Holy crap this thread got off track. For 3 yrs i ran vzb speeds. I love those engines. The new xzb speeds are in my opinion one of if not the strongest stock engines. I have seen the xzb blue head run well also. If i had my choice out of all for a buggy it would be the vzb based engine. So if the hara runs like the older speed then snatch it up. If i remember the difference, the hara didn't have a slugged crank. Is that correct?