This past summer I replaced the original MAF sensor with a spare I picked up. I reinstalled the original yesterday and the problem persists. I’m going to grab a can of CRC MAF cleaner and clean the “spare” and see what happens. I’m not expecting much.Given the ignition system is in good repair, that sounds like a MAF problem to me, which could also explain the flat spot. Since the c900T has no way of sensing load, it relies on the MAF for pretty much everything.
I also picked up a cheap fuel rail/injector assembly off eBay. I’m going to modify the banjo bolt and add a schrader valve so I can run some fuel pressure checks.