2004 YAMAHA XT660R maintenance

PERIODIC MAINTENANCE AND MINOR REPAIR
6-5
6
EAU18711
Removing and installing
cowlings and panels The cowlings and panels shown need
to be removed to perform some of the
maintenance jobs described in this
chapter. Refer to this section each time
a cowling or panel needs to be re-
moved and installed.
EAUM1682
Cowling A
To remove the cowlingRemove the bolts and spacers, and
then lift the cowling up to remove it.To install the cowling
1. Place the cowling bracket tab be-
tween the protector and the brack-
et on each side.
1. Cowling A
1. Panel A
1. Cowling B
2. Panel B
1. Bolt
1. Protector
2. Cowling bracket tab
3. Bracket

PERIODIC MAINTENANCE AND MINOR REPAIR
6-6
62. Place the cowling in the original
position, and then install the bolts
and spacers.
EAUM1691
Cowling B
To remove the cowling1. Remove the seat and panel B.
(See pages 3-12 and 6-5.)
2. Remove the bolts, remove the
quick fastener screws after turning
them 1/4 turn counterclockwise,
and then pull the cowling off at the
area shown.To install the cowling
1. Place the cowling in the original
position, and then tighten the quick
fastener screws and install the
bolts.
2. Install the panel.
3. Install the seat.
EAUM1701
Panel A
To remove the panel1. Remove the seat. (See page
3-12.)
2. Remove the bolts and the spacer,
and then pull the panel off at the
area shown.To install the panel
1. Place the panel in the original posi-
tion, install spacer, and then install
the bolts.
2. Install the seat.
1. Bolt
2. Quick fastener screw
1. Bolt
2. Spacer

PERIODIC MAINTENANCE AND MINOR REPAIR
6-7
6
EAUM1710
Panel B
To remove the panel1. Remove the seat. (See page
3-12.)
2. Remove the bolt, and then pull the
panel off at the areas shown.
To install the panel1. Place the panel in the original posi-
tion, and then install the bolt.2. Install the seat.
EAU19602
Checking the spark plug The spark plug is an important engine
component, which is easy to check.
Since heat and deposits will cause any
spark plug to slowly erode, the spark
plug should be removed and checked
in accordance with the periodic mainte-
nance and lubrication chart. In addition,
the condition of the spark plug can re-
veal the condition of the engine.
To remove the spark plug
1. Remove the spark plug cap.
2. Remove the spark plug as shown,
with the spark plug wrench includ-
ed in the owner’s tool kit.
1. Bolt
1. Spark plug cap

PERIODIC MAINTENANCE AND MINOR REPAIR
6-8
6To check the spark plug
1. Check that the porcelain insulator
around the center electrode of the
spark plug is a medium-to-light tan
(the ideal color when the vehicle is
ridden normally).
NOTE:
If the spark plug shows a distinctly dif-
ferent color, the engine could be defec-
tive. Do not attempt to diagnose such
problems yourself. Instead, have aYamaha dealer check the vehicle.
2. Check the spark plug for electrode
erosion and excessive carbon or
other deposits, and replace it if
necessary.To install the spark plug
1. Measure the spark plug gap with a
wire thickness gauge and, if nec-
essary, adjust the gap to specifica-
tion.
2. Clean the surface of the spark plug
gasket and its mating surface, and
then wipe off any grime from the
spark plug threads.3. Install the spark plug with the
spark plug wrench, and then tight-
en it to the specified torque.
NOTE:
If a torque wrench is not available when
installing a spark plug, a good estimate
of the correct torque is 1/4–1/2 turn
past finger tight. However, the spark
plug should be tightened to the speci-fied torque as soon as possible.
4. Install the spark plug cap.
1. Spark plug wrench
Specified spark plug:
NGK/CR7E1. Spark plug gapSpark plug gap:
0.7–0.8 mm (0.028–0.031 in)
Tightening torque:
Spark plug:
12.5 Nm (1.25 m·kgf, 9.0 ft·lbf)

PERIODIC MAINTENANCE AND MINOR REPAIR
6-9
6
EAUM1841
Engine oil and oil filter
element The engine oil level should be checked
before each ride. In addition, the oil
must be changed and the oil filter ele-
ment replaced at the intervals specified
in the periodic maintenance and lubri-
cation chart.
To check the engine oil level
1. Place the vehicle on a level sur-
face and hold it in an upright posi-
tion.NOTE:
Make sure that the vehicle is positioned
straight up when checking the oil level.
A slight tilt to the side can result in afalse reading.
2. Start the engine, warm it up for 10–
15 minutes, and then turn it off.
3. Wait a few minutes until the oil set-
tles, remove the oil filler cap, wipe
the dipstick clean, insert it back
into the oil filler hole (without
screwing it in), and then remove it
again to check the oil level.
NOTE:

The engine oil tank is located in-
side of the frame.


