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 to fit Stihl MS640, MS650, and MS660 models. Built from durable metal with exact OEM-matching dimensions, this carburetor ensures reliable fuel delivery, smooth throttle response, and consistent power output — whether you're tackling heavy timber or routine yard work.

Key Features

• Direct Fit for MS640 / MS650 / MS660: Engineered for seamless, drop-in installation with no modifications required.
• Replaces WJ-67A & C3A-S31: A true OEM-spec replacement for straightforward swapping and immediate results.
• Reliable Fuel Delivery: Precision-machined channels and jets maintain optimal fuel-to-air mixture for consistent, powerful output.
• Lightweight Metal Construction: Weighs only 147 g — sturdy enough for demanding environments without adding unnecessary bulk to your equipment.
• Long-Lasting Durability: Built to withstand tough outdoor conditions, high vibration, and prolonged operation cycles.
• Easy Installation: Matches original mounting points and fuel line connections for a quick, tool-compatible swap.

Specifications

Package Contents

• 1 × Replacement Carburetor (WJ-67A / C3A-S31 compatible)

Important Notes

• Product color may appear slightly different from images due to monitor brightness and lighting conditions.
• Please allow slight measurement tolerances for listed dimensions.
• Verify your exact chainsaw model number before ordering to ensure compatibility.

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Frequently Asked Questions

Q: Which chainsaw models is this carburetor compatible with?

A: This replacement carburetor is designed to fit Stihl MS640, MS650, and MS660 chainsaws. It directly replaces OEM part numbers WJ-67A and C3A-S31. Always double-check your saw's model and serial number before installing.

Q: Is any special tool required to install this carburetor?

A: No special tools are required beyond standard chainsaw maintenance tools. The carburetor matches original mounting points and fuel line connections exactly, making installation straightforward for anyone comfortable with basic engine servicing.

Q: Is this an OEM part or an aftermarket replacement?

A: This is a high-quality aftermarket replacement part engineered to OEM specifications. It is designed to deliver the same reliable fuel delivery and performance as the original, at a more accessible price point.

Q: What is the carburetor made of?

A: The carburetor is constructed from durable metal, built to withstand the high-vibration, high-temperature demands of professional chainsaw use in tough outdoor environments.