Engine

Active filters
Includes top and second compression rings plus three-piece oil control rings; supplies enough rings for two pistons for reliable sealing and oil control.
Complete replacement ring set with top and second compression rings plus three-piece oil control rings. Restores compression, controls oil, and improves oil economy. Includes enough rings for two pistons. Made in the USA.
Complete set of top, second, and three-piece oil control rings for two pistons. Barrel face top rings and Napier second rings provide improved sealing and heat transfer; three-piece Flex Vent oil rings ensure positive oil control. Made in the USA.
Complete replacement piston ring set with PVD coating: barrel face top rings, Napier second rings, and three‑piece flex vent oil control rings. Includes enough rings for two pistons.
- Indexes spark plug electrode gap toward intake valve
- Includes five 0.40" thick, five 0.50" thick, and five 0.60" thick washers
- Made in the USA
Compact crankcase vent filter for reliable ventilation and easy installation.
Precision-machined tubeless valve with self-sealing hex cap; anchor nut, thrust washer and rubber seal included. May require drill enlargement for Lester™ mags.