Yamaha BWS YW100E Owner's Manual download pdf (Page 35)

PERIODIC MAINTENANCE AND MINOR REPAIR

6-8

The ideal color on the white insula-

tor a round the center electrode is a

medium-to-light tan color for a

scooter that is being ridden nor-

mally.

Do not attempt to diagnose such

problems yourself. Instead, take the

scooter to a Yamaha dealer . You

should periodically remove and in-

spect the spark plug because heat

and deposits will cause any spark

plug to slowly break down and

erode. If electrode erosion becomes

excessive, or if carbon and other

deposits are excessive, you should

replace the spark plug.

Specified spark plug:

BPR7HS (NGK)

Installation

1. Measure the electrode gap with

a wire thickness gauge and, if

necessary, adjust the gap to

specification.

Spark plug gap:

0.9 ~ 1.0 mm

2. Clean the gasket surface. Wipe

off any grime from the threads.

3. Install the spark plug and tighten

it to the specified torque, then

replace the spark plug cap.

1. Spark plug gap

1

Tightening torque:

Spark plug:

20 Nm (2.0 mkg)

NOTE:

If a torque wrench is not available

when you are installing a sprark

plug, a good estimate of the correct

torque is 1/4 to 1/2 turn past finger

tight. Have the spark plug tightened

to the specified torque as soon as

possible.

4. Install the panel.

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