Products Description
MS250 Chainsaw Clutch Drum Set – Complete Replacement Kit
All-in-One Clutch Drum Assembly for STIHL MS250 & Compatible Models
This clutch drum set is a complete replacement kit for the clutch and chain drive system on STIHL MS250, MS210, MS230, and their predecessor models 021, 023, and 025 . Available in both 3/8" LP (Low Profile) and .325" pitch configurations, this comprehensive kit includes the clutch drum, 7-tooth sprocket, needle bearing, retaining clip, washer, worm gear, clutch assembly, and spark plug – all components needed for a full drive system restoration. Replacing worn components as a complete set ensures reliable power transmission and prevents premature failure of new parts . This set is ideal for professional arborists, firewood processors, and chainsaw repair workshops.
Technical Profiles & Materials
Complete All-in-One Kit – Includes clutch drum, rim sprocket, clutch assembly, needle bearing, retaining clip, washer, worm gear, and spark plug – everything needed for a full clutch system overhaul in one package .
Pitch Compatibility Options – Available in 3/8" LP (Low Profile) with 7-tooth spur sprocket and .325" with 7-tooth rim sprocket configurations . Select based on your existing chain pitch – the two systems are NOT interchangeable.
OEM-Spec Replacement Fitment – Replaces STIHL OEM part numbers 1123 640 2003, 1123 640 2073 (3/8" LP spur sprocket), 1123 640 2074 (.325" sprocket), 1123 160 2001 (clutch assembly), and 1123 640 7102 (worm gear) .
Durable Metal Construction – Manufactured from high-hardness metal with excellent wear resistance, capable of withstanding demanding cutting conditions and extended professional use .
Technical Specifications
| # | Parameter | Specification |
|---|---|---|
| 1 | Compatible Models | STIHL 017, 018, 021, 023, 025, MS170, MS180, MS210, MS230, MS240, MS250 |
| 2 | Also Compatible | MS211, MS231, MS251, MS260 (bearing compatibility) |
| 3 | Pitch Options | 3/8" LP (Low Profile) or .325" |
| 4 | Sprocket Teeth | 7 |
| 5 | Sprocket Type | Spur (3/8" LP) or Rim (.325") |
| 6 | OEM Sprocket Ref (3/8") | 1123 640 2003, 1123 640 2073 |
| 7 | OEM Sprocket Ref (.325") | 1123 640 2074 |
| 8 | OEM Clutch Ref | 1123 160 2001 |
| 9 | OEM Worm Gear | 1123 640 7102 |
| 10 | Kit Contents | Clutch drum, sprocket, clutch assembly, needle bearing, retaining clip, washer, worm gear, spark plug |
| 11 | Material | High-hardness metal |
Products Application
Clutch & Drive System Overhaul
When the chain drive becomes inconsistent, the clutch slips, or sprocket teeth show wear, this kit provides all necessary components for full restoration. Replacing the complete assembly ensures all wear-prone parts are renewed simultaneously, preventing premature failure of new components. The included worm gear is essential for proper chain lubrication.
Replacement for Damaged Components
Direct replacement for worn or broken clutch drums, sprockets, bearings, and worm gears on MS250 and compatible STIHL saws. The comprehensive kit ensures all components are renewed, eliminating the need to source individual parts.
Preventative Maintenance
Sprocket wear can be difficult to see but causes poor chain engagement and power loss. Replacing the complete clutch drum assembly as a set ensures consistent cutting performance and extends chainsaw service life. The included spark plug adds value for routine maintenance.
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 pitch set I need for my MS250?
A:Check your chainsaw's existing chain specification. The chain packaging or bar will indicate pitch (.325″ or 3/8″). The 3/8″ LP set is more common on MS250 class saws while .325″ sets are also widely available. The two systems are NOT interchangeable – using the wrong kit will result in chain drive incompatibility.
Q: What's included in a complete clutch drum kit?
A: Typical kits include: clutch drum, sprocket (spur or rim type), clutch assembly, needle bearing, retaining clip, washer, worm gear, and spark plug . Some kits may also include additional components like guide nuts and clutch claws depending on the supplier.
Q: What are the OEM part numbers this kit replaces?
A: Depending on configuration, this kit replaces: 1123 640 2003, 1123 640 2073, 1123 640 2074, 1123 160 2001, 1123 640 7102, 1123 007 1032, 1123 007 1003, and 9512 933 2260.
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