What does the EXUP valve do?
What does the EXUP valve do?
This is a system that employs a variable EXUP valve in the muffler that can change the configuration of the exhaust duct in a way that controls fluctuations in exhaust pressure at the moments of overlap between the intake and exhaust valves in order to improve intake efficiency, boost power output and improve fuel …
What does EXUP mean?
Exhaust Ultimate Power Valve
Yamaha was the first to develop such a system, called the Exhaust Ultimate Power Valve (EXUP).
What is Motorcycle EXUP?
EXUP or Exhaust Ultimate Powervalve, was a sort-of four-stroke version of the YPVS system Yamaha had used in their two strokes for a while. The valve in the exhaust stayed shut at low revs, increasing back pressure and boosting power.
Do you need a servo buddy?
Servo Buddy is a must-have when switching to an aftermarket exhaust, and even works great with a factory system if you want to eliminate the servo motor and fix the exhaust valve in the open position. Servo Buddy allows for a complete elimination of the servo motor, valve & cables.
What does a servo buddy do on a motorcycle?
The Servo Buddy is a small, light weight servo fix that eliminates the need for the exhaust servo motor, which is not needed with any aftermarket exhaust system. These devices are typically called EXUP valves, SET valves or exhaust servos.
What does a motorcycle exhaust servo do?
The cables are used to isolate the motor from the hot exhaust and allow it to be placed in a more convenient place on the bike. The purpose of this system according to the motorcycle manufacturers’ marketing departments is to create back-pressure at lower RPM’s to increase torque.
What does a motorcycle exhaust valve do?
Exhaust valves can also be used to significantly reduce noise through certain parts of the rev range, but also increase the back pressure too, which can be used to give an small boost in mid-range power. The overall story is your bike needs an exhaust to run properly.
Do I need a servo buddy for a slip on exhaust?
The servo buddy is by far the best solution to eliminating the servo motor. Plug in and forget. If you have only installed a slip on exhaust with no other changes you don’t need it.
