1998 YAMAHA TW200 engine

6-5
PERIODIC MAINTENANCE AND MINOR REPAIR
1
2
3
4
5
6
7
8
9
*: Since these items require special tools, data and technical skills, they should be serviced by a Yamaha dealer.EAU00479
NOTE:
The air filter needs more frequent service if you are riding in unusually wet or dusty areas.
EVERY
6,000 km 12,000 km
No. ITEM CHECKS AND MAINTENANCE JOBSInitial or or
(1,000 km) 6 months 12 months
(Whichever (Whichever
comes first) comes first)
9Check oil level and vehicle for oil leakage.
23 Engine oil9Correct if necessary.√√√
9Change. (Warm engine before draining.)
24Engine oil filter element9Clean or replace if necessary.√√
25
*
Engine oil strainer9Clean or replace if necessary.√√
5FY-28199-EX (TW200) 4/16/02 5:38 PM Page 34

6-7
PERIODIC MAINTENANCE AND MINOR REPAIR
1
2
3
4
5
6
7
8
9
1
1. Panel A
EAU00494Panel A
To remove:
Pull outward on the areas shown.
To install:
Place the panel in its original posi-
tion.
1
EAU00495Spark plug inspection
The spark plug is an important
engine component and is easy to
inspect. The condition of the spark
plug can indicate the condition of
the engine. The ideal color on the
white insulator around the center
electrode 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 period-
ically remove and inspect the spark
plug because heat and deposits
will cause the spark plug to slowly
1. Spark plug gap
12
1. Panel B
2. Screw (×2)
EAU01345Panel B
To remove:
Remove the screws and pull out-
ward on the areas shown.
To install:
Place the panel in the original posi-
tion and install the screws.
5FY-28199-EX (TW200) 4/16/02 5:38 PM Page 36

6-8
PERIODIC MAINTENANCE AND MINOR REPAIR
6 break down and erode. If electrode
erosion becomes excessive, or if
carbon and other deposits are
excessive, you should replace the
spark plug with the specified plug.
Before installing the spark plug,
measure the electrode gap with a
wire thickness gauge; adjust the
gap to specification as necessary.
When installing the plug, always
clean the gasket surface and use a
new gasket. Wipe off any grime
from the threads and tighten the
spark plug to the specified torque.Specified spark plug:
DR8EA (NGK) or
X24ESR-U (DENSO)Spark plug gap:
0.6 ~ 0.7 mm
Tightening torque:
Spark plug:
17.5 Nm (1.75 m0kg)
NOTE:
If a torque wrench is not available
when you are installing a spark
plug, a good estimate of the cor-
rect torque is 1/4 to 1/2 turn past
finger tight. Have the spark plug
tightened to the specified torque as
soon as possible.EAU00517Engine oil
1. Oil level measurement
a. Place the motorcycle on a level
place and hold it in an upright
position. Warm up the engine
for several minutes.
NOTE:
Be sure the motorcycle is posi-
tioned straight up when checking
the oil level. A slight tilt toward the
side can result in false readings.
5FY-28199-EX (TW200) 4/16/02 5:38 PM Page 37

6-9
PERIODIC MAINTENANCE AND MINOR REPAIR
1
2
3
4
5
6
7
8
9
1
2. Engine oil replacement
a. Warm up the engine for a few
minutes.
b. Stop the engine. Place an oil
pan under the engine and
remove the oil filler cap.
1. Oil filler cap
2
3 1
b. With the engine stopped,
check the oil level through the
level window located at the
lower part of the right side
crankcase cover.
NOTE:
Wait a few minutes until the oil
level settles before checking.
c. The oil level should be
between the maximum and
minimum marks. If the level is
low, add sufficient oil to raise
it to the proper level.
1. Level window
2. Maximum level mark
3. Minimum level mark
1
c. Remove the drain plug and
drain bolt.
1. Drain plug
5FY-28199-EX (TW200) 4/16/02 5:38 PM Page 38

