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

🚤 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

• 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

🔄 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

📦 Condition

• Genuine Yamaha part
• Brand new
• Supplied in original or equivalent packaging