2000 YAMAHA TTR90 Fuel tank

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.

1 - 1
GEN
INFO

DESCRIPTION
EC100000
GENERAL INFORMATION
EC110000
DESCRIPTION
1
“ENGINE STOP” button
2
Front brake lever
3
Throttle grip
4
Fuel tank cap
5
Kick starter
6
Fuel tank
7
Air cleaner
8
Rear brake pedal
9
Fuel cock
0
Starter lever (choke)
A
Drive chain
B
Shift pedal
C
Front fork
NOTE:

l
The machine you have purchased may differ
slightly from those shown in the following.
l
Designs and specifications are subject to
change without notice.
1
1

1 - 10
GEN
INFO
CONTROL FUNCTIONS
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.
EC158001
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
position 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
REFUELING.
EC159000
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 - 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)

GEN
INFO
1 - 12
STARTING AND OPERATION
STARTING AND OPERATION
CAUTION:
Prior to operating the machine, perform
steps listed in pre-operation check list.
WARNING
Never start your engine or let it run for any
length of time in a closed area. The exhaust
fumes are poisonous and can cause loss of
consciousness and death within a short
time. Always operate your machine in an
area with adequate ventilation.
STARTING A COLD ENGINE
WARNING
Before starting the engine, be sure to shift
the transmission into neutral.
1. Turn the fuel cock to “ON”.
2. Operate the starter (choke) and com-
pletely close the throttle grip.
3. Slide the “ENGINE STOP” switch to the
“”.
4. Kick the kick starter with full strength to
start the engine.
5. After the engine starts, warm up for one
or two minutes. Make sure the stater
(choke) is returned to the original position
before riding.
STARTING A WARM ENGINE
To start a warm engine, refer to the “Starting a
cold engine” section. The starter (choke)
should not be used. The throttle should be
opened slightly.
CAUTION:
See “Break-in Section” prior to operating
engine for the first time.WARMING UP
To get maximum engine life, always “warm-up”
the engine before starting off. Never acceler-
ate hard with a cold engine! To see whether or
not the engine is warm, see if it responds to
throttle normally with the stater (choke) turned
off.
WARNING
Before starting off, be sure to turn up or
remove the side stand.
Failure to retract the side stand completely
can result in a serious accident when you
try to turn a corner.
ENGINE BREAK-IN
1. Prior to starting, fill fuel tank with gasoline
and oil tank with specified oil.
2. Allow engine to warm up. Check engine
idling speed. Check operating controls
and engine stop switch operation.
3. Operate machine in lower gears at mod-
erate throttle setting for 3 ~ 5 minutes.
Check spark plug condition.
4. Allow engine to cool. Repeat procedure,
running for 5 minutes. Very briefly, shift to
higher gears and check full throttle
response. Check spark plug condition.
5. Allow engine to cool. Repeat procedure,
running for 5 minutes. Full throttle and
higher gears may be used, but avoid sus-
tained full throttle operation. Check spark
plug condition.
6. Allow engine to cool. Remove top end and
inspect. Remove “high” spots on piston
with No.600 grit, wet sandpaper.
Clean, and carefully reassemble.
7. Check entire unit for loose or misadjusted
fittings/controls/fasteners.
8. Re-start engine and check through entire
operating range thoroughly. Stop. Check
spark plug condition. Re-start. After 10 ~
15 minutes operation, machine is ready
to ride.
CAUTION:
After the break-in period, check every fit-
ting and fastener for looseness.
If any loose is found, retighten it securely.

SPEC

2 - 1
EC200000
SPECIFICATIONS
EC211000
GENERAL SPECIFICATIONS
Model name: TTR90M
Model code number: 5HN1 (USA-except for California)
5HN2 (USA-for California)
5HN3 (Europe, Oceania)
5HN4 (CDN)
Dimensions:
Overall length 1,525 mm (57.0 in)
Overall width 605 mm (23.8 in)
Overall height 865 mm (34.1 in)
Seat height 625 mm (24.6 in)
Wheelbase 1,040 mm (40.9 in)
Minimum ground clearance 160 mm (6.3 in)
Minimum turning radius 1,328 mm (52.3 in)
Basic weight:
With oil and full fuel tank 64 kg (141 lb)
Engine:
Engine type Air cooled 4-stroke, SOHC
Cylinder arrangement Single cylinder, forward inclined
Displacement 89 cm
3

(5.43 cu.in)
Bore

´

stroke 47.0
´
51.8 mm (1.85
´
2.04 in)
Compression ratio 8.5 : 1
Compression pressure (STD) 1,000 kPa (10 kg/cm
2

