I was looking at the electric start version of the 223 and a Tav30. Thought of grabbing a pipe and EC WC22 carb kit. Is the WC22 carb what you are using? Did you get around to doing more upgrades?
On this WC I'm running the stock carb and you can change the Jet in it if needed. Unless you're going to completely remove the governor and upgrade with a pinnacle forged rod and an aluminum flywheel and a cam like the ghost buster. I suggest not changing the carb over to a slide style, ya don't need too. The stock carb works great with a stage 1. Go Power Sports has a nice header made for the CT200U-EX it with a RLV mini 91 or RVL 4101 will actually give you better performance than an open header.
Yes, I've done 7 modified WC223's for friends, customer and myself, so far. Keep in mind, if you change the flywheel, unless you want to spend around $200 you're going to loose your charging coils. Unless you're wanting to build a racing mini, I suggest you stick with the upgrades I mentioned. You will be surprised by the performance and reliability. For the 200U-EX I use the $35 riser off Amazon along with the CVT that cost around $70 and they work great. I also found that the WC's like the NGKBPR6ES gapped at .030. I also only run non ethanol 93 in all mine. My stage 1 CT200 is a wheelie pulling beast and has more than enough top speed, with how I told ya too set your governor. Do Not zip tie or disable your Governor or even talk about doing so on this forum, not only is it dangerous, it's against the rules and I don't want to see ya get banned for it.
Yes, I've used the WC22 carb, but on very modified WC223's with frame mounted fuel tanks. They Do Not work well at all with engine mounted fuel tanks. If you're wanting a performance engine, take a look at the WC223 GT1 or the GT2, the GT2 is how I do the performance builds.