ARC Racing 6623 Billet Flywheel for GX340/390

The ARC Racing 6623 Billet Flywheel is precision-engineered in the USA for optimal performance and durability. Designed to fit GX340/390 engines with non-adjustable timing, this SFI-certified flywheel delivers consistent 24-degree timing with a stock key, ensuring reliable operation without modifications. Built to meet high-performance standards, it’s ideal for racing and high-load applications where reliability is critical.

Note: This flywheel is not compatible with newer UT2 coils featuring an integrated 4500 RPM rev-limiter. For best results, maintain a minimum coil gap of .030 to ensure proper ignition timing and engine efficiency.