, 145 psi) at 1,000 r/min
Starting system Kick starter
Lubrication system: Wet sump
Oil type or grade:
Engine oil

Yamalube 4 (20W40) or SAE 20W40 type
SE/SF motor oil (5 ˚C (60 ˚F) or higher)
Yamalube 4 (10W30) or SAE 10W30 type
SE/SF motor oil (–10 ˚C (10 ˚F) or higher)
Oil capacity:
Engine oil
Periodic oil change 0.8 L (0.70 Imp qt, 0.85 US qt)
Total amount 1.0 L (0.88 Imp qt, 1.06 US qt)
Air filter: Wet type element
0 10 30 50 70 90 110 130
-20 -10 01020
30 40 50

õ
˚F
˚C

GENERAL SPECIFICATIONS
2

SPEC

2 - 2
Fuel:
Type Unleaded fuel (USA)
Premium unleaded gasoline (CDN, Europe)
Unleaded fuel only (AUS)
Premium gasoline (Oceania)
Tank capacity 4.1 L (0.90 lmp gal, 1.08 US gal)
Reserve amount 0.5 L (0.11 Imp gal, 0.13 US gal)
Carburetor:
Type VM16SH
Manufacturer MIKUNI
Spark plug:
Type CR6HSA/U20FSR-U
Manufacturer NGK/DENSO
Gap 0.6 ~ 0.7 mm (0.02 ~ 0.03 in)
Clutch type: Wet, multiple-disc and centrifugal automatic
Transmission:
Primary reduction system Spur gear
Primary reduction ratio 67/18 (3.722)
Secondary reduction system Chain drive
Secondary reduction ratio 35/14 (2.500)
Transmission type Constant mesh, 3-speed
Operation Left foot operation
Gear ratio: 1st 37/13 (2.846)
2nd 33/19 (1.736)
3rd 28/23 (1.217)
Chassis:
Frame type Double cradle
Caster angle 24.83˚
Trail 56.0 mm (2.2 in)
Tire:
Type With tube
Size (front) 2.50-14 4PR
Size (rear) 3.00-12 4PR
Manufacturer (front and rear) CHENG SHIN
Type (front and rear) KNOBBY
Tire pressure (front and rear) 100 kPa (1.00 kg/cm
2

, 14.5 psi)
Brake:
Front brake type Drum brake
Operation Right hand operation
Rear brake type Drum brake
Operation Right foot operation
Suspension:
Front suspension Telescopic fork
Rear suspension Swingarm (monocross suspension)
GENERAL SPECIFICATIONS
2

SPEC

2 - 13
HINWEIS:NOTE:
1. First, tighten the ring nut approximately 38 Nm (3.8 m • kg, 27 ft • lb) by using the ring nut
wrench, then loosen the ring nut completely.
2. Retighten the ring nut 1 Nm (0.1 m • kg, 0.7 ft • lb).Part to be tightened Thread size Q’tyTightening torque
Nm m•kg ft•lb
Engine mounting:
Engine and frame (front-upper) M8 ´ 1.25 1 30 3.0 22
Engine and frame (rear-upper) M8 ´ 1.25 1 26 2.6 19
Engine and frame (rear-lower) M10 ´ 1.25 1 40 4.0 29
Pivot shaft and nut M10 ´ 1.25 1 30 3.0 22
Handle crown and steering shaft M10 ´ 1.25 1 40 4.0 29
Front fork cap bolt M20 ´ 1.0 2 40 4.0 29
Handle crown and handlebar holder (lower) M10 ´ 1.25 2 40 4.0 29
Handlebar holder (upper) M6 ´ 1.0 4 13 1.3 9.4
Front brake cable holder and front fork M6 ´ 1.0 2 7 0.7 5.1
Steering ring nut M25 1 Refer to NOTE.
Fuel tank and fuel cock M6 ´ 1.0 2 7 0.7 5.1
Fuel tank and frame M6 ´ 1.0 2 7 0.7 5.1
Grab bar and frame M6 ´ 1.0 4 13 1.3 9.4
Front brake camshaft lever and camshaft M6 ´ 1.0 1 7 0.7 5.1
Rear brake camshaft lever and camshaft M6 ´ 1.0 1 7 0.7 5.1
Front wheel axle nut M10 ´ 1.25 1 35 3.5 25
Rear brake shoe plate tension bar M8 ´ 1.25 2 26 2.6 19
Wheel drive hub and driven sprocket M8 ´ 1.25 4 25 2.5 18
Rear wheel axle nut M12 ´ 1.25 1 60 6.0 43
Footrest and frame M8 ´ 1.25 2 30 3.0 22
MAINTENANCE SPECIFICATIONS