15
NOTE: If the recommended chain
lube or a dry, graphite-based chain
lubricant is not available, lubricate
the drive chain with several drops of
petroleum-based oil. If the snowmo-
bile is operated in the summer with
the optional wheel kit, the drive chain
should be lubricated more frequently.
Drive Chain Tensioner
The drive chain tensioner is automatic;
therefore, no adjustment is required by
the snowmobile owner. The tensioner
and chain should be checked annually for
proper operation and excessive wear and
replaced when necessary. Check the ten-
sioner by pushing down on it and releas-
ing it. It should immediately spring back
and put tension on the drive chain.
Rear Suspension
This procedure should be done every 20
operating hours.
1. Shut engine off and wait for all mov-
ing parts to stop.
2. With the gas tank nearly empty (less
than 1/4 full), lay the snowmobile on
its side. A piece of cardboard should
be used to protect the finish on the
hood and belly pan.
3. Remove ice and snow buildup from
the skid frame to expose the two
grease fittings.
4. Lubricate the grease fittings with an
all-temperature grease.
Track Tension
NOTE: Track tension and track
alignment are interrelated; there-
fore, always check both, even if only
one adjustment seems necessary.
Track tension is directly related to the
overall performance of the snowmobile.
If the track is too loose, it may slap
against the tunnel causing wear, or it may
ratchet on the track drive sprockets.
Yamaha recommends that the track ten-
sion be checked once a month and
adjusted accordingly.
Checking Track Tension
1. Remove excess ice and snow
buildup from the track, track drive
sprockets, and the inside of the skid
frame.
2. Place the rear of the snowmobile up
on a safety stand high enough so the
track is free of the floor.
3. Without exerting any pressure on the
track, measure the distance between
the bottom of the wear strip and the
inside surface of the track. The mea-
surement must be within specifica-
tions of 6.4-9.5 mm (1/4-3/8 in.). If
the measurement is not within speci-
fications, an adjustment is necessary.
0744-945
Adjusting Track Tension
1. Loosen the idler wheel cap screws.
2. Loosen the rear idler wheel adjust-
ing bolt jam nuts.
! WARNING
Track tension must be properly main-
tained. Personal injury could result if
a track is allowed to become exces-
sively loose.
! WARNING
DO NOT attempt to check or adjust
track tension with engine running.
Turn ignition key to the OFF position.
Personal injury could result from
contact with a rotating track.
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