STIHL 90° Cranked Piston Stop Special Service Tool (Part # 4221 893 5900)

If you’re wrenching on a STIHL chainsaw, this is the right tool for the job.

It’s the genuine STIHL 90-degree cranked piston stop, part number 4221 893 5900.

Sticking this into the spark plug hole lets you lock the piston in place, making it a breeze to remove the flywheel or clutch without the engine spinning on you.

It’s a simple, solid piece of metal—just what you need for serious repair work.