spark plugs YAMAHA BT1100 2004 Owners Manual

6
Owner’s tool kit .............................................................. 6-1
Periodic maintenance and lubrication chart .................... 6-2
Removing and installing panels ...................................... 6-5
Checking the spark plugs ................................................ 6-5
Engine oil and oil filter element ........................................ 6-7
Final gear oil .................................................................... 6-9
Cleaning the air filter element .......................................... 6-10
Adjusting the carburetors ................................................ 6-12
Adjusting the engine idling speed .................................... 6-12
Adjusting the throttle cable free play................................ 6-13
Adjusting the valve clearance .......................................... 6-13
Tires ................................................................................ 6-14
Cast wheels .................................................................... 6-16
Adjusting the clutch lever free play .................................. 6-17
Adjusting the brake pedal position .................................. 6-18
Checking the front and rear brake pads .......................... 6-19
Checking the brake fluid level .......................................... 6-19
Changing the brake fluid .................................................. 6-21
Adjusting the shift pedal position .................................... 6-21
Checking and lubricating the cables ................................ 6-22Checking and lubricating the
throttle grip and cable ...................................................... 6-22
Checking and lubricating the brake and shift
pedals .............................................................................. 6-23
Checking and lubricating the brake and
clutch levers .................................................................... 6-23
Checking and lubricating the sidestand .......................... 6-24
Checking the front fork .................................................... 6-24
Checking the steering ...................................................... 6-25
Checking the wheel bearings .......................................... 6-25
Battery ............................................................................ 6-26
Replacing the fuses ........................................................ 6-28
Replacing the headlight and auxiliary light bulb .............. 6-29
Replacing a turn signal light bulb .................................... 6-31
Replacing the tail/brake light bulb .................................... 6-31
Replacing the license plate light bulb .............................. 6-32
Front wheel ...................................................................... 6-32
Rear wheel ...................................................................... 6-33
Troubleshooting .............................................................. 6-35
Troubleshooting chart ...................................................... 6-36
PERIODIC MAINTENANCE AND MINOR REPAIREAU00462

EAU00462PERIODIC MAINTENANCE AND MINOR REPAIR
12
1
2
1. Rear cylinder spark plug cover
2. Spark plug cap1. Front cylinder spark plug cover
2. Spark plug cap
To install the panel
Place the panel in the original position,
and then install the screw.
EAU01673
Checking the spark plugs
The spark plugs are important engine
components, which are easy to check.
Since heat and deposits will cause any
spark plug to slowly erode, the spark plugs
should be removed and checked in accor-
dance with the periodic maintenance and
lubrication chart. In addition, the condition
of the spark plugs can reveal the condition
of the engine.
EAU01122
Removing and installing panels
The panels shown above need to be re-
moved to perform some of the mainte-
nance jobs described in this chapter. Refer
to this section each time a panel needs to
be removed and installed.
EAU00488
Panel
To remove the panel
Remove the screw, and then pull the pan-
el off as shown. To remove a spark plug
1. Remove the appropriate spark plug
cover (rear right or front left) by
pulling it off as shown.
2. Remove the spark plug cap.
3. Remove the spark plug as shown,
with the spark plug wrench included
in the owner’s tool kit.
6-5
6
1
1. Panel mounting screw

EAU00462PERIODIC MAINTENANCE AND MINOR REPAIR
To install a spark plug
1. Measure the spark plug gap with a
wire thickness gauge and, if neces-
sary, adjust the gap to specification.
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 tighten 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 fin-
ger tight. However, the spark plug should
be tightened to the specified torque as
soon as possible.
4. Install the spark plug cap.
5. Place the spark plug cover in the orig-
inal position.
6-6
6
a. Spark plug gap
To check the spark plugs
1. Check that the porcelain insulator
around the center electrode on each
spark plug is a medium-to-light tan
(the ideal color when the motorcycle
is ridden normally).
2. Check that all spark plugs installed in
the engine have the same color.
NOTE:
If any spark plug shows a distinctly differ-
ent color, the engine could be defective.
Do not attempt to diagnose such problems
yourself. Instead, have a Yamaha dealer
check the motorcycle.
3. Check each spark plug for electrode
erosion and excessive carbon or oth-
er deposits, and replace it if neces-
sary.
Specified spark plug:
BPR7ES (NGK) or
W22EPR-U (DENSO)
Tightening torque:
Spark plug:
20 Nm (2.0 m·kgf)
Spark plug gap:
0.7-0.8 mm

