Yamaha NEO'S YN50 Owner's Manual download pdf (Page 41)

2. Check the spark plug for electro-

de erosion and excessive carbon

or other deposits, and replace it if

necessary.

To install the spark plug

1. Measure the spark plug gap with

a wire thickness gauge and, if

necessary, adjust the gap to spe-

cification.

1. Spark plug gap

2. Clean the surface of the spark

plug gasket and its mating surfa-

ce, and then wipe off any grime

from the spark plug threads.

3. Install the spark plug with the

spark plug wrench, and then

tighten it to the specified torque.

TIP

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. Howe-

ver, the spark plug should be tighte-

ned to the specified torque as soon

as possible.

4. Install the spark plug cap.

5. Install the panel.

EAU20065

Final transmission oil

The final transmission case must be

checked for oil leakage before each

ride. If any leakage is found, have a

Yamaha dealer check and repair the

scooter. In addition, the final trans-

mission oil must be changed as

follows at the intervals specified in the

periodic maintenance and lubrication

chart.

1. Start the engine, warm up the

final transmission oil by riding the

scooter for several minutes, and

then stop the engine.

2. Place the scooter on the centers-

tand.

3. Place an oil pan under the final

transmission case to collect the

used oil.

4. Remove the final transmission oil

filler cap and its O-ring from the

final transmission case.

5. Remove the final transmission oil

drain bolt and its gasket to drain

the oil from the final transmission

case.

Tightening torque:

Spark plug:

20 Nm (2.0 m•kgf, 14.5 ft•lbf)

Spark plug gap:

0.6–0.7 mm (0.024–0.028 in)

1

ZAUM0037

Specified spark plug:

YN50: NGK / BR8HS

YN50M: NGK / BPR4HS

PERIODIC MAINTENANCE AND ADJUSTMENT

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