Ok, what exactly is the engine doing? Is it revving out of control with no throttle input from you? The throttle cable hasn't been pinched and/or is binding, is it?
First off, the CDI box isn't the problem. It runs, so it has spark. Rule that out. The reeds probably aren't to blame, either. If the throttle cable is OK and the slide moves freely in the carb, rule that out for the moment as well.
It sounds to me like you have an air leak somewhere in the engine, causing it to run lean. It's time to do a leakdown test and see what's going on. Also, be sure the rubber washer is present and intact under the carburetor cap.
Also, what, if any, mods does your blaster have? Stock or aftermarket pipe? Airbox lid on or off? Etc...