so I've been thinking about throwing some more money at my old CR500, a popular mod seems to be replacing the ancient PJ with a PWK, but could someone tell me what the main benefit is with the PWK? more power? more revs? easier jetting? I don't really have any issues with the PJ, starts 1 kick cold and hot, runs smoothly, idles just fine despite that crappy choke-knob adjuster thingy it has. anyone done this swap who can share their experience with me?