RS-4D Full Systems
The new RS-4D builds on the technology that has made the RS-4 a force to be reckoned with on the racetrack, enhancing it's rock solid performance. By increasing the amount of open area at the exhaust outlet, the RS-4D increases airflow, resulting in smoother power delivery and increased throttle control. Preliminary testing has shown that it offers increased horsepower and torque throughout the power curve, especially in the bottom to mid RPM range.
RS-4 Slip-Ons and Full Systems
As the official exhaust of the Rockstar Makita Suzuki Yoshimura Supercross/Motocross team, this exhaust was designed with one thing in mind, winning races. The RS-4 is a unique design with predicated power, a side benefit of a quiet earthy exhaust note that speaks volumes for performance. It was an obvious choice for the CRF250R.
Coming Soon...
Data Box
The optional DATA kit consists of an air fuel sensor and amplifier box that plugs into the PIM2, and allows for self-mapping of the motorcycle. Self-mapping means that as the user rides the bike on a dyno or on a closed course, the DATA Box automatically calculates the required fuel adjustment at each RPM and Throttle Position to reach the user selectable target air fuel ratio.
PIM 2 Engine Managment System
Yoshimura has been a leadership company in EFI management for years. By the time all these other guys figure out what we already know - the race will be over. Check out our race proven PIM units. They have a long track record of performance, durability, and ease of use.
The optional DATA kit consists of an air fuel sensor and amplifier box that plugs into the PIM2, and allows for self-mapping of the motorcycle. Self-mapping means that as the user rides the bike on a dyno or on a closed course, the DATA Box automatically calculates the required fuel adjustment at each RPM and Throttle Position to reach the user selectable target air fuel ratio.
Yoshimura has been a leadership company in EFI management for years. By the time all these other guys figure out what we already know - the race will be over. Check out our race proven PIM units. They have a long track record of performance, durability, and ease of use.
Hard Parts
Whether you’re racing on a closed course, or blazing the open trail, you want your bike to look and run better than any other. Yoshimura's hard parts line-up includes a variety of pieces that can give your machine the tricked-out look you want, while maintaining the high performance and attention to detail that Yoshimura is known for. These parts are machined from aluminum alloy for high strength and significant weight savings over the stock units.