I have done some work to my XPW. I am running no base gasket. I raised the transfers 3 deg, widened the exhaust port to 68% of bore diameter and enlarged the entire exhaust outlet as well as matched the exhaust gasket and muffler to the newly enlarged outlet. It goes without saying that I added a second port to the muffler as well... I did not raise the exhaust or do anything at all to the intake. This is where I stopped and I think it runs pretty strong for my first attempt. It's spooling north of 13.6k no load (unlimited coil) and holding just under 12k in the cut on 18" ash. I should also note that I can still lean out the high side a bit more as it still 4-strokes in the cut a little bit.
I would have to check my notes to give numbers as I don't recall them off the top of my head.
What I can say is that based on advice given by people here and elsewhere whose opinions I trust, I will be going back in one more time and raising the exhaust to about 100 and raising the transfers a little more. I want to say that my transfers are at 123 deg right now, but I'm not 100% sure as I'm going from memory and don't have my notes in front of me.
This is how my XPW runs as of now. Still not on the same level as the pros here who port saws for a living, but I'd be lying if I told you I'm not a little bit proud of what I have done thus far.
Mattyo, I look forward to seeing how you do yours and the results.
I will certainly post up when I go back into mine and make the last changes I want to do. There doesn't seem to be a heck of alot of XPW builds, nice to see another one in progress.
