Products Description
Chain Saw Carburetor Repair Kit For MS170/MS180 – Zama RB‑77 Rebuild Kit
OEM-Spec Carburetor Rebuild Kit for STIHL 017, 018, MS170 & MS180
This Zama RB‑77 carburetor repair kit provides a complete rebuild solution for the C1Q‑S57 and C1Q‑S137 series carburetors found on STIHL MS170, MS180, 017, and 018 chainsaws . The kit includes all essential gaskets, diaphragms, metering components, and fuel inlet parts needed to restore proper fuel metering and engine performance . Rebuilding your existing carburetor with this kit is a cost‑effective alternative to purchasing a new carburetor, addressing common issues such as hard starting, erratic idling, flooding, and power loss under load.
Technical Profiles & Materials
Complete Rebuild Solution – The RB‑77 kit includes all necessary gaskets, metering and pump diaphragms, inlet needle, metering lever, spring, pin, welch plug, and fuel strainer . Every component required to fully overhaul your carburetor is included in a single package.
OEM‑Compatible Fitment – Designed specifically for Zama C1Q‑S57, C1Q‑S57A, C1Q‑S57B, C1Q‑S57C, C1Q‑S57D, C1Q‑S137, C1Q‑S137A, and C1Q‑S137B carburetor models . The gasket and diaphragm set cross‑references to Zama GND‑33 .
Cost‑Effective Maintenance – Rebuilding the existing carburetor with this kit is more economical than purchasing a complete new carburetor, while retaining the original housing that is already calibrated to your specific saw .
Technical Specifications
| # | Parameter | Specification |
|---|---|---|
| 1 | Zama Kit Reference | RB‑77 |
| 2 | Gasket & Diaphragm Kit | GND‑33 |
| 3 | Compatible Carburetor Models | C1Q‑S57, S57A, S57B, S57C, S57D, S137, S137A, S137B, S137C, S137E, C1Q‑S43, S43A, S43B, S43C, C1Q‑S152, S152A, S152B |
| 4 | Compatible Chainsaws | STIHL 017, 018, MS170, MS180, MS210, MS230, MS250 |
| 5 | Kit Contents | Metering diaphragm, pump diaphragm, gaskets, inlet needle, metering lever, spring, pin, welch plug, fuel strainer |
| 6 | Pump Diaphragm Material | Rubber (OEM) / Teflon (aftermarket premium) |
| 7 | Venturi Size (C1Q‑S57D) | 13.5 mm |
| 8 | OEM Availability | Must be purchased from an authorized STIHL dealer for genuine Zama parts |
Products Application
Hard Starting & No‑Start Conditions
If your MS170 or MS180 cranks but refuses to start unless primed excessively, the rubber diaphragms inside the carburetor have likely hardened from ethanol‑blended fuel exposure. The RB‑77 kit replaces these degraded components, restoring proper fuel delivery and vacuum sealing .
Erratic Idling & Surging Under Load
When the engine idles inconsistently or surges unpredictably, the metering diaphragm, needle, or spring has worn out. Replacing these components with the precision‑machined parts in the RB‑77 kit restores stable idle and smooth acceleration .
Flooding or Fuel Leakage
Fuel leakage around the carburetor base or primer bulb typically indicates a failed gasket set. The new gaskets and diaphragms in this kit eliminate leaks and prevent fuel from entering the combustion chamber uncontrollably.
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 if my carburetor uses the RB‑77 kit?
A:Check the carburetor model number stamped on the carburetor body. The RB‑77 kit is compatible with C1Q‑S57, C1Q‑S57A, C1Q‑S57B, C1Q‑S57C, C1Q‑S57D, C1Q‑S137, C1Q‑S137A, C1Q‑S137B, and related models . Alternatively, verify your chainsaw model (017, 018, MS170, MS180) and the Zama carburetor series.
Q: What is included in the Zama RB‑77 repair kit?
A: The kit includes the metering diaphragm, pump diaphragm, metering chamber gasket, pump gasket, inlet needle valve, metering lever, spring, pin, welch plug, and fuel strainer . Some aftermarket versions may include additional components or upgraded Teflon diaphragms .
Q: What is the MOQ and lead time?
A: MOQ: 100 PCS. Delivery: 7‑14 days. Neutral export carton packaging.
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