EAU00462PERIODIC MAINTENANCE AND MINOR REPAIR
EAU01297
Troubleshooting chart
EW000125WARNING0
Keep away open flames and do not smoke while checking or working on the fuel system.
6-36
6
Check the fuel level in the
fuel tank.
1. Fuel
2. Compression
3. Ignition
4. BatteryThere is enough fuel.
There is no fuel.
Check the compression.
Supply fuel.The engine does not start. Check the compression.
There is compression.Check the ignition.
Have a Yamaha dealer check
the vehicle.
Wipe off with a dry cloth and correct the spark
plug gaps, or replace the spark plugs.Open the throttle halfway and operate the
electric starter.
Have a Yamaha dealer check
the vehicle.The engine does not start.
Check the battery.
The engine turns over slowly.
Have a Yamaha dealer check
the vehicle.
There is no compres-
sion.
Wet.
Dry
The engine turns over quickly.The battery is good.
Check the battery lead connections, and
charge the battery if necessary.The engine does not start.
Operate the electric
starter.
Remove the spark plugs
and check the electrodes.
Operate the electric
starter.

MOTORCYCLE CARE AND STORAGE
Storage
Short-term
Always store your motorcycle in a cool, dry
place and, if necessary, protect it against
dust with a porous cover.
ECA00014
•Storing the motorcycle in a poorly
ventilated room or covering it with
a tarp, while it is still wet, will allow
water and humidity to seep in and
cause rust.
•To prevent corrosion, avoid damp
cellars, stables (because of the
presence of ammonia) and areas
where strong chemicals are
stored.
CAUTION:Long-term
Before storing your motorcycle for several
months:
1. Follow all the instructions in the
“Care” section of this chapter.
2. For motorcycles equipped with a fuel
cock that has an “OFF” position: Turn
the fuel cock lever to “OFF”.
3. Drain the carburetor float chambers
by loosening the drain bolts; this will
prevent fuel deposits from building
up. Pour the drained fuel into the fuel
tank.
4. Fill up the fuel tank and add fuel sta-
bilizer (if available) to prevent the fuel
tank from rusting and the fuel from
deteriorating.
5. Perform the following steps to protect
the cylinders, piston rings, etc. from
corrosion.a. Remove the spark plug caps and
spark plugs.
b. Pour a teaspoonful of engine oil into
each spark plug bore.
c. Install the spark plug caps onto the
spark plugs, and then place the spark
plugs on the cylinder head so that the
electrodes are grounded. (This will
limit sparking during the next step).
d. Turn the engine over several times
with the starter. (This will coat the
cylinder walls with oil).
e. Remove the spark plug caps from the
spark plugs, and then install the spark
plugs and the spark plug caps.
EWA00003WARNING0
To prevent damage or injury from
sparking, make sure to ground the
spark plug electrodes while turning the
engine over.
7-4
7
EAU03412

INDEX
Periodic maintenance
and minor repair ..................................6-1
Pre-operation check list ..........................4-1
Pre-operation checks..............................4-1
R
Rear wheel
Installing ............................................6-34
Removing ..........................................6-33
S
Safety information ..................................1-1
Seat ......................................................3-13
Self-diagnosis device..............................3-6
Shift pedal ............................................3-10
Adjusting the pedal position ..............6-21
Shifting ....................................................5-3
Shock absorber assembly
adjusting ............................................3-15
Sidestand ..............................................3-16
Sidestand, checking
and lubricating ....................................6-24
Spark plugs, checking ............................6-5
Specifications..........................................8-1
Conversion table ..................................8-5
Speedometer unit ..................................3-3
Starter (choke) lever ............................3-12
Starting a cold engine ............................5-1
Starting a warm engine ..........................5-3
Start switch ............................................3-9
Steering, checking ................................6-25
Steering lock ..........................................3-1Storage ..................................................7-4
Storage compartment ..........................3-14
T
Tachometer ............................................3-6
Tail/brake light bulb, replacing ..............6-31
Throttle cable free play, adjusting ........6-13
Throttle grip and cable, checking and
lubricating ..........................................6-22
Tires ......................................................6-14
Air pressure ........................................6-14
Tool kit ....................................................6-1
Troubleshooting ....................................6-35
Troubleshooting chart ..........................6-36
Turn signal indicator light........................3-2
Turn signal light bulb, replacing............6-31
Turn signal switch ..................................3-8
V
Valve clearance, adjusting ....................6-13
Vehicle identification number ..................9-1
W
Wheel bearings, checking ....................6-25
Wheels, cast ........................................6-16