Chainsaw sprocket and clutch drum replacement is straightforward.
Yes, you can do it with a few basic tools. You don’t need a dealer visit for this.
You’ll need:
- A socket wrench (typically 10mm or 13mm) to remove the bar nuts and clutch cover.
- A piston stop or a foot of old starter rope to lock the engine from turning.
- A clutch removal tool — usually a flat socket that fits over the clutch nut, plus a breaker bar. Some saws use an allen key instead.
- A puller if the clutch is stuck (common). A cheap two-jaw puller from Harbor Freight works.
- A thin flathead screwdriver to pry off the drum if needed.
Steps:
- Remove bar and chain, clutch cover, and chain brake assembly if present.
- Lock the piston using a stop or rope down the spark plug hole.
- Unscrew the clutch nut (left-hand thread on most saws — righty-loosey).
- Pull the clutch off. If it’s stubborn, use a puller.
- Slide off the old sprocket drum and bearing. The new one goes on in reverse order.
- Reinstall clutch nut, torque it, remove piston stop, reassemble.
Make sure you match the sprocket pitch and gauge to your chain. And don’t mix a rim sprocket with a spur — know which system your saw uses.
**A worn sprocket eats chains fast. Replace it every two or three chains and you’ll save