2006 Arctic Cat ATVs 400/400TBX/400TRV/500/500TBX/500TRV/650H1/650 V-Twin Service Manual, Page 171Get this manual
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NOTE: At this point, oil the camshaft bearings, cam lobes, and the three seating journals on the cylinderNOTE: Note the position of the alignment marks on the end of the camshaftThey must be parallel