2004-2007 Honda Aquatrax ARX1200N3/T3/T3D Factory Service Manual, Page 294Get this manual

ENGINE REMOVALINSTALLATION CONCENTRIC ALIGNMENT Make sure that the side surfaces of the coupler blade are flush with the attachment side surfaceIf they are not flush, adjust the engine position using the shim(s) or by sliding the engine so the alignment is within 0.5 mm
Incorrect:

Correct:

DRIVE COUPLER

Within 0.5 mm

COUPLER ATTACHMENT

• ATV
• Jet Ski
• Outboard Motors
• Personal Watercraft
• Snowmobiles
• Stern Drives