About to throw this thing in the creek... Brand new 2018 Icebear fuerza 125cc... 385miles on it, just did a carb swap cause the stock one was a pos, no air/fuel screw, couldn't rejet, needle jet was set to highest level on lean and unadjustable, bike jerked, lurked, sputtered, whatever.. Went with the mikuni vm22 26mm, ran great at first until I started pushing 45mph (top speed originally 65ish) and it warmed up.. I also added a Akrapovic exhaust and mid pipe, figured I needed a bigger main jet like everyone told me I needed to do so, I put a 110 main jet, they recommended 115-125 which i thought was a big bump, stock was a 98.. Figured that was the issue that I was needing more fuel at full throttle with that exhaust and carb and air filter.. No, didn't help, hit 47 and started to jerk and backfire so let off the throttle and took it home. If I pull quick full throttle now it also dies out, I have to slowly roll on the throttle for it to not die. Tried adjusting air/fuel mixture screw, I seated it, went 1 1/2 turns and went from there to probably 3 turns out, didn't really see a difference.. Engine seems to be running hotter now as well which doesn't make sense cause I'm running the mikuni air filter pod so it's getting maximum air flow... where do I go from where. Step by step, lay this **** out for me, be clear and simplify it incase I go full retard, id appericate it. And spark plug seems to be a nice coffee and cream look, so can't get a diagnoses off that either.