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The 140mm pumps need to turn more rpm to make good low speed thrust. Look for an impeller with no more than 1.5" between the blades. If you dont use a grate make sure to fill and radius the grate cutout.

You could install a junk engine and pump, some sucker would gladly pay 3K.

Depends on the previous owner. If he carefully washed and lubed everything after every ride the salt damage would be minimal. In the real world you will have a difficult time finding one thats not garbage.

If its a single carb model I would raise the pilot jet up to an 80 and the main up to a 150. Then power tune the top screw.

Cooler combustion temps will usually leave less buildup on pistons and combustion chambers. Your oil can play a big part in what you see. I would tune it a little rich of peak power and not worry about it.

If its too lean you can slide your hand over the carb and at some level of restriction it will run correctly at full throttle. Kawasaki 650s have weak intake vacuum so larger main jets may be required.

The crossover has been filled. This will increase peak vacuum and allow smaller than stock jets.

Scuppers are great if they actually seal and you never crash. The problem is they often leak and most riders occasionally crash . Will your ski sink? If so, think about possible outcomes.

The Sizzler was made for the 650 Superjet and Waverunner 3. They are shorter and have steeper tapers than Kawasaki 650 pipes. The main chamber sits closer to the engine to compensate for Yamahas wider cylinder. The Sizzler also comes with a standard Kawasaki headpipe that has been factory cut...

Stock Superjets have the lowest octane requirements of any modern PWC. You can use the #7 plugs without worry until the compression is raised and/or a pipe is used. Its rare that I foul a #8 so thats what I use.

Skis are easy to weigh with two cheap bathroom scales.

You can find and fix the leak.

You may lose some throttle response with the mod chamber depending on your pump load.

You will need to cut the carb to make the needles fit and the coupler gap is normal.

Its just another low end couch.

OEM Superjet couplers will occasionally break an ear off, it can make a mess of your mid shaft. I wouldn't use them. We haven't broken a three cylinder coupler yet.

As usual, the previous owner knew how to turn a wrench and burn a piston. It may be okay though as long as the rings aren't stuck in the lands.. Slide the engine forward and spin the pump, it should be smooth and quiet and have some seal drag. If its been out for an impeller change pull the...

Your ski sounds like it could use some work. I inspect and repair everything on every used ski that I actually ride. Most PWC owners have different priorities.

Big engines shake a lot. I would install new N/S and use a gold spring. Larger pilot jets may be required.

If it starts dieseling at idle just go full throttle and pull the lanyard. You can also hit the primer, either way it will stop running. The idle adjustment is super easy to set out of the water.