Port Side .040 Over Piston Kit with Rings Compatible with 2000-2012 Mercury Mariner V6 DFI OptiMax 200HP-250HP Outboard Motor Sport Boat 3.665 Bore 785-9737A10 785-9737A8 326764

Port Side Piston Kit .040 Oversize Compatible with 2000-2012 Mercury Mariner Sea-Doo 200HP-250HP V6 DFI OptiMax 3.665" Bore
Direct replacement .040 oversize port side piston kit for 2000 through 2012 Mercury, Mariner, and Sea-Doo V6 DFI OptiMax direct fuel injection 2-stroke outboard motors and sport boats with 3.625" standard bore. Kit includes cast aluminum piston machined to 3.665" bore (.040 oversize over 3.625" standard), piston ring set, wrist pin, and circlip retainers for a complete single-cylinder rebuild. Port side only — order matching starboard piston kit separately.

OEM CROSS-REFERENCE PART NUMBERS:
• 785-9737A10 (oversize piston reference)
• 785-9737A8
• 326764 (wrist pin)
• 326765 (circlip retainers)

SPECIFICATIONS:
• Type: Port Side Piston Kit with Rings
• Size: .040 Oversize
• Bore: 3.665" (.040 oversize over 3.625" standard)
• Engine: V6 DFI OptiMax Direct Fuel Injection 2-Stroke
• Horsepower: 200HP-250HP
• Side: Port (Left)
• Kit Contents: Piston, Ring Set, Wrist Pin, Circlip Retainers
• Material: Cast Aluminum

APPLICATIONS:
• 200HP V6 DFI OptiMax (2000-2012)
• 225HP V6 DFI OptiMax (2000-2012)
• 250HP V6 DFI OptiMax (2000-2012)
• Sea-Doo Sport Boats with Mercury V6 DFI OptiMax

NOTES:
• This is the PORT side piston only — order matching starboard piston separately
• Kit is for ONE cylinder — V6: order 3 port + 3 starboard pistons

⚠️ Verify OEM part number from your original engine before ordering.