439074 Aftermarket Mercruiser Carburettor Kit | Sawley's Select Marine Parts

🔧 Product Description

Aftermarket Johnson/Evinrude carburettor kit with float - Replacement Part Number: 439074

A carburettor repair kit with float for early Johnson and Evinrude Big Twin and related two-stroke outboards. Despite the supplied MerCruiser wording, 439074 is an OMC/BRP outboard reference. It services one carburettor and replaces several earlier OMC kit numbers.

⚙️ Key Features

• Complete kit with float for one OMC carburettor

• Suitable for selected 28HP-40HP early Big Twin engines

• Cross-references to Sierra and later BRP service packaging

• Renews inlet-valve, float and gasket components

• Not a MerCruiser sterndrive kit

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 439074 → Consolidates 382050, 382051 and 382054

• 777726 is a later/related BRP service number

OEM / Related Numbers:

• 0439074

• 439074

• 382050

• 382051

• 382054

• 431897

• 438397

• 777726

Aftermarket / Verified Equivalents:

• Sierra: 18-7010

• GLM: 40530

• Recmar: REC439074

• Quicksilver/Mercury: 8M6010307

Included Components:

• Float assembly - Component service reference: supplied in Kit 439074

• Float hinge pin - Component service reference: supplied in Kit 439074

• Needle-and-seat assembly - Component service reference: supplied in Kit 439074

• Float-bowl gasket - Component service reference: supplied in Kit 439074

• Carburettor body and mounting gaskets - Component service reference: supplied in Kit 439074

• O-rings, seals, washers and core plugs - Component service reference: supplied in Kit 439074

🚤 Compatibility

Commonly used on:

• Johnson and Evinrude early Big Twin and related carburetted two-stroke outboards

Typically suits:

• Engine models:

• 28HP and 30HP Big Twin applications

• 33HP approximately 1965-1970

• 35HP early applications including 1959

• 40HP manual-start and electric-start applications from the 1960s

• HP Range: Approximately 28HP - 40HP

• Engine Type: Carburetted two-stroke outboard

• Year Range: Approximately 1959 - 1971

• Quantity Required: One kit per carburettor

🔌 Function

The kit restores the float, needle-and-seat and sealing components that control fuel entry and prevent leakage in early OMC carburettors.

Common signs of failure:

• Hard starting or excessive choke/enrichment required

• Rough idle, hunting or repeated low-speed stalling

• Hesitation, flat spots or intake backfire during acceleration

• Fuel leakage, flooding or an incorrect float-bowl level

• Lean surging, reduced power or fuel starvation under load

• Rich running, smoke, spark-plug fouling or excessive fuel consumption

📦 Condition

• Brand new aftermarket replacement part

• New and unused

• Supplied in manufacturer or equivalent protective packaging