The engine oil should be between
the minimum and maximum levelmarks.
CAUTION:
ECA10010
Do not operate the vehicle until you
know that the engine oil level is suf-ficient.
WARNING
EWA10360
Never remove the engine oil tank
cap after high-speed operation, oth-
erwise hot engine oil could spout
out and cause damage or injury. Al-
ways let the engine oil cool down
sufficiently before removing the oiltank cap.
4. If the engine oil is below the mini-
mum level mark, add sufficient oil
of the recommended type to raise
it to the correct level.
5. Install the oil filler cap.
To change the engine oil (with or
without oil filter element replace-
ment)
1. Start the engine, warm it up for
several minutes, and then turn it
off.
2. Install the engine oil drain attach-
ment, provided with the owner’s
tool kit, under the drain bolt of the
crankcase.
1. Engine oil filler cap
2. Maximum level mark
3. Minimum level mark

PERIODIC MAINTENANCE AND MINOR REPAIR
6-10
63. Place an oil pan under the engine
to collect the used oil.
4. Remove the engine oil filler cap
and the drain bolt to drain the oil
from the crankcase.
5. Remove the drain bolt to drain the
oil from the oil tank.6. Remove the oil filter element drain
bolt to drain the oil from the oil filter
element.
NOTE:
Skip steps 7–9 if the oil filter element isnot being replaced.
7. Remove the oil filter element cover
by removing the bolts.8. Remove and replace the oil filter
element and O-rings.
1. Engine oil drain bolt (crankcase)
2. Engine oil drain attachment
1. Engine oil drain bolt (oil tank)
1. Oil filter element cover bolt
2. Oil filter element drain bolt
1. Oil filter element
2. O-ring

PERIODIC MAINTENANCE AND MINOR REPAIR
6-11
6 9. Install the oil filter element cover by
installing the bolts and the oil filter
element drain bolt, then tightening
them to the specified torques.
NOTE:Make sure that the O-rings are properlyseated.
10. Install the oil drain bolts, and then
tighten them to the specified
torques.
11. Add the specified amount of the
recommended engine oil, and then
install and tighten the oil filler cap.
CAUTION:
ECAM1060
The engine oil tank must be filled in
2 steps. First, fill the engine oil tank
with 1.90 L (2.0 US qt) (1.67 Imp.qt) of
the recommended engine oil. Then,
start the engine, race it 5 or 6 times,
turn it off, and then add the remain-der of the engine oil.CAUTION:
ECA11620


In order to prevent clutch slip-
page (since the engine oil also
lubricates the clutch), do not
mix any chemical additives. Do
not use oils with a diesel speci-
fication of “CD” or oils of a high-
er quality than specified. Inaddition, do not use oils labeled
“ENERGY CONSERVING II” or
higher.


Make sure that no foreign mate-rial enters the crankcase.
12. Start the engine, and then let it idle
for several minutes while checking
it for oil leakage. If oil is leaking, im-
mediately turn the engine off and
check for the cause.
13. Turn the engine off, and then
check the oil level and correct it if
necessary.
Tightening torques:
Oil filter element cover bolt:
10 Nm (1.0 m·kgf, 7.2 ft·lbf)
Oil filter element drain bolt:
10 Nm (1.0 m·kgf, 7.2 ft·lbf)
Tightening torques:
Engine oil drain bolt (crankcase):
30 Nm (3.0 m·kgf, 22 ft·lbf)
Engine oil drain bolt (oil tank):
18 Nm (1.8 m·kgf, 13 ft·lbf)
Recommended engine oil:
See page 8-1.
Oil quantity:
Without oil filter element replace-
ment:
2.50 L (2.64 US qt) (2.20 Imp.qt)
With oil filter element replacement:
2.60 L (2.75 US qt) (2.29 Imp.qt)

PERIODIC MAINTENANCE AND MINOR REPAIR
6-12
6
EAU20070
Coolant The coolant level should be checked
before each ride. In addition, the cool-
ant must be changed at the intervals
specified in the periodic maintenance
and lubrication chart.
EAUM1721
To check the coolant level
1. Place the vehicle on a level sur-
face and hold it in an upright posi-
tion.NOTE:

The coolant level must be checked
on a cold engine since the level
varies with engine temperature.


Make sure that the vehicle is posi-
tioned straight up when checking
the coolant level. A slight tilt to theside can result in a false reading.
2. Check the coolant level in the cool-
ant reservoir.
NOTE:The coolant should be between theminimum and maximum level marks.3. If the coolant is at or below the
minimum level mark, remove cowl-
ing B (See page 6-5.), and then
open the reservoir cap.
4. Add coolant to the maximum level
mark, and then close the reservoir
cap.
CAUTION:
ECA10470


If coolant is not available, use
distilled water or soft tap water
instead. Do not use hard water
or salt water since it is harmful
to the engine.


If water has been used instead
of coolant, replace it with cool-
ant as soon as possible, other-
wise the engine may not be
sufficiently cooled and the cool-
ing system will not be protected
against frost and corrosion.


If water has been added to the
coolant, have a Yamaha dealer
check the antifreeze content of
the coolant as soon as possible,
otherwise the effectiveness ofthe coolant will be reduced.WARNING
EWA10380
Never attempt to remove the radiatorcap when the engine is hot.
5. Install the cowling.
1. Coolant reservoir
2. Maximum level mark
3. Minimum level markCoolant reservoir capacity (up to the
maximum level mark):
0.25 L (0.26 US qt) (0.22 Imp.qt)