- Laboratory flow analysis proves Boyesen dual-stage reeds outperform standard reeds
- They permit greater flow velocity over the entire range of operating pressures
- Increased performance from start-up to top acceleration
| Compatible Vehicles | |||
| Years | Make | Make | Notes |
| 1981 | Yamaha | SR540 | |
| 1980 | Yamaha | SS440 | |
| 1999-2003 | Yamaha | VK540 III | |
| 1985-1990 | Yamaha | XLV XL540 | |