# 63P-43861-20 Yamaha O-Ring | Genuine OEM Yamaha Outboard Part

🔧 Product Description

  

Genuine Yamaha Trim Cylinder End Screw O-Ring - Part Number: 63P-43861-20-00

  

A genuine Yamaha OEM O-ring used in Yamaha power trim and tilt assemblies. This O-ring seals the trim cylinder end screw / trim piston cap area and helps prevent hydraulic fluid leakage from the power trim system.

  

⚙️ Key Features

  

• Genuine Yamaha OEM O-ring

• Correct Yamaha part number 63P-43861-20-00

• Trim cylinder end screw / trim piston cap O-ring

• Used in Yamaha power trim and tilt assemblies

• Helps maintain hydraulic sealing pressure inside the trim system

  

🔄 Supersession & Cross Reference

  

OEM Supersession Chain:

  

• 63P-43861-20-00 Yamaha trim cylinder end screw O-ring reference

• 63P-43861-20 short Yamaha O-ring format

• 6H1-43861-00-00 related Yamaha trim O-ring reference listed in aftermarket trim parts data

  

OEM / Related Numbers:

  

• 63P-43861-20-00

• 63P-43861-20

• 63P438612000

• 63P4386120

• 6H1-43861-00-00

• 6H1-43861-00

• 6H1438610000

• 6H14386100

• 6H1-43872-00 related backup ring

• 61A-4389H-01 related trim O-ring

• 63P-43811-20 related cylinder end screw

  

Aftermarket / Verified Equivalents:

  

• Included in aftermarket Yamaha trim / tilt seal kit families for 63P power trim assemblies

• Five Star Marine: FSM026 seal kit family for Yamaha 115HP-250HP / 115HP-225HP Showa-style trim units

• Aftermarket trim / tilt seal kit reference: 63P-43800-00-4D / 64E-43822 kit family

• Aftermarket replacement O-ring should be matched by OEM number 63P-43861-20-00 or 6H1-43861-00-00 where specified

• Trim cylinder cap seal-kit replacement family for Yamaha 150HP-350HP power trim assemblies

  

🚤 Compatibility

  

Commonly used on:

  

• Yamaha power trim and tilt assemblies

• Yamaha trim cylinder end screw / trim piston cap sealing locations

• Yamaha 63P and related Showa-style trim systems

  

Typically suits:

  

• Engine models:

• Yamaha 150HP power trim and tilt applications where 63P-43861-20 is specified

• Yamaha 175HP power trim and tilt applications where specified

• Yamaha 200HP power trim and tilt applications where specified

• Yamaha 225HP power trim and tilt applications where specified

• Yamaha 250HP power trim and tilt applications where specified

• Yamaha 300HP power trim and tilt applications where specified

• Yamaha 350HP power trim and tilt applications where specified

• Yamaha F175 / F200 / F225 / F250 / F300 / F350 trim cylinder assemblies using the 63P trim O-ring family

• Selected Yamaha 60HP / 70HP / 90HP / B90 / C55 / C60 / C75 / C80 / C85 trim applications where the diagram lists this O-ring

  

• HP Range: commonly 150HP - 350HP, with selected smaller trim assemblies where specified

• Engine Type: Yamaha outboard power trim and tilt system

• Year Range: model-specific, including many 2010s-2020s Yamaha trim assemblies

• Component Type: Hydraulic trim O-ring

  

🔌 Function

  

The O-ring seals the trim cylinder end screw area to help retain hydraulic pressure and prevent trim fluid leakage.

  

Common signs of failure or service need:

  

• Trim fluid leaking around cylinder cap

• Trim system slowly drops under load

• Air entering trim hydraulic system

• Low trim fluid level

• O-ring flattened, cut or hardened during service

• Trim cylinder cap removed for seal replacement

• Corrosion or seal damage around trim piston cap

  

📦 Condition

  

• Genuine Yamaha part

• Brand new

• Supplied in original or equivalent packaging

## Details

- **Price:** 4.49 AUD
- **Vendor:** Yamaha
- **Tags:** Yamaha Marine Parts | Outboard Engine Parts & Components

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 4.49 AUD | In stock |

## Images

- 63P-43861-20 Yamaha O-Ring | Genuine OEM Yamaha Outboard Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/63p-43861-20-00-o-ring)
> Updated: 2026-07-11