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The ARC 6611-28 billet flywheel is an SFI-certified upgrade designed for Briggs & Stratton Model 28 flathead engines with a vertical crankshaft. Commonly used in lawnmower racing and performance builds, it replaces the factory cast-iron flywheel with a precision-machined billet aluminum design for greater safety and reliability at higher RPMs.
Built for competitive use, the ARC 6611-28 features a replaceable 7075 billet aluminum ring gear. It includes hardware for the required starter upgrade, making it a durable, bolt-on solution for serious builds.
This flywheel is designed exclusively for Briggs Model 28 flathead engines with a vertical crankshaft configuration. Proper engine identification is recommended before purchase.
Ideal for lawnmower racing classes and high-performance small-engine builds where improved flywheel strength and safety are critical.
Part of ARC’s trusted 6611 series, this model follows the same high-performance standards used across multiple engine platforms.
The stock electric starter must be replaced with the larger Briggs & Stratton starter #845759.
This upgrade is required to properly engage the billet ring gear.
The ARC 6611-28 includes the hardware needed to install the larger starter, simplifying the upgrade process.
The ring gear is designed as a replaceable bolt-on component. This allows for easier maintenance and replacement without needing to swap the entire flywheel.
Regular inspection of the ring gear and starter engagement is recommended, especially in racing applications. Replacing worn components early helps maintain consistent performance and extends the service life of the flywheel. If you have any questions or concerns regarding maintenance, give us a call!
Fitment is intended for Briggs & Stratton Model 28 flathead engines with a vertical crankshaft. Verifying engine specifications before ordering is strongly recommended.
7075 billet aluminum offers significantly higher strength and resistance to wear compared to cast materials, making it better suited for high-RPM and racing use.
A larger Briggs & Stratton starter (#845759) is required for proper engagement. The flywheel includes the hardware needed for this upgrade.
The flywheel is SFI-certified, which meets the safety requirements for many racing classes. Always confirm specific class rules before competition.
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