JDJetting Dirt Rider Power Valve Tuning Article 3- Turning PV Screw Inwards Lowers Power 5.5-7.5K rpm JDJetting Dirt Rider Power Valve Tuning Article 3- Turning PV Screw Inwards Lowers Power 5.5-7.5K rpm KTM 2-Stroke 250300 POWER VALVE TUNING -Picture Gallery