I got the 26mm SI carb from SIP and installed it on a P200E, stock except for a Sito Plus exhaust. The main jet is 109- I live at 6000 feet altitude.
When the scooter is really warm, it seems to almost stall at 3/4 to full throttle, like it is running out of gas, but after a few seconds it kicks back in. I checked the CDI box by trying a known good one, same problem. The bike did not do this with my old carb.