Yamaha 2003 Royal Star Venture Owner's Manual download pdf (Page 93)

PERIODIC MAINTENANCE AND MINOR REPAIR

7-12

NOTE:

If any spark plug shows a distinctly dif-

ferent color, the engine could be defec-

tive. Do not attempt to diagnose such

problems yourself. Instead, have a

Yamaha dealer check the motorcycle.

3. Check each spark plug for elec-

trode erosion and excessive car-

bon or other deposits, and replace

it if necessary.

To install a spark plug

1. Measure the spark plug gap with a

wire thickness gauge and, if nec-

essary, adjust the gap to specifica-

tion.

2. Clean the surface of the spark

plug gasket and its mating sur-

face, and then wipe off any grime

from the spark plug threads.

3. Install the spark plug with the

spark plug wrench, and then tight-

en it to the specified torque.

NOTE:

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 speci-

fied torque as soon as possible.

4. Install the spark plug cap.

Specified spark plug:

DPR8EA-9 (NGK) or

X24EPR-U9 (DENSO)

a. Spark plug gap

Spark plug gap:

0.03–0.04 in (0.8–0.9 mm)

Tightening torque:

Spark plug:

12.5 ft·lbf (1.75 m·kgf, 17.5 Nm)

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Yamaha 2003 Royal Star Venture Owner's Manual Page 93