FWIW.....if you went through the trouble of cleaning the carb, you should have just rebuilt the whole thing....you MUST use genuine MIKUNI carb kits (all other kits are a waste of time and money). Follow the carb rebuild sticky post at the top of the forum....like gospel ALL the way through.
I assume you removed any old fuel and started with fresh new fuel? The fuel selector switch is in the ON position?
You don't mention if the ski has all the original grey tempo fuel lines, etc....SO, conventional wisdom states: 1) replace all fuel lines, 2) replace the fuel selector switch and fuel filter O-ring gasket too (they don't clean and they are cheap enough), 3) rebuild the carb(s), 4) replace (or fix) the fuel guage - IF yours is broke 5) re-sync the cable connection(s) to the oil pump (assuming the pump hasn't been bypassed to run only pre-mix, 6) test on the trailer on the hose - short periods of runtime only (the hose water does not cool the driveline components) - 3000 rpm at idle on the trailer.
Drop it in the water and she what she does then - idle is 1500 in water. Good luck with it.