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Please check these areas before asking.....
http://www.totallyamaha.com/snowmobiles/aaTECH/tuning page.htm
http://www.totallyamaha.com/snowmobiles/AAATuning Chart/Tuning_Chart.htm
http://www.totallyamaha.com/snowmobiles/aaTECH/tuning page.htm
http://www.totallyamaha.com/snowmobiles/AAATuning Chart/Tuning_Chart.htm