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You most likely pushed some sand into the midshaft when the pump was reinstalled. The driveshaft tunnel is always full of sandy grease. The only way to insure the splines will last is by removing and cleaning the midshaft/tunnel every time the pump is removed. Aligning the engine also helps.

Get your nozzle bored and make sure the rpm is at least 7000.

Contition is the most important aspect of old skis. Problem with old skis is that they are pretty much all junk condition wise. The only good/old ski is one that was never owned or operated by a typical jetskier. Stock Superjets are not fit for riding without a pipe, prop, grate, and port work...

Tune your engine to make as much power as possible and tune your pump to hold the engine at that rpm. All the other parts wont do you much good if you cant master this concept. The outlined setup should have good throttle response but be limited on power and thrust.

You will never get that Westcoast head to seal, especially larger bore sizes. Use a stock SXR head with that low port cylinder.

Opinion wise, nobody here likes them very much. They're an OK starter ski as long at its dirt cheap. At the time I liked them better than a SN on smooth water because they carve so well and were challenging to ride at full speed. 1996 model had the old hull with the best engine. Not very...

NASA engineers must have designed the old Polaris waterbox.

Carbon fiber wont work on aluminum. Epoxy and glass is very good for repairing thin aluminum. Make a mount with EVA floor foam and superglue.

That is how stock couplers break. Your 64X-65V 760 style seal wear ring slipped off which is also common. Install the new one with some loctite.

Old farts and obnoxious young males never mix well. Unfortunately the former has more credibility, time, and money so they will automatically win a nuisance complaint. I dont understand why anyone would even ride a lour ski much less make one so. I think this is why we use to have big wars, they...

Reinstall the stock waterbox.

It is usually the stator and wires that fail.

If its in good shape and runs well (and has a title) then its the cheapest/best way to get your feet wet compared to a 440-550. Everyone here has Superjets and wants to do flips, so they will say save up and buy whatever they have.

Drilling the main jet is fine for single carb applications when you are going to power tune the top screw anyway. It is not so good for twin carbs where you are relying on both being as close as possible.

There is a little more to it than that. Move the steering aft, shorten the hull, and add a lot of power with a trim nozzle. Bigger waves will make up for lack of power.

Wouldnt it be better to get the rpm up instead. Its hard to make more thrust at less rpm.

All things that take a time to develop. Thats why most skis, like dirtbikes, are in such poor condition after a few seasons.

Bend your concord a little and it will hit even harder. The 62T cyl makes less power from idle until the pipe starts working (4500 rpm). This is only felt as response since little thrust is made at low rpm. A 62T makes more power and thrust on the pipe. People have problems with high port...

It is all in your head. Get a pipe and a good impeller, that will make a measureable difference. Everyone thinks louder is faster, even when its not. Now go drill your box.

A feisty young man. These old guys are just saying "Hey kid, you'll put your eye out". BTW get a better impeller.