OEM Grade Starboard Piston Kit .010 Oversize Compatible with 2003-2012 Mercury Mariner 135HP 150HP 175HP 200HP V6 2.5L OptiMax Outboard 3.511 Bore 39-841089T1 785-854687A11

Starboard Side Piston Kit .010 Oversize Compatible with 2003-2012 Mercury Mariner 135HP-200HP V6 2.5L OptiMax 3.511" Bore
Direct replacement .010 oversize starboard 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 3.511" bore (.010 oversize over 3.501" standard), piston ring set, wrist pin, and circlip retainers for a complete single-cylinder rebuild. Starboard side only — order matching port piston kit separately.

OEM CROSS-REFERENCE PART NUMBERS:
• 39-841089T1 (standard reference)
• 785-854687A11
• 785-854687A7
• 785-9738T11
• 326764 (wrist pin)
• 326765 (circlip retainers)

SPECIFICATIONS:
• Type: Starboard Side Piston Kit with Rings
• Size: .010 Oversize
• Bore: 3.511" (.010 oversize over 3.501" standard)
• Engine: V6 2.5L OptiMax DFI 2-Stroke
• Horsepower: 135HP-200HP
• Side: Starboard (Right)
• 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 STARBOARD side piston only — order matching port piston separately
• Kit is for ONE cylinder — V6: order 3 port + 3 starboard pistons

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