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A long stroke 900 is almost as expensive as a 1100 to produce. People want the most for their money. For taming a full power 1100 try backing off ignition timing and install a smaller pump nozzle. This will lower heat and rpm for improved engine life while smoothing out the power delivery for surf.

How can it have a cooling problem? Kawi 650s are the coolest skis ever.

12 vane stators use shorter blades than stock 6 vane stators. Since they are made to mount in existing hulls, we end up with extra space inside the pump that holds more air. It is this trapped air that expands and blows water out of both ends whenever the inlet flow is interrupted which hurts...

Bend the leading edge down a little, it will run a lot smoother. I never found impeller/stator clearance to make much difference, nozzle size and blade angle are huge by comparrison.

Do you have a cambered impeller or straight pitch? A straight pitch behind a 750 will vibrate a lot at low speeds so use a good grate. The blade to stator distance gets too much attention considering what it does for performance.

Wow, that means my 200HP 1100 will make 230HP!!!

Make sure the shaft tunnel is clean, they tend to hold sand, it will get on the splines and ruin the mid shaft.

The case will be a deal breaker for most. If all the parts are very low time, it is worth keeping.

It will run better, but you will also burn a piston sooner or later so leave ignition timing stock.

A larger pump has higher flow capacity, this is more efficient for making thrust at lower speeds than increasing pressure. Plus it allows lower blade angles for a given load which improves hookup over a smaller pump with steeper blades. Hub diameters also need to grow but Skat will wait until...

It is easy to make great power with that timing. For smaller engines, getting good response with pump gas and stock ignitions can be very challenging. I always end up flattening out an impeller.

It comes from Yamahas marketing department. Peak power is limited by the small 61X exhaust port. You can find magazine reviews of 95 and 96 Blasters, they have identical pumps and go the same speed despite the 96 claiming 10 more HP. 62T cases get better with mods but dont do much for stock...

All kids are idiots, except for mine.

You will want to get a turn plate and short pad to keep it from porpoising so much, even if the rest is stock. But first Im sure that your 22Y/O ski needs a full round of maintenance for reliability.

Yes, this is where the 155 pumps start working well.

Power made before 4500 follows displacement very closely for a given port height. On a ski this is throttle response only. Between 20%-30% of the power and thrust comes directly from the pipe, more so with higher ports.

You can stick a pitot tube in the jetstream and then compare RPM and pressure with static thrust. Then do some top speed runs and formulate your own performance equivalents. The data wouldn't mean much to anyone else, but this is a cheap way to keep notes on what is actually happening. All this...

I "actually" think the large hub is displacing an air pocket and "in my opinion", water is hard to compress.

For street cred, try pulling your ski with a bouncing 64 Impala.

You can bend the old 10-18 and make it pull a lot better but it wont have the hookup that a large hub has. If you ride in anything but glass, you need a large hub impeller.