1. Remove:
- Radiator upper bolts
- Radiator lower bolt. Refer to «Radiator».
2. Remove:
- Ignition coils
- Spark plugs
Caution! 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.
3. Check:
- Spark plug type. Incorrect → Change.
Spark plug type (manufacturer) — CR9EK (NGK).
4. Check:
- Electrode "1". Damage/wear → Replace the spark plug.
- Insulator "2". Abnormal color → Replace the spark plug.
Normal color is medium-to-light tan.
5. Clean:
- Spark plug (with a spark plug cleaner or wire brush)
6. Measure:
- Spark plug gap "a" (with a wire thickness gauge). Out of specification → Regap.
Spark plug gap — 0.6-0.7 mm (0.0236-0.0276 in).
![](https://motoinstruction.ru/img/yamaha/3/111706.jpg)
7. Install:
- Spark plugs
- Ignition coils
Spark plug — 13 Nm (1.3 m·kg, 9.4 ft·lb)
Note: Before installing the spark plug, clean the spark plug and gasket surface.
8. Install:
- Radiator upper bolts
- Radiator lower bolt. Refer to «Radiator».