2000 YAMAHA TTR90 engine

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 refu-
eling.
* Take care not to spill on the engine or
exhaust pipe/muffler, when refueling.
* 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, immedi-
ately 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)/muf-
fler(s) may be hot. Park the machine
in a place where pedestrians or chil-
dren are not likely to touch the
machine.
* Do not park the machine on a slope or
soft ground; the machine may over-
turn.
SAFETY INFORMATION

4. When transporting the machine in
another 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 carburetor 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 poisonous and may
cause loss of consciousness and death
within a short time. Always operate your
machine in an area with adequate venti-
lation.
6. Always wear a helmet, gloves, boots,
trousers, and jacket for motocross riding.

SAFETY INFORMATION

1. Don’t ride it on the street.
2. Don’t run the engine inside a building.
3. This is a one-seater motorbike. Don’t give
any person a ride.
4. Let’s learn how to ride properly. Ask your
parents for any question.
5. When riding the machine, be sure to wear
the protective apparel as illustrated.
1
Helmet
2
Goggles
3
Mouth guard
4
Gloves
5
Boots
6
Motocross pants
7
Long sleeved trainer

6. When going for riding, be sure to be with
your family.
Never go alone.
7. Before riding the machine, ask your par-
ents to check the machine very carefully.
8. Don’t touch the areas shown, or you’ll get
burnt in the hand.
9. Don’t touch rotating or moving parts.
10. Before starting the engine, be sure to shift
the transmission into neutral.

EC080000
HOW TO USE
THIS MANUAL
EC081000
PARTICULARLY IMPORTANT
INFORMATION
The Safety Alert Symbol means ATTENTION!
BECOME ALERT! YOUR SAFETY IS
INVOLVED!
Failure to follow WARNING instructions could
result in severe injury or death to the machine
operator, a bystander, or a person inspecting
or repairing the machine.
A CAUTION indicates special precautions that
must be taken to avoid damage to the
machine.
NOTE:
A NOTE provides key information to make pro-
cedures easier or clearer.
EC082000
FINDING THE REQUIRED PAGE
1. This manual consists of six chapters;
“General Information”, “Specifications”,
“Regular inspection and adjustments”,
“Engine”, “Chassis” and “Electrical”.
2. The table of contents is at the beginning
of the manual. Look over the general lay-
out of the book before finding then
required chapter and item.
Bend the book at its edge, as shown, to
find the required fore edge symbol mark
and go to a page for required item and
description.
WARNING
CAUTION:

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

EB004000
INDEX
GENERAL
INFORMATION
SPECIFICATIONS
REGULAR
INSPECTION AND
ADJUSTMENT
ENGINE
CHASSIS
ELECTRICAL

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
........................... 1-9
FUEL
....................................................... 1-11
STARTING AND OPERATION
............... 1-12
CHAPTER 2
SPECIFICATIONS
GENERAL SPECIFICATIONS
................... 2-1
MAINTENANCE SPECIFICATIONS
......... 2-4
GENERAL TORQUE
SPECIFICATIONS
.................................. 2-15
DEFINITION OF UNITS
.......................... 2-15
CABLE ROUTING DIAGRAM
................ 2-16
CHAPTER 3
REGULAR INSPECTION AND
ADJUSTMENTS
MAINTENANCE INTERVALS
................... 3-1
PERIODIC MAINTENANCE AND
LUBRICATION
.......................................... 3-1
PRE-OPERATION INSPECTION AND
MAINTENANCE
........................................ 3-2
ENGINE
..................................................... 3-3
CHASSIS
................................................. 3-11
ELECTRICAL
.......................................... 3-19