2004-2007 Honda Aquatrax ARX1200N3/T3/T3D Factory Service Manual, Page 293Get this manual
ENGINE REMOVALINSTALLATION Install the stopper collar and tighten it by hand until it is fully seated to secure the alignment shaftBe sure the alignment shaft end is flush with the stopper collarCOLLAR
STOPPER COLLAR PARALLEL ALIGNMENT Measure the clearance between the drive coupler and coupler attachment at each coupler blade by inserting feeler gauge, and make sure the coupler is fully seated on the attachment evenly (the maximum reading of the clearance is within 0.2 mm)