PERIODIC MAINTENANCE AND MINOR REPAIR

11

2.Check the spark plug for elec- trode erosion and excessive carbon or other deposits, and replace it if necessary.

Specified spark plug:

BPR7HS(NGK)

To install the spark plug

1. Spark plug wrench

To remove the spark plug

1. Remove panel A. (See page 6-5 for panel removal and installa-

6tion procedures.)

2.Remove the spark plug cap.

3.Remove the spark plug as shown, with the spark plug wrench included in the owner’s tool kit.

1. Spark plug gap

To check the spark plug

1.Check that the porcelain insu- lator around the center elec- trode of the spark plug is a me- dium-to-light tan (the ideal color when the scooter is rid- den normally).

NOTE:

If the spark plug shows a distinctly different color, the engine could be defective. Do not attempt to diagnose such problems yourself. In- stead, have a Yamaha dealer check the scooter.

1.Measure the spark plug gap with a wire thickness gauge and, if necessary, adjust the gap to specification.

Spark plug gap:

0.6 - 0.7 mm (0.024 - 0.028 in)

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 tighten it to the specified torque.

6-6