Update.
I got lazy and didn't want to rejet carb from factory specs, install carb, test jets/carb, uninstall carb, drill vacuum ports, reinstall.
So I rejetted and did the vacuum ports at same time.
I rejetted from factory 3mm white washer on pilot needle to 1.5mm (three washers from lancer's carb jet kit) and from a 145 main to a 152.5 main. It's still a little lean on pilot needle (factory settings are ridiculous). Only change was switched from factory air filter to "HiFlo" one.
The original vacuum ports are approx 3/32 (a very little bit bigger).
With the carb cleaned, and off bike, I blew into air port that pushes diaphragm to move the slide up/open. I did this over twenty times to chk its movement.
Took carb apart to start the drilling...the only bigger drill bits I had were 7/64 and 1/8. I did 7/64 with a little bit of rounding motion as I drilled to open up the ports more. I also changed the two screws that hold the pilot needle on the slide (used allen cap head M3x6). I'm sure these added a very small weight gain.
By my rough calculations each vacuum port area was increased 33% to 50% more. So I almost doubled total area. Had to use this site
http://www.mathsisfun.com/geometry/circle-area.html cause my 'circle math' is rusty.
I put the carb back together.
What a difference when I blew into air port. The slide moved noticeable faster but still smooth. Way faster. The throttle feels more responsive...how much is from porting or rejetting is impossible to tell. When I open throttle wide open the initial hesitation is decreased and acceleration seems a lot more connected to my wrist. Doesn't have the feel of a pumper carb but feels a lot less like the acceleration from CVT. No real difference when I decelerate, but I never payed attention before either.
It's been a few hundred miles, so far so good. I'm not worried about any long term damage. The slides plastic is stout and has to deal with constant engine vibes.
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