#2 (Front) Spark plug Removal
- Remove the frame side covers. (9-5)
- Remove the fuel tank. (6-3)
- Remove the right frame head cover and right radiator cover. (9-6)
- Disconnect lead wire coupler 1 from ignition coil/plug cap.
Caution: Disconnect the lead wire coupler before removing the ignition coil/plug cap to avoid lead wire coupler damage.
- Remove the ignition coil/plug cap 1.
Caution:
- Do not pry up the ignition coil/plug cap with a screw driver or a bar to avoid its damage.
- Be careful not to drop the ignition coil/plug cap to prevent short/open circuit.
- Remove the spark plug with a spark plug wrench.
- Remove the right cylinder head cover cap 2.
Note: Indicates hook location.
- Remove the spark plug cap 3.
- Remove the spark plug with a spark plug wrench.
#1 (Rear) Spark plug Removal
- Remove the frame side covers. (9-5)
- Remove the fuel tank. (6-3)
- Disconnect lead wire coupler 4 from ignition coil/plug cap.
Caution: Disconnect the lead wire coupler before removing the ignition coil/plug cap to avoid lead wire coupler damage.
- Remove the ignition coil/plug cap 5.
Caution:
- Do not pry up the ignition coil/plug cap with a screw driver or a bar to avoid its damage.
- Be careful not to drop the ignition coil/plug cap to prevent short/open circuit.
- Remove the spark plug with a spark plug wrench.
- Remove the left cylinder head cover cap 6.
Note: Indicates hook location.
- Remove the spark plug cap 7.
- Remove the spark plug with a spark plug wrench.
Heat range
- Check spark plug heat range by observing electrode color. If the electrode of the spark plug is wet appearing or dark color, replace the spark plug with hotter type one. If it is white or glazed appearing, replace the spark plug with colder type one.
| Hot type | Standard | Cold type | |
| NGK | CR7EK | CR8EK | CR9EK |
| ND | U22ETR | U24ETR | U27ETR |
Note: "R" type spark plug has a resistor built into at the center electrode to prevent radio noise.
Carbon deposits
- Check carbon deposits on the spark plug.
- If carbon is deposited, remove it using a spark plug cleaner machine or carefully use a tool with a pointed end.
Spark plug gap
- Measure the spark plug gap with a thickness gauge.
- Adjust the spark plug gap if necessary.
Spark plug gap А:
Standard: 0.6 - 0.7 mm (0.024 - 0.028 in)
09900-20803: Thickness gauge
Electrode's condition
- Check the condition of the electrode.
- If it is extremely worn or burnt, replace the spark plug. Replace the spark plug if it has a broken insulator, damaged thread, etc.
Caution: Confirm the thread size and reach when replacing the plug. If the reach is too short, carbon will be deposited on the screw portion of the plug hole and engine damage may result.
Spark plug installation
- Screw the spark plugs into the cylinder head with fingers, and then tighten them to the specified torque.
Spark plug: 11 Nm (1.1 kgf·m, 8.0 lb·ft)
Caution: Do not cross thread or over tighten the spark plug, or such an operation will damage the aluminum threads of the cylinder head.
Ignition coil/plug cap installation
- Install the ignition coils/plug caps and connect their lead wire couplers.
Caution:
- Do not hit the ignition coil/plug cap with a plastic hammer when installing it.
- Place the ignition coil/spark plug cap so that the coupler does not touch the cylinder head cover.
