2007 YAMAHA TTR90 engine

INSTRUMENT AND CONTROL FUNCTIONS
3-3
3
EAU13180
Fuel tank cap To remove the fuel tank cap, turn it
counterclockwise, and then pull it off.
To install the fuel tank cap, insert it into
the tank opening, and then turn it clock-
wise.
WARNING
EWA11090
Make sure that the fuel tank cap isproperly closed before riding.
EAU13211
Fuel Make sure that there is sufficient fuel in
the tank. Fill the fuel tank to the bottom
of the filler tube as shown.
WARNING
EWA10880


Do not overfill the fuel tank, oth-
erwise it may overflow when the
fuel warms up and expands.


Avoid spilling fuel on the hot en-gine.
CAUTION:
ECA10070
Immediately wipe off spilled fuel
with a clean, dry, soft cloth, since
fuel may deteriorate painted surfac-es or plastic parts.
EAU41930
For CanadaCAUTION:
ECA11400
Use only unleaded gasoline. The use
of leaded gasoline will cause severe
damage to internal engine parts,
such as the valves and piston rings,as well as to the exhaust system.
Your Yamaha engine has been de-
signed to use regular unleaded gaso-
line with a pump octane number
1. Fuel tank cap
1. Fuel tank filler tube
2. Fuel level
Recommended fuel:
REGULAR UNLEADED GASOLINE
ONLY
Fuel tank capacity:
4.2 L (1.11 US gal) (0.92 Imp.gal)
Fuel reserve amount:
0.5 L (0.13 US gal) (0.11 Imp.gal)
U3P281E0.book Page 3 Monday, April 17, 2006 11:26 AM

INSTRUMENT AND CONTROL FUNCTIONS
3-4
3 [(R+M)/2] of 86 or higher, or a research
octane number of 91 or higher. If
knocking (or pinging) occurs, use a
gasoline of a different brand or premi-
um unleaded fuel. Use of unleaded fuel
will extend spark plug life and reduce
maintenance cost.
Gasohol
There are two types of gasohol: gaso-
hol containing ethanol and that contain-
ing methanol. Gasohol containing
ethanol can be used if ethanol content
does not exceed 10%. Gasohol con-
taining methanol is not recommended
by Yamaha because it can cause dam-
age to the fuel system or vehicle perfor-
mance problems.
For Europe, Oceania and South Afri-
ca
CAUTION:
ECA11400
Use only unleaded gasoline. The use
of leaded gasoline will cause severe
damage to internal engine parts,
such as the valves and piston rings,as well as to the exhaust system.
Your Yamaha engine has been de-
signed to use regular unleaded gaso-
line with a research octane number of
91 or higher. If knocking (or pinging) oc-
curs, use a gasoline of a different brand
or premium unleaded fuel. Use of un-
leaded fuel will extend spark plug life
and reduce maintenance costs.
EAU13411
Fuel tank breather hose TT-R90(W)
TT-R90E(W)
Before operating the motorcycle:

Check the fuel tank breather hose
connection.
Recommended fuel:
For Europe: REGULAR UNLEADED
GASOLINE ONLY
For Oceania and South Africa: UN-
LEADED GASOLINE ONLY
Fuel tank capacity:
4.2 L (1.11 US gal) (0.92 Imp.gal)
Fuel reserve amount:
0.5 L (0.13 US gal) (0.11 Imp.gal)
1. Fuel tank breather hose
1. Fuel tank breather hose
U3P281E0.book Page 4 Monday, April 17, 2006 11:26 AM

INSTRUMENT AND CONTROL FUNCTIONS
3-5
3


Check the fuel tank breather hose
for cracks or damage, and replace
it if damaged.


Make sure that the end of the fuel
tank breather hose is not blocked,
and clean it if necessary.
EAU13561
Fuel cock The fuel cock supplies fuel from the
tank to the carburetor while filtering it al-
so.
The fuel cock has 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.
RES1. Arrow mark positioned over “OFF”
1. Arrow mark positioned over “ON”
1. Arrow mark positioned over “RES”
U3P281E0.book Page 5 Monday, April 17, 2006 11:26 AM

INSTRUMENT AND CONTROL FUNCTIONS
3-6
3 This indicates reserve. If you run out of
fuel while riding, move the lever to this
position. Fill the tank at the first oppor-
tunity. Be sure to set the lever back to
“ON” after refueling!
EAU13590
Starter (choke) lever “” Starting a cold engine requires a richer
air-fuel mixture, which is supplied by
the starter (choke).
Move the lever in direction (a) to turn on
the starter (choke).
Move the lever in direction (b) to turn off
the starter (choke).
EAU13680
Kickstarter To start the engine, fold out the kick-
starter lever, move it down lightly with
your foot until the gears engage, and
then push it down smoothly but force-
fully.
1. Starter (choke) lever “”
1. Kickstarter lever
U3P281E0.book Page 6 Monday, April 17, 2006 11:26 AM

