2012 Yamaha Motorsports RS Viking Professional Owners Manual - Page 49

2012 Yamaha Motorsports RS Viking Professional Manual

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Periodic maintenance and adjustment 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, carbon will form on the exposed threads resulting 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) ECS00382 NOTICE Make sure that the spark plug caps are securely installed. Otherwise the spark plug caps could be damaged due to engine vibration. ESU11794 Adjusting the engine idling speed 1. 2. Place the snowmobile on a level surface and apply the parking brake. Start the engine and warm it up. TIP Refer to the "Starting the engine" section on page 29. 3. 4. Open the shroud. Turn the throttle stop screw in or out to adjust the engine idling speed. 1. Spark plug gap 2. Spark plug reach Before installing any spark plug, measure the electrode gap with a wire thickness gauge and adjust to specification. 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 Nm (1.3 m·kgf, 9.4 ft·lbf) 1. Throttle stop screw Standard engine idling speed: 1300-1500 r/min 5. Close the shroud. ESU11822 Adjusting the throttle cable free play ECS00410 NOTICE Be sure to adjust the engine idling speed first. 43

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Periodic maintenance and adjustment
43
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.
NOTICE
ECS00382
Make sure that the spark plug caps are se-
curely installed. Otherwise the spark plug
caps could be damaged due to engine vi-
bration.
ESU11794
Adjusting the engine idling
speed
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 29.
3.
Open the shroud.
4.
Turn the throttle stop screw in or out to
adjust the engine idling speed.
5.
Close the shroud.
ESU11822
Adjusting the throttle cable free
play
NOTICE
ECS00410
Be sure to adjust the engine idling speed
first.
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:
13 Nm (1.3 m·kgf, 9.4 ft·lbf)
1.
Throttle stop screw
Standard engine idling speed:
1300–1500 r/min