2006-2008 Yamaha Snowmobiles Apex/Attak Factory Service Manual, Page 81Get this manual

2006-2008 Yamaha Snowmobiles Apex/Attak Factory Service Manual, Page 81

HIGH ALTITUDE TUNING INSP ADJ HIGH ALTITUDE TUNING To attain the best performance in high altitude conditions, carefully
OK Adjust the engine idle speed by turning the stop screw of carburetorCheck to see if the gearing is too high or low OK
Try high altitude settings Adjust the engine idle speed by turning the stop screw of carburetor Decide if the problem is
with the pilot jet and adjust accordingly Not OK OK Check the engagement speed and shift performance Not OK OK High altitude