YX 140cc Kick Electric Start Engine + Wiring Kit + Carb PIT PRO DIRT BIKE. Brand New YX 140cc KICK + ELESTRIC START OIL COOLED Manual Engine Motor For PIT PRO PIT TRAIL DIRT BIKE THUMPSTAR. 4-Strokes, OIL-Cooled, Single Cylinder, Horizontal. Kick Start + Electric Start.