one other mod i did to my pwk was to address running out of fuel at wot.  The mikuni has a great set up for fuel to the bowl.  nice large fuel line port and float seats you can change out orifice sizes.  You cannot do this on the pwk.  I was running out of fuel at wot for longer runs / taller gears.  I moved the foats up to the border line of flooding over and ever so gingerly drilled out the bowl vents to a larger size.  The two bowl vents are just tiny out of the box.  I also lined up the holes on the bowl drain / jet plug with the bowl divots gaining a few cc's more fuel capacity.  No more wot fuel starvation issues to date.

Side note**
If you F up your pwk drilling the bowl vents out, dont cry to me!  i did it pre-beers for increased accuracy