-Tuning Kit enables changes to power valve opening speed
-3 power valve springs; red (soft), yellow (medium), & red (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 more hit
-Different springs enable a more linear or aggressive power valve opening speed
Fits all 2013-on 125/200/250/300 RR 2-strokes & XTrainers. Our resident tester prefers the yellow in his XT; "Gives it 4-stroke-like power, making the midrange more useable."
Beta 2-stroke Power Valve Spring Kit
Beta Original Parts