Yamaha EF4500iSE - Inverter Generator Owner's Manual download pdf (Page 28)

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760-7XF

760-001a

Spark plug inspection

The spark plug is an important engine component,

which should be checked periodically.

1. Remove the screws, and then pull outward on the

areas of front cover shown.

1 Screws

2 Front cover

2. Remove the spark plug cap and then remove the

spark plug.

3. 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.

4. Check the spark plug type and gap.

a Gap

TIP

The spark plug gap should be measured with a wire

thickness gauge and, if necessary, adjusted to specifi-

cation.

Standard spark plug:

BPR4ES (NGK)

Spark plug gap:

0.7–0.8 mm (0.028–0.031 in)

788-7XFa

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Yamaha EF4500iSE - Inverter Generator Owner's Manual Page 28