# 64E-43843-10 Yamaha Valve Lock Screw | Genuine OEM Yamaha Outboard Part

🔧 Product Description

  

Genuine Yamaha Power Trim Valve Lock Screw - Part Number: 64E-43843-10

  

A genuine Yamaha valve lock screw used inside selected power trim and tilt hydraulic assemblies.

  

The screw retains and secures the applicable hydraulic control-valve component within the trim motor or valve-body assembly. Correct retention is necessary for controlled hydraulic-fluid routing during trim-up, trim-down and tilt operation.

  

⚙️ Key Features

  

• Genuine Yamaha OEM hydraulic valve lock screw

• Correct Yamaha part number 64E-43843-10

• Used within selected 115HP to 300HP trim and tilt systems

• Precision-threaded component for the hydraulic valve assembly

• Direct replacement for the corresponding original Yamaha screw

  

🔄 Supersession & Cross Reference

  

OEM Supersession Chain:

  

• 64E-43843-10 → Supersedes 64E-43843-00

• 64E-43843-00 earlier Yamaha valve lock screw reference

  

OEM / Related Numbers:

  

• 64E-43843-10

• 64E-43843-10-00

• 64E438431000

• 64E-43843-00

• 64E-43843-00-00

• 64E-43841-00 related trim valve component

• 64E-43842-00 related hydraulic spring or valve component

  

Aftermarket / Verified Equivalents:

  

• No aftermarket equivalent

  

🚤 Compatibility

  

Commonly used on:

  

• Yamaha two-stroke and four-stroke hydraulic power trim and tilt units

• Yamaha VMAX, OX66, HPDI and large four-stroke valve-body assemblies

  

Typically suits:

  

• Engine models:

• Yamaha C115, F115, LF115 and 115-series trim assemblies

• Yamaha 130HP and L130 trim assemblies

• Yamaha C150, F150, FL150, L150, LZ150, S150, SX150, V150, VX150, VZ150 and Z150

• Yamaha F175, V175, VZ175 and Z175

• Yamaha F200, FL200, LF200, L200, LZ200, SX200, V200, VX200, VZ200 and Z200

• Yamaha F225, LF225, V225, VX225, VZ225 and Z225

• Yamaha F250, LF250, VX250, VZ250 and Z250

• Yamaha VZ300 and Z300 trim and tilt assemblies

• Confirmed F115AET 2001 power trim and tilt assembly

• Confirmed VZ300BTLR 2007 power trim and tilt assembly

• Confirmed Z150QETO 2010 power trim and tilt assembly

  

• HP Range: 115HP - 300HP

• Engine Type: Yamaha two-stroke, OX66, HPDI and four-stroke outboard

• Year Range: Approximately 1997 - 2018, dependent on hydraulic unit design

  

🔌 Function

  

The lock screw secures the associated hydraulic valve in its calibrated position. This allows the trim and tilt unit to direct fluid correctly and hold the engine at the selected operating angle.

  

Common signs of failure:

  

• Hydraulic valve component becomes loose or displaced

• Trim unit will not hold the selected position

• Slow or inconsistent trim-up or trim-down movement

• Internal hydraulic bypass within the valve body

• Damaged threads discovered during trim-unit overhaul

  

📦 Condition

  

• Genuine Yamaha part

• Brand new

• Supplied in original or equivalent packaging

## Details

- **Price:** 2.5 AUD
- **Vendor:** Yamaha
- **Tags:** Yamaha Marine Parts | Outboard Engine Parts & Components

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 2.50 AUD | In stock |

## Images

- 64E-43843-10 Yamaha Valve Lock Screw | Genuine OEM Yamaha Outboard Part
- 64E-43843-10 Yamaha Valve Lock Screw | Genuine OEM Yamaha Outboard Part
- 64E-43843-10 Yamaha Valve Lock Screw | Genuine OEM Yamaha Outboard Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/64e-43843-10-screw-valve-lock)
> Updated: 2026-07-11