HELP! I'm kinda lost when it comes to carburetors. I've got a 2004 CRF80 that runs fine, excpet that when I give it full throttle from an idle, it kinda coughs and nearly dies (if I rev it slowly, it runs OK). I tore the carb down and cleaned it, but I'm not sure I've got the air and throttle screws adjusted properly. I followed the instructions in the service manual, but still have the same problem. I'm thinking there's another problem? I cleaned the air filter recently so I don't think that's the problem. Any suggestions?