i had pc do my top end.they said i needed new barell,i wanted it ported for pump gas,they ported it for c12.they recut combustion chamber in the head,it took about a month before it was ready,also to use yamalube 32:1.price for my top end ran about 1200 bucks.600 just for the new barell.my kx5 rips.they are kind of cocky,but do really good work.they have one of danny hamell's kx5 on display with huge dual baja light kit,soooo sweet!!!!