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760-001a
Spark plug inspection
The spark plug is important engine components, which
should be checked periodically.
1. Remove the spark plug cap and the spark plug.
1 Spark plug cap
2 Spark plug
2. Check for discoloration and remove the carbon.
The porcelain insulator around the center elec-
trode of spark plug should be a medium-to-light
tan color.
3. Check the spark plug type and gap.
Standard spark plug:
BPR4ES (NGK)
Spark plug gap:
0.7–0.8 mm (0.028–0.031 in)
a Spark plug gap
TIP
The spark plug gap should be measured with a wire
thickness gauge and, if necessary, adjusted to specifi-
cation.
4. Install the spark plug.
Spark plug tightening torque:
20 Nm (2.0 m·kgf, 14 ft·lbf)
Carburetor adjustment
The carburetor is a vital part of the engine. Adjusting
should be left to a Yamaha dealer with the professional
knowledge, specialized data, and equipment to do so
properly.
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