Not all 9/17's are the same. Pretty sure this is the one sxipro02 is referring to: http://impros.com/store/index.php/impellers/skat-trak-impellers/skat-trak-kawasaki-pwc-impellers/skat-trak-kawasaki-140-75-swirl-impeller.html
Another vote here for the Factory limited pipe. Big difference over stockers that I've ridden. By the way, there's usually a used one available here or on Ebay if you want to go that route.
Having a very similar issue with mine. Might tear into my carbs this weekend as well. Will keep you posted if I learn anything. My guess is pop-off pressure is too high.
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