We are presenting the power valve adjuster for RR 250/300 and XTrainer, suitable for all model years. This accessory allows the adjustment of the power valve spring preload of 2-stroke 250 and 300cc engines, on RR and XTrainer of all model years without the need to use any tool. The preload adjustment allows you to modify the power curve delivered by the engine, enabling you to customize it according to your tastes and to the needs that the terrain conditions require. The new part number is available on stock in a limited quantity. It is delivered along with its mounting instructions.