High Altitude Tuning - Yamaha RX10K Supplementary Service Manual

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)
OK
Test the low speed setting
Not OK
Try high altitude settings
Not OK
Decide if the problem is with the pilot jet
and adjust accordingly
Not OK
HIGH ALTITUDE TUNING
Not OK
OK
Adjust the
engine idle
speed by
turning the
stop screw of
carburetor.
Adjust the engine
idle speed by
turning the stop
screw of carburetor.
OK
OK
Not OK
2-67
Check STD settings
S Carburetors
S Spark plugs
Adjust the main jet size according to the
chart
Adjust the size of the main jet
Re-test
OK Not OK
Check to see if the gearing is too high or low
OK
Check the engagement speed and shift
performance
Not OK
OK
Adjust the primary clutch as required
Not OK
Adjust the secondary clutch as required
INSP
ADJ
High altitude
tuning OK
OK
OK