Stomp Z3R-140 140cc Race Pit Bike - 14/12" Wheels. Bars Pro-taper style minibike bars. The Z3R-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).
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