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Periodic maintenance
44
2. Loosen the fasteners, and then remove
the side cover.
To install a side cover
1. Place the side cover in the original posi-
tion, and then tighten the fasteners.
NOTE:
Be sure to insert the projection on the rear of
the side cover into the hole in the fuel tank
side cover and insert the projections on the
front of the cover into the slots in the lower
cover.
2. Install the shroud.
WARNING
EWS00090
● Do not drive the snowmobile with the
shroud or covers unfastened or re-
moved.
● Keep your body and clothing away from
rotating parts when servicing the snow-
mobile with the shroud or covers re-
moved.
● Do not touch the hot muffler and engine
during or immediately after operation.
CAUTION:
ECS00370
Make sure that all cables, leads, etc., are
routed properly before installing the
shroud and covers.
NOTE:
When installing the shroud and covers, be
sure to tighten the fasteners securely.
ESU11780
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.
1. Right side cover
2. Fastener
1. Left side cover
2. Fastener
U8GL10E0.book Page 44 Friday, May 18, 2007 3:17 PM