# 6G5-43864-09 Yamaha Seal | Genuine OEM Yamaha Outboard Part

🔧 Product Description

  

Genuine Yamaha Power Trim Auxiliary Cylinder O-Ring - Part Number: 6G5-43864-09

  

A genuine Yamaha hydraulic O-ring used in selected Showa power-trim and tilt assemblies.

  

The approximately 35.7mm x 3.5mm O-ring seals one of the auxiliary trim-cylinder joints, retaining hydraulic fluid while preventing water and contamination from entering the cylinder.

  

⚙️ Key Features

  

• Genuine Yamaha OEM hydraulic trim O-ring

• Correct current Yamaha part number 6G5-43864-09

• Supersedes earlier O-ring 6G5-43864-00

• Approximate dimensions: 35.7mm x 3.5mm

• Recmar, Honda and aftermarket replacements available

  

🔄 Supersession & Cross Reference

  

OEM Supersession Chain:

  

• 6G5-43864-09 → Supersedes 6G5-43864-00

• 6G5-43864-00 earlier OEM power-trim O-ring reference

  

OEM / Related Numbers:

  

• 6G5-43864-09

• 6G5-43864-09-00

• 6G5-43864-00

• 6G5-43864-00-00

• Honda Marine: 91354-ZW1-701

• Size: approximately 35.7mm x 3.5mm

  

Aftermarket / Verified Equivalents:

  

• Recmar: REC6G5-43864-00

• Honda Marine: 91354-ZW1-701

• MIAOSENXIN: 6G5-43864-09 replacement O-ring

• Aftermarket Showa trim-cylinder O-ring: 35.7mm x 3.5mm

  

🚤 Compatibility

  

Commonly used on:

  

• Yamaha Showa power-trim and tilt auxiliary cylinders

• Twin-trim-ram hydraulic assemblies

  

Typically suits:

  

• Engine models:

• Yamaha 115HP two-stroke and four-stroke trim assemblies

• Yamaha 130HP two-stroke

• Yamaha 150HP two-stroke and four-stroke

• Yamaha 175HP two-stroke and four-stroke

• Yamaha 200HP two-stroke and four-stroke

• Yamaha 225HP two-stroke and four-stroke

• Yamaha 250HP 20-inch-shaft applications using the Showa trim unit

• Yamaha Z150, Z175, Z200, Z225 and Z250 HPDI trim systems

• Yamaha F115, F150, F200, F225 and F250 trim assemblies where specified

• Yamaha 150 / 175 / 200 trim systems from late-1980s production onward

  

• HP Range: Approximately 115HP - 250HP

• Engine Type: Yamaha two-stroke, HPDI and four-stroke outboard

• Year Range: Approximately 1989 onward, dependent on trim-unit manufacturer and cylinder design

  

🔌 Function

  

The O-ring seals the trim-cylinder joint so hydraulic pressure can move and hold the outboard without fluid leakage.

  

Common signs of failure:

  

• Hydraulic oil leaks around the trim cylinder

• Outboard slowly settles after being trimmed

• Trim system requires frequent fluid top-ups

• Water contamination enters the hydraulic fluid

• O-ring is flattened, cut or hardened

  

📦 Condition

  

• Genuine Yamaha part

• Brand new

• Supplied in original or equivalent packaging

## Details

- **Price:** 9.3 AUD
- **Vendor:** Yamaha
- **Tags:** Yamaha Marine Parts | Outboard Engine Parts & Components

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 9.30 AUD | In stock |

## Images

- 6G5-43864-09 Yamaha Seal | Genuine OEM Yamaha Outboard Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/6g5-43864-09-seal)
> Updated: 2026-07-11