0 7.2
MAINTENANCE SPECIFICATIONS

2 - 16
SPEC

CABLE ROUTING DIAGRAM
CABLE ROUTING DIAGRAM
1
Crankcase breather hose
2
Wire harness
3
CDI magneto lead
4
Starter cable
5
Engine stop switch lead
6
Air filter case
7
Spark plug lead
8
Throttle cable
9
Fuel tank breather hose
0
Cable holder
A
Brake cable

After fastening the starter cable, CDI magneto lead and ignition coil
lead, cut off any excess from the plastic locking tie end.
õ
Pass the ignition coil lead through the lead guide.
‚
Fasten the engine stop switch lead with the plastic bands.
ë
Pass the brake cable through the cable guides.
12345
6
7
8
9 0
4
A 1
õ
‚
ë
ë
A
A

2 - 18
SPECCABLE ROUTING DIAGRAM
Pass the throttle cable and engine stop switch
lead through the cable guide.
õPass the air vent hose through the hose guide.
‚Fasten the CDI unit lead and rectifier/regulator
lead with the plastic clamp.ëFasten the engine stop switch lead with the plas-
tic locking tie.
äPass the CDI unit lead through the lead guide.
A
123
4
5
6
7
8
9
0A
C
D B
E F G H I
6
6 J L
5
G
B8 K
7 õ
‚
õ
ë
ä
B - B C - C
D - DE - FE
A A B
B B
B
C
C C
CE
B D
B D
F
F F F

3 - 3
INSP
ADJ

ENGINE/THROTTLE CABLE ADJUSTMENT/
AIR FILTER CLEANING
EC350000
ENGINE
EC35A001
THROTTLE CABLE ADJUSTMENT
1. Check:
l
Throttle grip free play
a

Out of specification
®
Adjust.
Throttle grip free play
a
:
3 ~ 5 mm (0.12 ~ 0.20 in)
2. Adjust:
l
Throttle grip free play
EC35G040
AIR FILTER CLEANING
NOTE:

Proper air filter maintenance is the biggest key
to preventing premature engine wear and
damage.
CAUTION:

Never run the engine without the air filter
element in place; this would allow dirt and
dust to enter the engine and cause rapid
wear and possible engine damage.Throttle grip free play adjustment steps:
Turning in: Free play is increased.
Turning out: Free play is decreased.
l
Tighten the locknuts.
NOTE:
Before adjusting the throttle cable free play,
the engine idle speed should be adjusted.
lLoosen the locknut 1 on throttle cable.
lTurn the adjuster 2 in or out until the
specified free play is obtained.
WARNING
After adjusting, turn the handlebar to
right and left and make sure that the
engine idling does not run faster.