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A new impeller, intake grate, ride plate, and pump seal kit would be about all you could do for $500 to the pump system (actually, I'm not sure that $500 would cover it). That may gain you 1-2 mph. Unfortunately each 1 mph gain in speed is expensive on skis.


You could go for a Stage 1 kit from RIVA or R&D which has the above plus modifications to the engine, exhaust, etc. that would give you 4-5 mph but more $$$:
Riva Kit: RIVA Racing Yamaha GP1200R Stage 1 Kit
R&D Kit: R&D - Performance Kits - Yamaha - GP 1200R - Stage 1 Kit
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