Yamaha VMX17Y(C) User Manual download pdf (Page 62)

PERIODIC MAINTENANCE AND ADJUSTMENT

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2

3

4

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Panel C

To remove the panel

1. Remove the bolt.

2. Pull the panel upward.

To install the panel

Place the panel in the original position,

and then install the bolt.

EAU46680

Checking the spark plugs

The spark plugs are important engine

components, which should be checked

periodically, preferably by a Yamaha

dealer. Since heat and deposits will

cause any spark plug to slowly erode,

they 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.

The porcelain insulator around the cen-

ter electrode of each spark plug should

be a medium-to-light tan (the ideal color

when the vehicle is ridden normally),

and all spark plugs installed in the en-

gine should have the same color. If any

spark plug shows a distinctly different

color, the engine could be operating im-

properly. Do not attempt to diagnose

such problems yourself. Instead, have

a Yamaha dealer check the vehicle.

If a spark plug shows signs of electrode

erosion and excessive carbon or other

deposits, it should be replaced.

Before installing a spark plug, the spark

plug gap should be measured with a

wire thickness gauge and replaced if

out of specification.

Clean the surface of the spark plug

gasket and its mating surface, and then

wipe off any grime from the spark plug

threads.

1. Panel C

2. Bolt

1

2

Specified spark plug:

NGK/CR9EIA

DENSO/IU27D

1. Spark plug gap

Spark plug gap:

0.8–0.9 mm (0.031–0.035 in)

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