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Need some guru help... I have a 1990 Kawasaki X2 (X-2) with 1995 ZXI 750 motor with west coast header, waterbox, and vortex spark arrestors. Also, aftermarket ride plate and intake grate. The ski seems to be flattening out top speed, 3/4 throttle to full, no real top speed improvement. I believe it has the stock X2 impeller, aluminum. I purchased this about a month ago barely running. Cleaned and tuned the carbs, but still just looking for a little more out of her. Was wondering if anybody has a suggestion or similar situation with a good impeller combo maybe from a SX conversion?? Looking for the best all around combo. Thanks. The previous owner said the motor is from SBT so please don't boot the thread. Thanks