Ok, so I've got this bike all put together and it had been running great. Would start first pull pretty well every time. Well, lately it has been quite difficult to start, so I checked some of the usual things. Pulled the plug and it was quite black, seems to be running overly rich. It seems to run fine--when it's running! I don't know if anyone else has done this before, but I am running a Tec carb on this 3 horse briggs. It fit pretty well against the head, but I'm just wondering if I've got a carb/engine setup that is not compatible? I've tried leaning things out but I just can't get it to run quite right if I set it too lean. I've got the high side and idle side out 1 1/2 turns approx. I attached some pics to try to give a better idea of what carb I've got--if needed I can get better/more detailed pics of the carb...these were previously posted pics! Thanks for any help.