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

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

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HIGH ALTITUDE TUNING
Test the low speed setting 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 alt