All 2st Keihin 36mm or 38mm PWK

I'm looking for some help from you guys. I have a '06 WR 125 that is stock right now. I have my EG 144 kit to install this week or next. I was thinking about going with a PWK as well. I have been reading about them and from what I understand they are better than the stock. My question is why are they better? Which one would be better on a 144 woods bike? Also any ideas on jetting would help so when I order the carb I can get the right jets at the same time.
Thanks for your help.

Since your putting on the 144 kit, I would definitely recommend the 38mm PWK A/S.

The PWK carb by most accounts provides easier jetting, better fuel economy, and most of all better throttle response from low to mid.

As for jetting, I'd start at 180 main, ddk or jd blue in richest position 48 to 50 on the pilot and lean/richen as necessary.
Also if you order from carb parts warehouse they will probably have a baseline for your situation. I'd hope that my recommendations would be in their ballpark.

This thread is a start. I've been wanting to try a 38 myself.

http://www.thumpertalk.com/forum/showthread.php?t=630538&highlight=pwk

A search for "PWK" on the TT 2t forum will give you a couple hours of reading.