YAMAHA/MARINER POWERHEAD GASKET KIT 75HP, 85HP & 90HP 688-W0001-00

Powerhead Gasket Kit (688-W0001-00)

A complete powerhead gasket set designed for 3-cylinder 2-stroke Yamaha (75HP–90HP) and Japanese-built Mariner outboards (1984–2006+). Essential for restoring engine compression, sealing the cylinder block, and completing full powerhead overhauls or head gasket replacements.

Yamaha OEM Part Cross-Reference & Supersessions

This kit directly replaces, supersedes, or interchanges with the following Yamaha part numbers:

688 Series:

• 688-W0001-00 / 688-W0001-00-00 (Base Part)

• 688-W0001-01 / 688-W0001-01-00

• 688-W0001-02 / 688-W0001-02-00

• 688-W0001-A0 / 688-W0001-A0-00

• 688-W0001-A1 / 688-W0001-A1-00

• 688-W0001-A2 / 688-W0001-A2-00

6H1 / 6H2 Parallel Series:

• 6H1-W0001-00 / 6H1-W0001-00-00

• 6H1-W0001-A0 / 6H1-W0001-A0-00

• 6H2-W0001-00 / 6H2-W0001-00-00

Cross-Over Brand & Aftermarket Part Numbers

Engine Fitment & Model Compatibility

Yamaha Outboards (3-Cylinder, 2-Stroke Models):

• 75 HP: 75HP (1994 – 1999)

• 85 HP: 85HP (1989 – 1996)

• 90 HP: 90HP, 90TLR, 90TJR, C90 (1984 – 2006+)

Mariner Outboards (Yamaha-Built 2-Strokes):

Fits Mariner models built by Yamaha in Japan using serial prefixes 688, 6H1, and 6H2:

• Mariner 75 HP: 75HP 3-Cylinder (1989 – 1998)

• Mariner 90 HP: 90HP 3-Cylinder (1978 – 1998)

Kit Includes

• 1x Cylinder Head Gasket

• 1x Powerhead Base / Adapter Plate Gasket

• 1x Exhaust Cover Outer Gasket

• 1x Exhaust Cover Inner Gasket

• 1x Intake Manifold / Reed Plate Gasket Set

• 1x Thermostat Cover Gasket

• Complete Upper & Lower Crankshaft Oil Seals & Housing O-Rings