i had the same problem with my 2000 zxi although i just needed to get it off idle then i could hammer the throttle, but you need to clean the carbs. and let me tell you it sucks trying to get those things out and back in. but what you can do is what i did at first was buy a product called "quickclean"...its a quicksilver brand (mercury). but take your fuel filter off empty the gas and fill it with the quickclean...(warm your engine up first so it will start right up) and once the engine is running hammer the throttle so that quickclean will go through. (dont worry it won't hurt the engine). but see if that helps, it should.