Three spring stiffness options (red soft, yellow medium, green stiff) for tailored power delivery
Enables precise tuning of power valve opening speed to match riding style
Compatible with all 2013 and newer Beta 125, 200, 250, 300 RR 2-stroke XTRAINER models
Allows transition from 4-stroke-like power to more aggressive delivery
Includes installation instructions for easy setup
Summarized by Shop
-Tuning Kit enables changes to power valve opening speed by changing inner spring stiffness -3 power valve springs; red (soft), yellow (medium), & green (stiff) have different stiffnesses -A stiffer spring with maximum preload slows opening speed and gives linear delivery; a softer spring with the least preload speeds it up and gives mo