12
Spark Plug
This snowmobile comes equipped with a
specified spark plug. See the specifications
chart for the correct spark plug. A light
brown insulator indicates that the plug is
correct. A white or dark insulator indicates
that the engine may need to be serviced.
Consult an authorized Yamaha Snowmo-
bile dealer if the plug insulator is not a light
brown color. To help prevent cold weather
fouling, make sure to thoroughly warm up
the engine before operating.
To maintain a hot, strong spark, keep the
plug free of carbon.
Before removing the spark plug, be sure
to clean the area around the spark plug. If
you do not, dirt could enter engine when
removing or installing the spark plug.
Adjust the gap to specified amount (see
specifications chart) for proper ignition.
Use a feeler gauge to check the gap.
ATV0052B
When installing the spark plug, be sure to
tighten it securely. A new spark plug
should be tightened 1/2 turn once the
washer contacts the cylinder head. A
used spark plug should be tightened 1/8 -
1/4 turn once the washer contacts the cyl-
inder head.
Checking/Adjusting
Throttle Lever (Tension)
NOTE: Assure that the throttle
cable is properly seated in the throt-
tle control housing.
1. Verify when releasing the throttle
lever that the round switch in the
control housing is compressed. If the
switch is not compressed the engine
will shut down when the throttle
lever is released.
ZR-089A
ZR-091
2. If the throttle cable needs to be
adjusted, locate the throttle cable in-
line adjuster next to the steering
post; then adjust the in-line adjuster
until the governor arm (A) starts to
move.
ZR-090A
3. Tighten nut against the in-line
adjuster and cover the adjuster with
rubber boot.
! WARNING
The throttle lever is intended to stop
on handlebar before or at the same
time as carburetor valve is at wide
open throttle (WOT) position. Damage
may occur if throttle lever is adjusted
that it does not contact handle bar.
