2009-2010 Ski-Doo REV-XP/XR 2 Stroke and REV-XR 1200 4-TEC Service Manual, Page 111Get this manual
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Section 02 ENGINE Subsection 09 (MAGNETO SYSTEM)
7 Remove magneto flywheel retaining nut, using 30 mm socket with the outside diameter machined to 40 mm (1.580 in) by 16 mm (58 in) long8