AB-80031-R
Altitude changes have a large effect on the 4T carbs, these springs let you fine tune the slide spring pressure for different atmospheric pressures.
Red is best 0-4000 ft
Silver is best 4000-8000 ft
Blue is best 8000-12000 ft
Fits Evo 4-stroke Trial Models!
Beta Evo 4-stroke Carb Spring
Beta Original Parts
