GPRP modified valve adjusting screw
The GPRP modified valve adjusting screw has been modified to allow smoother valve opening of ktm / hva TPI / Tei.
This modification of the valve adjustment screw by GPRP modifies the action of the springs duringvalve opening allowing to tame and make more efficient the engine of your ktm / hva injection 2 stroke.
Fruit of many hours of development by Guillaume Porte, GPRP, famous suspension and engine tuner and former world championenduro (junior)
The tests showed that the GPRP modified valve set screw allows to have a optimal engine behavior when used with the COOBER box
For 250/300 TPI / Tei