Products Description
Piston Assembly for STIHL MS170/MS180 – 37mm & 38mm Options
Precision Engine Rebuild Kit for 017, 018, MS170 & MS180 Chainsaws
This piston assembly is a direct replacement for STIHL 017, 018, MS170, and MS180 chainsaws, available in both 37mm and 38mm bore sizes to match your specific engine variant . The piston assembly includes the piston, piston rings, wrist pin, and retaining circlips, providing everything needed for a top-end rebuild . The 37mm version fits older 017 and MS170 models without compression release ports, while the 38mm version fits newer MS170, MS180, and compatible MS171, MS181 models . Replaces OEM part numbers 1130 020 1207 (37mm) and 1130 020 1208 (38mm) .
Technical Profiles & Materials
Precision Cast Construction – Manufactured from high-quality alloy for durability and long service life. Precision-machined surfaces ensure proper sealing and optimal compression.
Compatible with New Models – Specifically designed for the new model MS170, MS180, MS171, and MS181 chainsaws. Available in both 37mm and 38mm bore sizes to match your specific engine .
Direct OEM Replacement – Replaces STIHL part numbers 1130 020 1207 (37mm) and 1130 020 1208 (38mm) . Also compatible with the 1130 020 1205 cylinder assembly .
Complete Assembly – Includes piston, piston rings, wrist pin, and circlips. Some comprehensive kits also include cylinder, crankshaft, bearings, gaskets, and spark plug for a full engine rebuild .
Technical Specifications
| # | Parameter | 37mm Specification | 38mm Specification |
|---|---|---|---|
| 1 | Piston Diameter | 37mm | 38mm |
| 2 | Compatible Models | 017, MS170 (older models) | MS170, MS180, MS171, MS181 (new models) |
| 3 | OEM Part No. | 1130 020 1207 | 1130 020 1208, 1130 020 1205 |
| 4 | Included Components | Piston, Rings, Pin, Circlips | Piston, Rings, Pin, Circlips |
| 5 | Ring Size | 37mm x 1.2mm | 38mm x 1.2mm |
| 6 | Compression Release | Without compression release port | Without compression release port |
| 7 | Common Kit Contents | Piston assembly only | Piston, Cylinder, Crankshaft, Bearings, Gaskets, Spark Plug |
Products Application
Top-End Engine Rebuild
Replacing the piston and rings restores compression when the saw experiences hard starting, loss of power, or blue smoke. The 38mm kit is the standard size for newer MS170 and MS180 models, while the 37mm kit fits older 017 and early MS170 units .
Full Engine Overhaul
Comprehensive kits include the cylinder, piston, crankshaft, bearings, seals, and spark plug for a complete engine rebuild in one package. These kits are ideal for saws with severe damage from lean fuel conditions or lack of lubrication .
Preventative Maintenance
If the saw is hard to start, low on power, or the spark plug is oily and black, piston and ring replacement is recommended. Worn rings allow oil to enter the combustion chamber, causing smoking and reduced engine life.
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 know if I need the 37mm or 38mm piston for my MS180?
A:The 38mm piston is used on newer MS170, MS180, MS171, and MS181 models . The 37mm piston fits older 017 and early MS170 models . To confirm, measure your existing cylinder bore or check your chainsaw's model variant and production date.
Q: What is included in a complete piston kit?
A: A basic piston assembly includes the piston, piston rings, wrist pin, and circlips . Comprehensive rebuild kits may also include the cylinder, crankshaft, bearings, oil seals, engine pan, intake manifold, spark plug, and gaskets .
Q: Why are there two different piston sizes for MS170/MS180?
A: STIHL introduced the 38mm bore as the standard for newer model MS170 and MS180 units, while older 017 and early MS170 models used the 37mm piston . The 38mm design also accommodates MS171 and MS181 models .
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