Hey there! I am having problem with my YPVS (cable thing just got torn apart) but would the engine run if I just opened it permanently? How was that after you did it?They are very rare and very expensive. I considered it but in the end just pegged the valve open.
Take the exhaust off and get it so the outlet is bigger (you will see what I mean when you turn the valve) and smooth. Then peg the valve at that. You will have nothing low down (below 6k) but when you hit that powerband none of it matters lol. Mine would get through a head gasket in 300 miles when full power though.