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Periodic maintenance and adjustment
45
Left and right side covers
To remove a side cover
1. Remove the shroud. (See above for re-
moval procedures.)
2. Loosen the fasteners, and then remove
the side cover as shown.
To install a side cover
1. Insert the projection on the rear of the
side cover into the slot in the fuel tank
side cover and insert the projections on
the front of the side cover into the slots in
the lower cover.
2. Tighten the fasteners.
3. Install the shroud.
NOTICE
ECS00371
● Make sure that all cables, leads, etc., are
routed properly before installing the
shroud and covers.
● When installing the shroud and covers,
be sure to tighten the fasteners secure-
ly.
ESU11782
Checking the spark plugs
The spark plug is an important engine compo-
nent and is easy to inspect. The condition of
the spark plug can indicate the condition of
the engine.
Check the coloration on the white porcelain
insulator around the center electrode. The
ideal coloration at this point is a medium to a
light tan color for a snowmobile that is being
ridden normally. If a spark plug shows a dis-
tinctly different color, there could be some-
thing wrong with the engine. For example, a
very white center electrode porcelain color
could indicate an intake track air leak or car-
buretion problem for that cylinder. Do not at-
tempt to diagnose such problems yourself.
Instead, take the snowmobile to a Yamaha
dealer for inspection and possible repairs.
You should periodically remove and inspect
the spark plug because heat and deposits will
cause a spark plug to slowly break down and
erode. Consult a Yamaha dealer before
changing to a different type of spark plug.
WARNING
EWS00710
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
1. Left side cover
2. Fastener
1. Left side cover
2
1
2
2
1
Specified spark plug:
Manufacturer:
NGK
Model:
CR9E
U8HK10E0.book Page 45 Tuesday, June 10, 2008 1:58 PM