Mtanlo .325" 7T Clutch Drum & Oil Pump Kit for Stihl 021/023/025 MS230 MS250 — Complete Clutch, Worm Gear & Hoses

Mtanlo’s complete .325" 7-tooth clutch drum and oil pump kit replaces worn drivetrain and oiling parts on Stihl 021, 023, 025, MS230 and MS250 chainsaws.

This kit bundles the most commonly failing components—clutch drum, clutch shoe, worm gear, bearings, oil pump and fuel/oil hoses and filters—so you can restore reliable sprocket rotation and consistent bar lubrication without buying parts separately. Each numbered piece is matched to the listed Stihl part references for straightforward swap-in compatibility, making it a convenient option for DIY chainsaw maintenance or field repairs.

Will this kit fit my Stihl 021, 023, 025, MS230 or MS250?

Yes—this assembly is designed to match the .325" pitch, 7-tooth clutch drum profile used on those specific Stihl models. The included components correspond to multiple OEM numbers commonly used for these saws, improving the chance of a correct fit. Still, verify your machine’s specifications and compare the part numbers before installation.

• Includes .325"-7T clutch drum compatible with listed Stihl models
• Replaces common OEM references such as 1123 640 2074 and 1123-160-2050
• Contains both oil and fuel hoses plus filters for full system refresh

How does the kit improve chainsaw performance in practical terms?

Replacing the clutch drum, worm gear, bearing and oil pump reduces slippage and restores accurate chain speed and oil delivery. That results in smoother cutting, less wear on the chain and bar, and more consistent lubrication to the guide bar during operation. New seals and filters also help prevent contamination and air leaks that can harm engine responsiveness.

• New needle bearing and E-clip for secure clutch engagement
• Oil pump and filter restore steady bar-oil flow
• Fresh fuel and oil hoses reduce leak and clog risks

What’s included in the package and which parts should I expect to replace?

The package supplies everything needed for clutch drum and oiler component replacement in one kit, so you won’t need to source separate small parts. It covers mechanical and lubrication items that commonly fail or wear, giving a comprehensive refresh of the drive and oiling systems. Basic mechanical skills and common tools are sufficient for most installations.

• .325"-7T clutch drum, clutch shoe and clutch washer
• Worm gear, needle bearing and E-clip for the clutch assembly
• Oil pump, oil hose, oil filter, fuel hose and two fuel filters

How difficult is installation and what should I check after fitting?

Installation is moderate: remove the bar and chain, disassemble the clutch drum area, swap the old parts for the new kit items and reassemble. After installation, confirm clutch engagement, proper chain rotation, and consistent bar oil flow at idle and operating speeds. Re-check fasteners and hose connections for leaks or looseness after a short test run.

• Requires basic hand tools and safety precautions
• Test oil feed and clutch engagement before full use
• Inspect for leaks and retorque fasteners after initial run

Who is this for: this kit is aimed at owners and technicians who need a full replacement for worn clutch and oiler components on .325" Stihl saws (021, 023, 025, MS230, MS250). It’s convenient for field repairs, shop rebuilds, or anyone wanting to restore reliable chain drive and consistent bar lubrication without hunting down multiple small parts individually.