Bitter learning curve. Absolutely DONE with carburetors!!!

I'm running a PVC valve from the rocker cover to the carb. I do have acheap version of the stethoscope but haven't used it yet. It did squeel one quick second when I revved it yesterday, it's never done that before but it sounded lke a belt. It would be hard to record the sound over the exhaust, I'm going to start it this weekend and record what happens. I'd still like to hear opinions though. The grey film isn't moisture, but it could very well be just a new motor breaking in. I'll get some pics or videos I know it's hard without them to diagnose.