Port Side Standard Bore Piston Kit with Rings Compatible with 2003-2012 Mercury Mariner V6 2.5L OptiMax 135HP-200HP Outboard Motor 3.501 Bore 785-9737T11 854686A11 326764

Port Side Piston Kit Standard Compatible with 2003-2012 Mercury Mariner 135HP-200HP V6 2.5L OptiMax 3.501" Bore
Direct replacement standard size port side piston kit for 2003 through 2012 Mercury and Mariner V6 2.5L OptiMax direct fuel injection 2-stroke outboard motors with 3.501" standard bore. Kit includes cast aluminum piston machined to 3.501" bore, 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:
• 785-854686A11
• 785-841088T1
• 785-854686A7
• 785-9737T11
• 854686A11
• 854686A7
• 326764 (wrist pin)
• 326765 (circlip retainers)

SPECIFICATIONS:
• Type: Port Side Piston Kit with Rings
• Size: Standard
• Bore: 3.501" Standard
• Engine: V6 2.5L OptiMax DFI 2-Stroke
• Horsepower: 135HP-200HP
• Side: Port (Left)
• Kit Contents: Piston, Ring Set, Wrist Pin, Circlip Retainers
• Material: Cast Aluminum

APPLICATIONS:
• 135HP V6 2.5L OptiMax (2003-2012)
• 150HP V6 2.5L OptiMax (2003-2012)
• 175HP V6 2.5L OptiMax (2003-2012)
• 200HP V6 2.5L OptiMax (2003-2012)

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.