Description
If you’re running a Keihin FCR carburetor and experiencing bog on throttle apply or struggling with hot starts, the Boyesen Quick Start -3 APC-3QS solves both problems with a single, bolt-on upgrade. This investment-cast check valve assembly delivers precise fuel metering across the entire throttle range while the integrated Hot Start Assist eliminates the frustrating multi-kick procedure on a warm engine. The result is sharper throttle response, improved low-end power, and more consistent performance in any riding condition.
- High-volume vertical check valve
- Tunable leak jet design
- Integrated Hot Start Assist
- Patented anti-bog technology
- 25% increased fuel capacity
- Investment cast construction
- Precision-finished tolerances
- Bolt-on installation
- Fits all Keihin FCR carbs
- Improved low-end performance
- Enhanced throttle response









