Description
Stock reed valves limit your engine’s breathing potential across the entire RPM range, leaving performance on the table from idle to redline. The Boyesen dual-stage reed design increases flow velocity under all operating pressures, delivering measurable gains in throttle response, acceleration, and peak power. Backed by laboratory flow analysis, this is a bolt-on upgrade that speaks through dyno numbers, not marketing claims.
- Dual-stage reed design
- Laboratory flow-tested
- Increased flow velocity
- Improved start-up performance
- Enhanced mid-range acceleration
- Optimized top-end power
- Kawasaki/Yamaha compatible
- MPN: 646
- Bolt-on installation
- OEM replacement fitment
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