Products Description
MS660 Chainsaw Carburetor
Precision Fuel System Component for STIHL 066 & MS660 Professional Saws
The MS660 carburetor is a critical fuel delivery component for the STIHL 066 and MS660 chainsaws, designed to precisely meter the air-fuel mixture for the saw's powerful 91cc engine. Available in multiple OEM and aftermarket configurations, the correct carburetor ensures reliable starting, smooth idling, and consistent power delivery under demanding cutting conditions. Options range from genuine Walbro and Tillotson units to quality aftermarket alternatives, with rebuilt carburetors available for professional overhaul work . Proper installation and adjustment of this component is essential for maintaining optimal engine performance and preventing damage from lean running conditions .
Technical Profiles & Materials
Multiple OEM & Aftermarket Options – Available as genuine Walbro WJ-series (WJ-67, WJ-67A, WJ-76A), Tillotson HS-320A, and Zama C3A-S31 carburetors . Quality aftermarket alternatives provide cost-effective solutions for routine maintenance and repair .
Precision Fuel Metering – The diaphragm carburetor design ensures accurate air-fuel mixture delivery across the full RPM range. Walbro WJ-series carburetors are known for reliable performance in professional applications, with adjustable high and low-speed jets allowing fine-tuning for various operating conditions .
OEM-Spec Replacement Compatibility – Replaces STIHL OEM part numbers 1122 120 0621 and 1122 120 0623 . Compatible with Walbro WJ-67A, WJ-76A, and Zama C3A-S31 carburetor specifications .
Technical Specifications
| # | Parameter | Specification |
|---|---|---|
| 1 | OEM Part No. | 1122 120 0621 / 1122 120 0623 |
| 2 | Compatible Models | STIHL 064, 066, MS650, MS660, MS660 Magnum |
| 3 | OEM Carburetor Types | Walbro WJ-67, WJ-67A, WJ-76A, Tillotson HS-320A, Zama C3A-S31 |
| 4 | Also Fits | 065, MS640, Holzfforma G660 |
| 5 | Material | High-hardness Aluminum Alloy |
| 6 | Weight (Typical) | 170g – 176g |
| 7 | Engine Type | 2-Stroke Gasoline |
| 8 | Carburetor Type | Diaphragm-type (position-insensitive) |
Products Application
Complete Carburetor Replacement
Direct replacement for worn, damaged, or corroded carburetors on STIHL 064/066/MS660 platforms. Users report aftermarket units perform "as good or better" than OEM at a significantly lower price point . Pre-adjusted carbs minimize setup time for workshop installations.
Professional Engine Tune-Up & Performance Restoration
The MS660 carburetor is a primary candidate for replacement during engine overhauls and performance restoration. The standard factory setting is designed to provide an optimum fuel-air mixture under most operating conditions .
Carburetor Rebuild & Overhaul
For saws experiencing hard starting, erratic idling, or poor power delivery, comprehensive rebuild kits such as the Walbro K15-WJ provide all necessary gaskets, diaphragms, and internal components to restore the existing carburetor to full working order .
Quality and Craftsmanship Details
Products Package
About Us
As a premier garden machinery parts supplier, Jiaxing Norsun Trading Co., Ltd. bridges global distributors with over 100 vetted China manufacturers. We streamline your B2B supply chain through strict quality control, flexible production, and factory-direct wholesale pricing. Partner with us for reliable, high-volume sourcing of precision-engineered outdoor power equipment components.
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FAQ
Q: How do I confirm which carburetor fits my MS660?
A:Check your chainsaw model number and existing carburetor type. The MS660 uses Walbro WJ-series, Tillotson HS-320A, or Zama C3A-S31 carburetors . OEM references include 1122 120 0621 and 1122 120 0623 . Match your replacement carburetor to the one being replaced .
Q: What is the standard carburetor adjustment setting for the MS660?
A: STIHL MS660 carburetors have two standard settings: some models use H = 1 and L = 1 turns from seated, while others use H = 3/4 and L = 1/4 turns . The high speed screw alters engine power output and maximum off-load engine speed. If the setting is too lean, there is a risk of engine damage due to insufficient lubrication and overheating .
Q: What is the difference between OEM and aftermarket carburetor options?
A: Genuine OEM carburetors (Walbro, Tillotson) offer factory-spec reliability and are recommended for professional use . Quality aftermarket alternatives provide cost-effective solutions for routine maintenance and are available from ISO-certified manufacturers .
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