Chainsaw Carburetor MS640 MS650 MS660 – Replaces WJ-67A

Chainsaw Carburetor Replacement for MS640 / MS650 / MS660 – Replaces WJ-67A (C3A-S31)

Keep your chainsaw running at peak performance with this precision-engineered replacement carburetor. Designed as a direct-fit replacement for the MS640, MS650, and MS660 models, this metal carburetor ensures reliable fuel delivery, smooth throttle response, and consistent power output — exactly what you need to get the job done efficiently in demanding outdoor conditions.

Key Features

• Direct Replacement: Compatible with MS640, MS650, and MS660 chainsaws; replaces OEM part WJ-67A (C3A-S31) for seamless installation.
• Reliable Fuel Delivery: Precision-machined jets and internal channels ensure a consistent fuel-to-air mixture for smooth, dependable power output.
• Precision Engineering: Exact dimensions guarantee a perfect fit with no modification required, making installation straightforward for both professionals and DIYers.
• Lightweight Construction: Weighs only 147g, minimising added load on your equipment during extended use.
• Durable Metal Build: Constructed from quality metal components built to withstand tough working environments and prolonged operational cycles.
• Effortless Starting: Properly calibrated fuel mixture promotes quicker cold and warm starts, reducing engine flooding and rough idling.

Specifications

Package Contents

• 1 × Replacement Carburetor

Installation Notes

Before installing, ensure your chainsaw is completely off and the fuel system has been safely depressurised. Verify the part number against your existing carburetor to confirm compatibility. Slight colour variations from product images may occur due to monitor display settings. Minor measurement deviations (±1–2mm) may apply due to manual measurement methods.

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Frequently Asked Questions

Q: Is this carburetor compatible with the MS660 as well as the MS640 and MS650?

A: Yes. This replacement carburetor is compatible with the MS640, MS650, and MS660 chainsaw models and directly replaces OEM part numbers WJ-67A and C3A-S31. Always cross-check your existing part number before ordering to ensure a perfect fit.

Q: Do I need any special tools to install this carburetor?

A: In most cases, standard screwdrivers and a carburetor adjustment tool are sufficient. Because this is a direct-fit replacement with exact OEM dimensions, no modification or drilling is required. Consult your chainsaw's service manual for model-specific installation guidance.

Q: What material is this carburetor made from?

A: The carburetor is constructed from durable metal components, designed to handle the heat, vibration, and fuel exposure typical of professional chainsaw operation in demanding outdoor environments.