1996 Waveraider 700 sat in lake for over 4 years. Impeller (stock) was extremely pitted from the corrosion, couldn't even get it off the shaft. Ground the blades as best I could under circumstances to smooth them a little, but they are still rough. Took down the edges (sides and leading, but couldn't get to the trailing edges, which are very rough, like chewed up) so it would spin free in the housing, which it had grown into.

Is this a dangerous condition (to the engine or rider) if I take it out and run it on the water to make sure everything else works before investing in a new impeller and shaft? Or will it just not go very fast? What should I be on the lookout for - cavitation, etc?

And does anyone have any tips on how I might get this impeller off the shaft? It's like it was welded on there...