Here's a picture of your plug
That's kinda ugly but not quite what I was expecting. I was expecting it to be much whiter. Here's the thing:
American Sportworks carbs tend to run lean in stock form. I've got a wide band O2 sensor that allows me to exact which jet I need. With an aftermarket exhaust and a cam, a 140 main jet was required. When I added the UNI, it went up to a whopping 150 main jet to get the correct AFR!
In stock form, a helix likes a 128 or a 130 main jet (your 127 would be fine). With your mods, you need to bump that baby up. Give me a sec, and I will find the pic of my plug with the proper AFR. If you run lean, your engine can (and probably will) go boom. Hang on just a sec for the pic of what your plug should look like. I am going to move this thread to the GY6 tech section.