Piston Kit .015 Over with Rings Compatible with 1987-2006 Mercury Mariner 30HP-50HP Inline 3-Cylinder 2-Stroke Outboard Motor 2.580 65.5mm Bore 774-8600A3 774-9137A9 326764

Piston Kit .015 Oversize Compatible with 1987-2006 Mercury Mariner 30HP-50HP 3-Cylinder 2-Stroke Outboard 2.580" (65.5mm) Bore
Direct replacement .015 oversize piston kit for 1987 through 2006 Mercury and Mariner 3-cylinder 2-stroke outboard motors with 2.565" (65.1mm) standard bore. Fits 30HP, 40HP, 45HP, and 50HP models. Kit includes cast aluminum piston machined to 2.580" (65.5mm) bore (.015 oversize over 2.565" standard), piston ring set, wrist pin, and circlip retainers for a complete single-cylinder rebuild. Symmetrical piston design fits all cylinders — order 3 kits for complete rebuild.

OEM CROSS-REFERENCE PART NUMBERS:
• 774-8600A3 (standard reference)
• 774-9137A9
• 326764 (wrist pin)
• 326765 (circlip retainers)

SPECIFICATIONS:
• Type: Piston Kit with Rings
• Size: .015 Oversize
• Bore: 2.580" (65.5mm) (.015 oversize over 2.565" standard)
• Engine: Inline 3-Cylinder 2-Stroke Loop Charge
• Horsepower: 30HP-50HP
• Piston Type: Symmetrical (fits all cylinders)
• Kit Contents: Piston, Ring Set, Wrist Pin, Circlip Retainers
• Material: Cast Aluminum

APPLICATIONS:
• 30HP 3-Cylinder 2-Stroke (1987-2006)
• 40HP 3-Cylinder 2-Stroke (1987-2006)
• 45HP 3-Cylinder 2-Stroke (1987-2006)
• 50HP 3-Cylinder 2-Stroke (1987-2006)

NOTES:
• Symmetrical piston — same piston fits all cylinders
• Order 3 kits for complete 3-cylinder engine rebuild

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