stomp 140cc pitbike z3 off road motorbike big wheel thumpstar
The Stomp Z3-140 Dirt Bike, stomp 140cc dirt bike z3-140 still boasts the ‘exclusive to Stomp’ SR140C Z40 cam engine. Stomp buy in the YX140 and then fettle the engine with stiffened valve springs & a high lift race cam (known as the Z40 cam).