When I lived in the MidWest 10 years ago, IJSBA JetSki Racing was so much more fun for me than Sportbikes, Autocrossing, and Bracket Racing.
You could take the cylinder head off, change the compression ratio with domes, disassemble your engine and tinker with your two-stroke motor with ease, play with sponsons, impeller pitches, reeds, pipes, scoop grates, etc. Very rarely does one get to immediately see the benefit of elbow grease, and thoughtful experimentation.
#600 is me 30 lbs lighter/10 years younger.
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