6-11
PERIODIC MAINTENANCE AND MINOR REPAIR
1
2
3
4
5
6
7
8
9i. Fill the engine with oil. Install
the oil filler cap and tighten.
EC000066
cC
8Do not put in any chemical
additives. Engine oil also lubri-
cates the clutch and additives
could cause clutch slippage.
8Be sure no foreign material
enters the crankcase.
Recommended oil:
See page 8-1
Oil quantity:
Total amount:
1.3 L
Periodic oil change:
1.0 L
With oil filter replacement:
1.1 LTightening torque:
Drain plug:
10 Nm (1.0 m0kg)
Filter cover screw:
10 Nm (1.0 m0kg)
Drain bolt (filter cover):
10 Nm (1.0 m0kg)j. Start the engine and warm up
for a few minutes. While
warming up, check for oil leak-
age. If oil leakage is found,
stop the engine immediately
and check for the cause.
5FY-28199-EX (TW200) 4/16/02 5:38 PM Page 40

6-12
PERIODIC MAINTENANCE AND MINOR REPAIR
1
2
3
4
5
6
7
8
9
EAU01094Air filter
The air filter should be cleaned at
the specified intervals. It should be
cleaned more frequently if you are
riding in unusually wet or dusty
areas.
1. Remove panel B. (See page 6-7
for panel removal and installa-
tion procedures.)
2. Remove the air filter case fit-
ting screws and the air filter
case cover.
1
1. Air filter
3. Remove the air filter from its
case and clean it with solvent.
After cleaning, remove the
remaining solvent by squeez-
ing the air filter.
4. Apply the recommended oil to
the entire surface of the filter
and squeeze out the excess oil.
It should be wet but not drip-
ping.
1
1. Screw (×4)
Recommended oil:
Same as engine oil
5. Install the air filter in its case.
6. Install panel B.
EC000085
cC
8Make sure the air filter is prop-
erly seated in the filter case.
8The engine should never be
run without the air filter
installed. Excessive piston
and/or cylinder wear may
result.
5FY-28199-EX (TW200) 4/16/02 5:38 PM Page 41

6-13
PERIODIC MAINTENANCE AND MINOR REPAIR
1
2
3
4
5
6
7
8
9
EAU00629Carburetor adjustment
The carburetor is a vital part of the
engine and requires very sophisti-
cated adjustment. Most adjust-
ments should be left to a Yamaha
dealer who has the professional
knowledge and experience to do
so. However, the following may be
serviced by the owner as part of
routine maintenance.
EC000094
cC
The carburetor was set at the
Yamaha factory after many tests. If
the settings are changed, poor
engine performance and damage
may result.
EAU01168Idle speed adjustment
NOTE:
A diagnostic tachometer must be
used for this procedure.
1. Attach the tachometer. Start
the engine and warm it up for
a few minutes at approximate-
ly 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.
b
a1
1. Throttle stop screw
2. Set the idle to the specified
engine speed by adjusting the
throttle stop screw. Turn the
screw in direction ato
increase engine speed and in
direction bto decrease engine
speed.
NOTE:
If the specified idle speed cannot
be obtained by performing the
above adjustment, consult a
Yamaha dealer.
Standard idle speed:
1,350 ~ 1,450 r/min
5FY-28199-EX (TW200) 4/16/02 5:38 PM Page 42

6-14
PERIODIC MAINTENANCE AND MINOR REPAIR
1
2
3
4
5
6
7
8
9
EAU00635
Throttle cable free play
inspection
There should be a free play of 2 ~ 5
mm at the throttle grip. If the free
play is incorrect, ask a Yamaha
dealer to make this adjustment.
EAU00636Cam chain adjustment
The cam chain becomes loose with
use, resulting in improper valve
timing and engine noise. To pre-
vent this, the cam chain tensioner
must be adjusted regularly. This
adjustment, however, should be
left to a professional Yamaha ser-
vice technician.
EAU00637
Valve clearance adjustment
The correct valve clearance
changes with use, resulting in
improper fuel/air supply or engine
noise. To prevent this, the valve
clearance must be adjusted regu-
larly. This adjustment however,
should be left to a professional
Yamaha service technician.
5FY-28199-EX (TW200) 4/16/02 5:38 PM Page 43