2-49
INSP
ADJ
HIGH ALTITUDE TUNING
Adjust the size of the main jet
Re-test
Try high-altitude settings
Decide if the problem is with the
pilot jet and adjust accordingly
Adjust the main jet size according to the
chart
Not OK
Check the engagement speed
and shift performance
Adjust the primary clutch as
required
Adjust the secondary clutch as re-
quired
High altitude
tuning OK
OK
Check to see if the gearing is too high or low
OK Not OK
Not OK
Not OK
OK
Not OK
Not OK
OK
Check STD settings
• Carburetors
• Spark plugs
HIGH ALTITUDE TUNING
To attain the best performance in high altitude conditions, carefully tune the snowmobile as outlined
below.
Test the main jet
(performance & plug color)
OKNot OK
OK
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▼
▼
Test the low-speed setting
▼
▼
▼
OK
▼
▼
▼
▼
▼
OK
▼
▼
OK
▼
▼
▼
Not OK
▼
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