2001 Arctic Cat Snowmobiles Factory Service Manual, Page 156Get this manual
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2001 Arctic Cat Engine Specifications
999 60.96 81 3.19 64.6 2.54
16 1.556 0.061 0.7-0.8 0.028-0.031
Engine Model Number AA12A1 AA37A3 AS44A4 AU50L5 AT50L5 CB55L