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Periodic maintenance
45
Spark plugs are produced in several different
thread lengths. The thread length or reach is
the distance from the spark plug gasket seat
to the end of the threaded portion. If the reach
is too long, overheating and engine damage
may result. If the reach is too short, spark plug
fouling and poor performance may result. Al-
so, if the reach is too short, carbon will form on
the exposed threads resulting in combustion
chamber hot spots and thread damage. Al-
ways use a spark plug with the specified
reach.
Before installing any spark plug, measure the
electrode gap with a wire thickness gauge
and adjust to specification.
When installing the spark plug, always clean
the gasket surface. Wipe off any grime from
the threads and tighten the spark plug to the
specified torque.
CAUTION:
ECS00380
Make sure that the spark plug caps are se-
curely installed. Otherwise the spark plug
caps could be damaged due to engine vi-
bration.
ESU12791
Adjusting the throttle cable free
play
1. Loosen the locknut.
2. Turn the adjusting bolt in or out until the
specified throttle cable free play is ob-
tained.
3. Tighten the locknut.
ESU11861
Checking the throttle override
system (T.O.R.S.)
Check the T.O.R.S. for proper operation.
Specified spark plug:
Manufacturer:
NGK
Model:
CR9E
Spark plug reach:
19.0 mm (0.75 in)
1. Spark plug gap
2. Spark plug reach
Spark plug gap:
0.7–0.8 mm (0.028–0.031 in)
Spark plug tightening torque:
12.5 Nm (1.25 m·kgf, 9 ft·lb)
1. Locknut
2. Throttle cable free play adjusting bolt
3. Throttle cable free play
Throttle cable free play:
3.0–4.0 mm (0.12–0.16 in)
U8GL10E0.book Page 45 Friday, May 18, 2007 3:17 PM