No, I don't have the king K5, but I run its sibling, the green 250. We were riding the trails, and a friend had a YZF450. He thought he was top dog... until I continually showed him up on the hill climbs. After I showed him up, he asked to try the green beast... What he didn't know is I've regeared to my liking, dropped a tooth in the front, and added 2 in the rear. The bike is like a tractor... He almost flipped it the 1st time up the hill... after that he glided up on one wheel... He couldn't believe a 2 smoker, a 250 to boot (that's 7 years old), could do things better than his 450. Not to mention he has a whole lot more cash invested then I do... And mine is cheaper to maintain....