I need some help. A buddy of mine's son has a 300ex that is missing out. It seems to run fine some of the time and then it will sound like it hitting the rev limiter. When a half throttle and in the middle of the rpm range, it's fine. But give it full throttle still in the mid rpms, it starts missing. I have cleaned the carb twice and we dropped the jet size back down to stock (it has a supertrapp on it a is the only mods), and put a different CDI box on it. It actually sounds like the choke is on but it's not and it doesn't do it at half throttle. We have removed the air box lid and that didn't help. If anyone has any suggestions, I would appreciate it. We are heading for a two day trip a the Badlands in Attica Friday and Saturday and we need it for him then.

Thanks,
Tim