Active filters
- Complete set for two pistons: top, second, and oil control rings.
- Barrel face top rings and Napier second rings with reverse twist for improved sealing.
- Three-piece Flex Vent oil rings with four steel rails and two expanders for positive oil control.
- Made in the USA.
Complete set of top, second, and oil control rings for two pistons. Restores sealing and controls oil consumption.
Complete kit with top and second compression rings plus three-piece oil control rings; includes rings for two pistons.
Precision-machined cast iron valve guide for durable, reliable valve seating; compatible with no-lead fuel and accepts special seals (sold separately).
Precision-machined cast iron valve guide compatible with unleaded fuel; made in the USA.
Shouldered valve guide offering a positive stop for easy installation, precision machining, and straightforward finishing. Made in the USA.
- Bolt-on power: +40–50% on stock 107", 114" and 117" M‑Eight motors.
- Compressor and turbine housing with Garrett internals; plenum with integrated blow-off valve.
- Includes injectors, spark plugs, boost gauge with mount, oil feed/drain lines, custom cam cover, tune files, hardware and gaskets.
- Requires Thundermax ECM (sold separately). Does not fit Twin Cooled or non-removable fairing lowers. Offroad use only.
- Made in the USA.
Transparent cam cover designed to match Assault series air cleaners. Made in the USA.
Progressively wound racing valve springs offering improved fatigue life and consistent high-rpm performance.
Precision-machined nickel bronze construction for excellent wear resistance and heat conductivity.
Compatible with no-lead fuel; accepts various valve-stem materials.
Accepts special valve guide seals (sold separately). Made in USA.
Precision-machined shouldered valve guide for superior wear resistance and efficient heat dissipation.
Precision-machined cast-iron valve guide compatible with unleaded fuel; OEM-style replacement.
Precision valve guides with tapered nose design, no-lead fuel compatibility, and top-hat seal fitment. Made in the USA.