Flywheel Puller

What Is a Flywheel Puller and Why Do You Need One?

Flywheel pullers are among the most indispensable specialty tools in any powersports or small-engine mechanic's toolkit. Whether you're servicing a motorcycle, ATV, scooter, personal watercraft, or small outdoor power equipment engine, accessing the ignition timing components, stator, or crankshaft often means one thing first: removing the flywheel.

The challenge lies in how flywheels are mounted. Virtually every flywheel or rotor is attached to the crankshaft by a taper — a precision interference fit that locks the flywheel in place under normal operating conditions. Over time, heat cycling, corrosion, and torque from the retaining bolt can make that fit exceptionally tight. Attempting to pry or hammer a flywheel free risks damage to the flywheel itself, the crankshaft threads, or delicate rare-earth magnets embedded in the rotor. A proper flywheel puller applies controlled, even mechanical force to break the taper loose cleanly and safely.

How Flywheel Pullers Work

Most flywheel pullers consist of a threaded body or disc that engages the flywheel's own puller holes or threads, combined with a central lead screw that bears against the end of the crankshaft. As the lead screw is tightened, it builds axial force directly against the crank taper, popping the flywheel free without hammering or prying. Some designs are a single hardened bolt that threads directly into the flywheel hub — these are common on smaller single-cylinder engines. Universal multi-hole disc-style pullers accommodate a wide range of bolt patterns and thread sizes in one compact tool, making them popular for shops that service many different makes and models.

Choosing the Right Flywheel Puller

Getting the correct puller for your application is critical — using a puller with the wrong thread pitch or diameter can strip the flywheel's puller threads, causing expensive damage. Key factors to consider include:

• Thread size and pitch: Flywheel puller threads vary widely (e.g., 24mm, 27mm, 30mm, 38mm, 40mm, and more) with both right-hand and left-hand thread options depending on the engine.
• Bolt pattern: Universal disc-style pullers typically accommodate multiple bolt spacing configurations, while OEM-style pullers are machined to match a specific engine family.
• Material and construction: Quality pullers are machined from hardened or heat-treated steel to withstand the high stresses involved in breaking a stubborn taper fit.
• Application: Some pullers double as clutch-hub or magneto-rotor pullers, expanding their utility across multiple jobs.

Top Flywheel Puller Brands

DSS Racing (Dennis Stubblefield Sales) has been a trusted name in powersports specialty tools since 1976, producing American-made flywheel pullers for motorcycles, scooters, ATVs, UTVs, and personal watercraft. Their extensive catalog of model-specific pullers — including the popular MP#1 for GY6 engines and the universal MP#37 disc — reflects decades of focus on getting the thread specs exactly right for each application.

BikeMaster has been a go-to brand for powersports mechanics since 1981, offering a broad range of magneto flywheel pullers built from high-quality tool steel with an anodized black finish. BikeMaster's universal flywheel pullers cover multiple thread sizes in one compact tool and are backed by a manufacturer's lifetime warranty, making them a smart investment for both professional shops and home garage enthusiasts.

Briggs & Stratton brings OEM-grade expertise to flywheel service tools for small outdoor power equipment engines. Their flywheel pullers are engineered specifically for the engine families they manufacture, ensuring a precise fit that meets factory service standards — an important consideration when working on lawn mowers, generators, and other small power equipment.

Bikeservice is a specialist brand focused on professional-grade motorcycle and powersports service tools, offering application-specific flywheel pullers designed with the working mechanic in mind.

Parts Unlimited is one of the powersports industry's leading distributors, and their flywheel puller offerings give riders and technicians reliable access to the service tools needed to keep powersports equipment running at its best.