On a Keihin PWK theres a slide adjustment screw. Make sure yours is adjusted properly. Try turning it clockwise to screw it in a bit and see if that doesnt help. Mine wasnt adjusted properly and it was keeping me from idling at all. No matter what I did to the pilot circuit or the pilot jet, I couldnt idle.
Once I got it to idle, I jetted my pilot circuit by setting the pilot screw 1.5 turns in, and playing with it to idle. If you have to turn the pilot OUT you are too rich and need to drop your pilot size, and try that.
For a base point to start, elevation is a big deal. The lower you are, the richer you gotta be. Good point of starting for you would be a 45-50 pilot. You MAY need richer, you MAY need leaner.
Im not bored to a 230, but I was running a PWK36 on mine, Im bored .040 over (so like 202cc LOL), and I was running a 120 main and a 30 pilot and my pilot circuit was great, but my main was too rich. Im at 4200 feet elevation where I live, so if youre closer to sea level, youre gonna have to adjust accordingly. Not to mention your engine will flow more air period.
Id start with a 45 pilot and see if you can get it dialed in. But in my experience, no matter WHAT pilot you have, on a PWK (unless its WAY too small), you should be able to get it to idle with the slide screw adjsuted properly, and making sure your throttle cable is adjusted properly.
