Page 61 of 99

PERIODIC MAINTENANCE AND MINOR REPAIR
6-15
6
EC000082
CAUTION:@ l
Make sure the air filter is prop-
erly seated in the air filter case.
l
The engine should never be run
without the air filter installed.
Excessive piston and/or cylin-
der wear may result.
@
EAU00630
Carburetor adjustmentThe carburetors are important parts of
the engine and require very sophisti-
cated adjustment. Most adjustments
should be left to a Yamaha dealer who
has the professional knowledge and
experience to do so. However, the idle
speed may be adjusted by the owner
as part of routine maintenance.
EC000095
CAUTION:@ The carburetors were set at the
Yamaha factory after many tests. If
they are changed, poor engine per-
formance and damage may result. @
EAU00632
Idle speed adjustment1. Start the engine and warm it up for
a few minutes at approximately
1,000 to 2,000 r/min. Occasionally
rev the engine to 4,000 to
5,000 r/min. The engine is warm
when it quickly responds to the
throttle.
2. Set the idle to the specified engine
speed by adjusting the throttle
stop screw. Turn the screw in di-
rection
a to increase engine
speed and in direction
b to de-
crease engine speed.1. Throttle stop screw
E_4tx_Periodic.fm Page 15 Saturday, October 16, 1999 9:37 AM
Page 90 of 99
SPECIFICATIONS
8-2
8
Air filterDry type element
Fuel
Type Regular unleaded gasoline
Fuel tank capacity 20 L
Reserve amount 3.1 L
Carburetor
Type ´ quantity BDSR38 ´ 2
Manufacturer MIKUNI
Spark plug
Manufacturer/Type NGK / DPR8EA-9 or
DENSO / X24EPR-U9
Gap 0.8 ~ 0.9 mm
Clutch typeWet, multiple-disc
Transmission
Primary reduction system Spur gear
Primary reduction ratio 1.718
Secondary reduction system Chain drive
Secondary reduction ratio 2.688
Number of sprocket teeth
(rear/front) 43/16
Transmission type Constant mesh 5-speed
Operation Left foot operationGear ratio
1st 2.643
2nd 1.947
3rd 1.500
4th 1.174
5th 0.964
Chassis
Frame type Diamond
Caster angle 24.5°
Trail 103 mm
Tires
Front
Type Tubeless
Size 110/80 ZR18 (58W)
Manufacturer/
model Bridgestone / BT54F
Michelin / MACADAM 90X
Pirelli / MTR03
Rear
Type Tubeless
Size 150/70 ZR17 (69W)
Manufacturer/
model Bridgestone / BT54R
Michelin / MACADAM 90X
Pirelli / MTR04
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Page 97 of 99

10-INDEXAAir filter .................................................. 6-13
Antitheft alarm (optional) ..........................3-5BBattery ................................................... 6-28
Brake and clutch lever lubrication........... 6-25
Brake and shift pedal lubrication ............ 6-25
Brake fluid replacement ......................... 6-23
Brake light switch adjustment ................. 6-21CCable inspection and lubrication ............ 6-24
Carburetor adjustment ........................... 6-15
Care.........................................................7-1
Changing the coolant ............................. 6-11
Checking the front and
rear brake pads ................................... 6-21
Clutch lever ..............................................3-8
Clutch lever free play adjustment ........... 6-19
Controls/Instruments ................................2-3
Coolant temperature indicator light...........3-2
Cooling system ...................................... 6-10
Cowling and panel removal and
installation .............................................6-5
Cowlings A and B ....................................6-5DDiagnosis device......................................3-5
Dimmer switch .........................................3-6
Drive chain lubrication ............................ 6-24
Drive chain slack adjustment.................. 6-23
Drive chain slack check.......................... 6-23
EEngine break-in ....................................... 5-5
Engine oil ................................................ 6-8
Engine overheating ................................. 6-34
Engine stop switch................................... 3-7FFront brake lever ..................................... 3-9
Front fork adjustment............................. 3-14
Front fork inspection .............................. 6-27
Fuel ....................................................... 3-11
Fuel gauge .............................................. 3-5
Fuel indicator light ................................... 3-3
Fuel tank breather hose
(for Germany only) .............................. 3-12
Fuel tank cap ......................................... 3-10
Fuse replacement.................................. 6-29GGive safety the right of way ..................... 1-1HHandlebar switches ................................. 3-6
Dimmer switch ................................... 3-6
Engine stop switch ............................. 3-7
Hazard switch .................................... 3-6
Horn switch ........................................ 3-6
Lights switch ...................................... 3-7
Pass switch ........................................ 3-6
Start switch ........................................ 3-7
Turn signal switch .............................. 3-6
Hazard switch .......................................... 3-6
Headlight bulb replacement ................... 6-30
Helmet holder ........................................ 3-13
High beam indicator light ..........................3-2
Horn switch ..............................................3-6IIdentification number records ...................9-1
Idle speed adjustment ............................6-15
Indicator lights ..........................................3-2
Coolant temperature indicator light .....3-2
Fuel indicator light...............................3-3
High beam indicator light ....................3-2
Neutral indicator light ..........................3-2
Turn indicator lights ............................3-2
Inspecting the brake fluid level ...............6-22KKey identification number .........................9-1LLeft view...................................................2-1
Lights switch ............................................3-7
Luggage strap holders ...........................3-17MMain switch/steering lock .........................3-1
Model label ..............................................9-2NNeutral indicator light ...............................3-2PPanels A and B ........................................6-6
Parking.....................................................5-6
Pass switch ..............................................3-6
Periodic maintenance and lubrication .......6-2
Pre-operation check list ............................4-1
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