1. Remove:
- Side cowlings
- Lower cowlings
Refer to "GENERAL CHASSIS".
2. Remove:
- Fuel tank
Refer to "FUEL TANK".
3. Remove:
- Air filter case
Refer to "AIR FILTER CASE".
4. Remove:
- Radiator
- Radiator fan
Refer to "RADIATOR".
5. Disconnect:
- Ignition coil
6. Remove:
- Spark plug
Notice: Before removing the spark plugs, blow away any dirt accumulated in the spark plug wells with compressed air to prevent it from falling into the cylinders.
7. Check:
- Spark plug type Incorrect → Change.
Manufacturer/model NGK/LMAR9E-J
8. Check:
- Electrode "1"
Damage/wear → Replace the spark plug.
- Insulator "2"
Abnormal color → Replace the spark plug.
Normal color is medium-to-light tan.
9. Clean:
- Spark plug (with a spark plug cleaner or wire brush)
10. Measure:
- Spark plug gap "a" (with a wire thickness gauge) Out of specification → Regap.
Spark plug gap 0.6-0.7 mm (0.024-0.028 in)
![](https://motoinstruction.ru/img/yamaha/20/126298.jpg)
11. Install:
- Spark plug
Spark plug 13 Nm (1.3 m·kgf, 9.4 ft·lbf)
Before installing the spark plug, clean the spark plug and gasket surface.
12. Install:
- Ignition coil
13. Install:
- Radiatorfan
- Radiator
Refer to "RADIATOR".
14. Install:
- Air filter case
Refer to "AIR FILTER CASE".
15. Install:
- Fuel tank
Refer to "FUEL TANK".
16. Install:
- Lower cowlings
- Side cowlings
Refer to "GENERAL CHASSIS".