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does anyone know about these and where to get one ? /

Hi Guys I am wondering what your thoughts are for a 125 race engine, we want reliability and torque and hp , the moment the gearbox in my daughters current quad , smashed the selecter gear between 2nd and 3rd gear , she is racing Motor cross on her quad, the engine is a yx 150 bottom end...

Hi im new here , Im wondering what everyones thoughts are on the 155z engines., the engine in question is a 2010 build. Is this the HO motor ,how can I tell on the engine?, the barrel has 155z stamped on it. cheers Shannon