Yamaha 2004 Royal Star Venture Owner's Manual download pdf (Page 77)

PERIODIC MAINTENANCE AND MINOR REPAIR

7-11

7

EAU19543

Checking the spark plugs

The spark plugs are important engine

components, which are easy to check.

Since heat and deposits will cause any

spark plug to slowly erode, the spark

plugs should be removed and checked

in accordance with the periodic mainte-

nance and lubrication chart. In addition,

the condition of the spark plugs can re-

veal the condition of the engine.

To remove a spark plug

1. Remove the spark plug cap.

2. Remove the spark plug as shown,

with the spark plug wrench includ-

ed in the owner’s tool kit.

To check the spark plugs

1. Check that the porcelain insulator

around the center electrode on

each spark plug is a medium-to-

light tan (the ideal color when the

vehicle is ridden normally).

2. Check that all spark plugs installed

in the engine have the same color.

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 vehicle.

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.

1. Spark plug cap

1. Spark plug wrench

Specified spark plug:

NGK/DPR8EA-9

DENSO/X24EPR-U9

1. Spark plug gap

Spark plug gap:

0.8–0.9 mm (0.031–0.035 in)

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