INSTRUMENT AND CONTROL FUNCTIONS
3-9
3
With the engine turned off:
1. Make sure that the engine stop switch is set to “
”.
2. Turn the key to “ON”.
3. Shift the transmission into gear.
4. Keep the front or rear brake applied.
5. Push the start switch.
Does the engine start?
The neutral switch may be defective.
The motorcycle should not be ridden until
checked by a Yamaha dealer.
6. Shift the transmission into the neutral position.
7. Push the start switch.
Does the engine start?
The neutral switch may be defective.
The motorcycle should not be ridden until
checked by a Yamaha dealer.
YES
NOTE:
a warmed-up engine.
NO
The system is OK. The motorcycle can be ridden.
YES
NO
This check is most reliable if performed with
U3P281E0.book Page 9 Monday, April 17, 2006 11:26 AM

PRE-OPERATION CHECKS
4-2
4
EAU15605
Pre-operation check list
ITEM CHECKS PAGE
FuelCheck fuel level in fuel tank.
Refuel if necessary.
Check fuel line for leakage.3-3
Engine oilCheck oil level in engine.
If necessary, add recommended oil to specified level.
Check vehicle for oil leakage.6-8
Front brakeCheck operation.
Lubricate cable if necessary.
Check lever free play.
Adjust if necessary.6-17, 6-18
Rear brakeCheck operation.
Check pedal free play.
Adjust if necessary.6-17, 6-18
Throttle gripMake sure that operation is smooth.
Check cable free play.
If necessary, have Yamaha dealer adjust cable free play and lubricate cable and
grip housing.6-14, 6-21
Control cablesMake sure that operation is smooth.
Lubricate if necessary.6-21
Drive chainCheck chain slack.
Adjust if necessary.
Check chain condition.
Lubricate if necessary.6-18, 6-20
Wheels and tiresCheck for damage.
Check tire condition and tread depth.
Check air pressure.
Correct if necessary.6-15, 6-16
Shift pedalMake sure that operation is smooth.
Correct if necessary.6-21
U3P281E0.book Page 2 Monday, April 17, 2006 11:26 AM

PRE-OPERATION CHECKS
4-3
4
Brake pedalMake sure that operation is smooth.
Lubricate pedal pivoting point if necessary.6-21
Brake leverMake sure that operation is smooth.
Lubricate lever pivoting point if necessary.6-22
SidestandMake sure that operation is smooth.
Lubricate pivot if necessary.6-22
Chassis fastenersMake sure that all nuts, bolts and screws are properly tightened.
Tighten if necessary.—
Engine stop switchCheck operation.3-1 ITEM CHECKS PAGE
U3P281E0.book Page 3 Monday, April 17, 2006 11:26 AM

OPERATION AND IMPORTANT RIDING POINTS
5-1
5
EAU41680
WARNING
EWA14620


This model is designed for off-
road use only. Become thor-
oughly familiar with all operat-
ing controls and their functions
before riding. Consult a Yamaha
dealer regarding any control or
function that you do not thor-
oughly understand.


Never start the engine or oper-
ate it in a closed area for any
length of time. Exhaust fumes
are poisonous, and inhaling
them can cause loss of con-
sciousness and death within a
short time. Always make sure
that there is adequate ventila-
tion.


Before starting out, make sure
that the sidestand is up. If the
sidestand is not raised com-
pletely, it could contact the
ground and distract the opera-
tor, resulting in a possible lossof control.
EAU41670
Starting and warming up a
cold engine [TT-R90(W)]1. Turn the fuel cock lever to “ON”.
2. Set the engine stop switch to “”.
3. Shift the transmission into the neu-
tral position.
WARNING
EWA14410


Be sure to shift the transmis-
sion into neutral before starting
the engine.


Never ride with the sidestanddown.
4. Turn the starter (choke) on and
completely close the throttle. (See
page 3-6.)
5. Start the engine by pushing the
kickstarter lever down.
CAUTION:
ECA11130
For maximum engine life, always
warm the engine up before starting
off. Never accelerate hard when theengine is cold!
6. When the engine is warm, turn the
starter (choke) off.
NOTE:The engine is warm when it responds
normally to the throttle with the starter(choke) turned off.
U3P281E0.book Page 1 Monday, April 17, 2006 11:26 AM