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

🚤 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

🔄 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

📦 Condition

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