Periodic maintenance and adjustment
68
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.
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.
ESU11795
Adjusting the engine idling
speed (RST90)
1. Place the snowmobile on a level surface
and apply the parking brake.
2. Start the engine and warm it up.
Refer to the “Starting the engine” section on
page 47.
3. Open the shroud.
4. Turn the throttle stop screw in or out to
adjust the engine idling speed.
5. Close the shroud.
ESU14071
Adjusting the throttle lever free
play
RS90P / RS90PLT
1. Place the snowmobile on a level surface
and apply the parking brake.
2. Remove the shroud, the left and right
side covers, and the top cover. (See page
62 for removal procedures.)
3. Remove the headlight unit bolt on each
side of the snowmobile.
4. Unhook the headlight unit as shown, then
lift it up and move it forward, away from
the handlebar. NOTICE: Be careful not
to scratch the snowmobile when mov-
ing the headlight unit.
[ECS00920]
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
1. Headlight unit bolt
1. Headlight unit
U8HV11E0.book Page 68 Monday, April 23, 2012 9:34 AM
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