I have a 1990 kawasaki jet ski that gets hot. the engine was rebuilt. what could be wrong?

They are here

http://www.theskiclinic.com/kawasaki-tech.html

Or do you mean engine torque as related to horsepower?
Maximum Torque 152 N·m (15.5 kgf·m, 112.1 ft·lb) @7 250 r/min (rpm)


https://www.google.com/search?q=2011+Kawasaki+Ultra+Jet+Ski.+Torque+specs

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Your carburator bowl float is stuck in open position, or it is sticking allowing the gas to flood the engine.
Remove the carburator boal and try to clean or replace the carburator bowl float.

is the engine and exhaust hot when this happens ?
if not then have the heat sencers checked , if yes then check thermostat and cooling hoses for blockages !

kawasaki ultra 260's are only cooled by lake or sea water so if the water supply gets blocked then it will overheat ! did it definatly overheat or just loose power because the superchargers do sieze up due to damp air or the pully bearing , also the dipsticks on them sometimes shear off and lock the cogs ! does the engine still run up on a hose pipe ? also has the ski been left a long time not used without fogging the valves in the head ? this is my job so get back to me ( 30 yrs ) ..

compression check , 100psi or more ! battery and connections good ?

I am sorry but you have this posted in the wrong product category. Please post it in the correct section.

Stock needle settings are: LOW 3/4 +/- 1/4 . HIGH 1 1/4 +/- 1/4

my kawasaki 900 stx got no spark to plugs what could be wrong thanks

You must take out completely the carbs and clean them especially their canisters with the flowters.They may have jelled gas inside or closed air pipes.Use a carb cleaner spray and compressed air.