1998 YAMAHA T105 engine

EAH92300Carburetor adjustment
The carburetor is a vital part of the engine
and requires very sophisticated adjust-
ment. Most adjustments should be left to a
Yamaha dealer who has the professional
knowledge and experience to do so.EAH92000Idle speed adjustment
1. Attach the tachometer.
2. Set the idle to the specified engine
speed by adjusting the throttle stop
screw; turn the screw in to increase
engine speed, and out to decrease en-
gine speed.
47
1Tachometer1Throttle stop screw
Standard idle speed:
1,400~1,600 r/min
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EAH20304Spark plug inspection
The spark plug is an important engine
component and is easy to inspect. The con-
dition of the spark plug can indicate the
condition of the engine. The ideal color on
the white insulator around the center elec-
trode is a medium-to-light tan color for a
motorcycle that is being ridden normally.
Do not attempt to diagnose any problems
yourself. Instead, take the motorcycle to a
Yamaha dealer. You should periodically re-
move and inspect the spark plug because
heat and deposits will cause the spark plug
to slowly break down and erode. If elec-
trode erosion becomes excessive, or if car-
bon and other deposits are excessive, you
should replace the spark plug with the
specified plug.
48
Standard spark plug:
C6HSA/NGK or U20FS-U/
NIPPONDENSO
1Spark plug gap
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EAK00000
CLEANING AND
STORAGE
EAK01302*A. CLEANING
Frequent, thorough cleaning of your mo-
torcycle will not only enhance its appear-
ance but will improve its general perfor-
mance and extend the useful life of many
components.
1. Rinse the dirt and degreaser off with a
garden hose.EUU34602cCExcessive hose pressure may cause water
seepage and deterioration of wheel bear-
ings, front fork, brakes, transmission seals
and electrical parts.2. After cleaning the motorcycle, dry all
surfaces with a chamois, clean towel,
or soft absorbent cloth.3. Dry the chain and lubricate it to pre-
vent rust.
4. Automotive-type wax may be applied
to all painted and chrome-plated sur-
faces. When finished, start the engine
and let it idle for several minutes.
EAK00700B. STORAGE
Long term storage (60 days or more) of
your motorcycle will require some preven-
tive procedures to guard against deteriora-
tion. After thoroughly cleaning the motor-
cycle, prepare for storage as follows:
1. Drain the fuel tank, fuel lines, and car-
buretor float bowl(s).
2. Remove the empty fuel tank, pour a
cup of SAE 10W30 or 20W40 motor oil
in the tank, shake the tank to coat the
inner surfaces thoroughly and drain
off the excess oil. Reinstall the tank.
64
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66
Model
Dimensions:
Overall length 1,870 mm
Overall width 655 mm
Overall height 1,050 mm
Seat height 755 mm
Wheelbase 1,190 mm
Minimum ground clearance 130 mm
Basic weight:
With oil and full fuel tank 96 kg
Minimum turning radius: 1,800 mm
Engine:
Type Air cooled 4 stroke, SOHC
Cylinder arrangement Forward inclined single cylinder
Displacement 101.8 cm
3
Bore
×stroke 49.0
×54.0 mm
Compression ratio 9.0 : 1
Starting system Electric and kick starter
Lubrication system: Wet sump
SPECIFICATIONS
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67
Model
Engine oil (4-cycle):
Type Yamalibe 4 (20W40) or equivalent
SAE 20W40 type SE motor oil
Capacity
Periodic oil change 0.8 L
Total amount 1.0 L
Air filter: Wet type element
Fuel:
Type Regular gasoline
Tank capacity 4.3 L
Reserve amount
Carburetor:
Type/manufacturer VM16SH/MIKUNI
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