Spark plug inspection. Yamaha MZ360

A

B a

7VB-F8199-11_E0.indd 32

Spark plug inspection

The spark plug is an important engine component, which should be checked periodically.

1. Remove the spark plug cap and the spark plug.

2. Check for discoloration and remove the carbon.

The porcelain insulator around the center electrode of spark plug should be a medium-to-light tan color.

A MZ175, MZ200

B Except for MZ175, MZ200

3. Check the spark plug type and gap.

a

Spark plug gap

Standard spark plug:

BPR4ES (NGK)

Spark plug gap:

0.7–0.8 mm (0.028–0.031 in)

TIP

The spark plug gap should be measured with a wire thickness gauge and, if necessary, adjusted to specification.

4. Install the spark plug and then tighten it.

Spark plug tightening torque:

20 Nm (2.0 m·kgf, 14 ft·lbf)

TIP

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 finger tight. However, the spark plug should be tightened to the specified torque as soon as possible.

5. Install the spark plug cap.

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2013/12/04 10:13:49