Adjusting The Engine Idling Speed (Rst9N) - Yamaha RS Venture RST9NJ Owner's Manual

Specified spark plug:
Manufacturer:
NGK
Model:
CR8E
EWS00711
WARNING
Be sure to use the specified spark plug
and spark plug cap. Otherwise, the
T.O.R.S. may not work properly.
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. Also, if the reach is too short, car-
bon will form on the exposed threads result-
ing in combustion chamber hot spots and
thread damage. Always use a spark plug with
the specified reach.
Spark plug reach:
19.0 mm (0.75 in)
1. Spark plug gap
2. Spark plug reach
Before installing any spark plug, measure the
spark plug gap with a wire thickness gauge
and adjust to specification.
Periodic maintenance and adjustment
Spark plug gap:
0.7–0.8 mm (0.028–0.031 in)
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.
Spark plug tightening torque:
13 N·m (1.3 kgf·m, 9.6 lb·ft)
ECS00383
NOTICE
Make sure that the spark plug caps are se-
curely installed. Otherwise the spark plug
caps could be damaged due to engine vi-
bration.
ESU11796
Adjusting the engine idling
speed (RST9N)
1. Place the snowmobile on a level surface
and apply the parking brake.
2. Start the engine and warm it up.
TIP
Refer to the "Starting the engine" section on
page 44.
3. Open the shroud.
4. Turn the throttle stop screw in or out to
adjust the engine idling speed.
1. Throttle stop screw
63