1990-1998 Arctic Cat Snowmobiles Repair Manual, Page 231Get this manual
FUEL SYSTEM-CARBURETED MODELS
torThe altitude compensator contains springloaded bellows and piston that adjust air pressure in the carburetor float chamber according to altitude and air densityAt low altitude, the compensator permits full atmospheric pressure to enter the float chamberAt high altitude, the compensator limits air pressure to the float chamber thereby leaning the air mixtureThe
compensator must be serviced as unit assemblyCAUTION Do not turn the adjustment screw on the compensatorImproper adjustment may damage the engineEngine damage due to the improper adjustment of the compensator will void the engine warranty
A heated elbow is located on the PTa-side carburetorThe heated elbow prevents icing in the hoseShould the heater fail and the hose become plugged by ice, the fuel mixture will be excessively rich at high altitudeRefer to Figures 32 and 33 for hose routingNote that the hose wraps around the carburetorThere must be no kinks or sharp bends in the hoseNOTE Hose length is critical for proper operationA replacement hose must be the same length as the original hose