1990-1998 Arctic Cat Snowmobiles Repair Manual, Page 138Get this manual
128 aTurn both mixture screws clockwise slightly to see if the engine's speed increasesb
CHAPTER FOUR
If the speed increases, continue turning
both screws until the speed begins to slow, then tum the screws (B, Figure 2) counterclockwise until the engine is idling smoothly at the highest engine speed
cIf the speed does not increase, tum the screws back to their original settings and continue to Step 99When the pilot air screws are set to provide the optimum mixture at idle speed, operate the snowmobile and check performance10If performance is off at high altitudes or in extremely cold temperature, it may be necessary to install larger pilot jetsRefer to Chapter Six for carburetor removal and disassembly11If the off-idle pickup is poor, richen the idle mixture slightly by turning the pilot air screws clockwise slightly, then repeat Step 9If off-idle pickup is poor after readjusting the pilot air screws, it may be necessary to install smaller pilot jetsAfter replacing the pilot jets, repeat Steps 2-9