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Time to pull the rotary cover.

Yes, sand in the water jackets is normal.

Rust will pit the rings and cylinder walls. If it was mine and I was going to keep it, new top end. If you just want to see if it will run then have at it but know that if it lets go it will be more expensive if it takes parts with it. You also need a full rebuild of the fuel system no matter...

We need to establish if it actually a DESS model first. But yes, crossing all the wires could have shorted out the MPEM but lets not get ahead of ourselves.

I would avoid any "injector cleaner" in a 2-stroke. Do it correctly and send the fuel and air injectors out for professional cleaning. @etemplet has an injector guy. First step is always fresh fuel and sparkplugs.

It is also a path for the exhaust to escape so there could be a blockage in the exhaust system.

There is no way to get sand into the pistons.... Also if it turns one direction then "Catches" is is typically a rotary valve issue, I would pull the carbs and rotary cover and make sure nothing is jammed in the rotary valve like an air cleaner bolt (very common).

You will still have some play in the crank even if the pistons are seized. Rust in any of the cylinders is not a good sign. #1 was this ski used in salt or freshwater? If it was freshwater, I would pull the head and have a look but you will need new o-rings.

99.9% of the time a rusted engine is broken free the damage is done and the pistons and rings will finish themselves off when/if you get it to fire. If it has been sitting you also need to do a full fuel system rebuilt.

Just make sure the water is only ever on with the engine running. Never Ever have the water hose ON and the engine OFF.

Very clean! Great little ski.

1995 GTX does not have DESS. Also a 1995 GTX has a 650 engine not 720. Last two digits of the VIN will be the correct model year.

That is the correct installation.

The RFI (Rotax Fuel Injection ) Spot This thread will give you the filter numbers available at any auto parts store. No, the fuel lines on the injected skis are not TEMPO and do not need to be replaced.

BUDS is only available at dealers unless you find one being sold used on the gray market.

Compression is fine at this point, perfect on a 951 is 130 psi. #1. Get those carbs rebuilt correctly. Also look at the oil since it looks green/blue which is typically not the correct API-TC full synthetic.

Use some fogging oil or 2-stroke oil to lube the cylinders, not PB Blaster. Yes, it is fuel injected and oil injected. You do not change the oil like on a 4-stroke. The orange lugs ae for grounding the sparkplug wires when cranking it over without the sparkplugs in. Yes, rear PTO (Flywheel)...

Don't get hung up on pop-off as it is a test and not how the engine runs. Make sure you have the correct needle and seat, spring and new arms with pivots and pop-off should be within spec. No, the 80 gram spring that is not in the kits is for the 787 engines, not for the 951/947. That chart...

OSD Seadoo has all the carb parts you need. OSD Back To OEM Sea Doo Dual Carb Rebuild Kit (ALL 947) [OSD1273] - $144.99

There is only one 951 DI. Never hear of a Di Le?