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They say idle hands are the devils playground. See there, if your ski wasn't always sinking you would be out looking for trouble!

I know it wouldn't be popular but what I said was absolutely true. I have restricted exhaust outlets until they whistled without losing any speed. This only works with tuned pipes though. A stock Superjet exhaust would lose power. And it is extremely rare to find a jetskier in the hobby for...

They used Superjet powerplants, those exhausts have no tuning so they need low port cylinders.

The sad part of all this is that a twostroke with a tuned pipe can be made almost silent without losing any power. All these loud freestyle skis are that way because the owner "wants" it loud. It does show a lack of maturity. Fortunately jetskiers can never stick with the hobby very long and...

The WR3 is the same engine as your Superjet except with a single carb. Performance will be very similar. A 760 or 62T 701 have higher ports and need a tuned pipe to work any better.

I have heard that from stock SN waterboxes when the engine was revved out of the water. It was only at high rpms though. Apparently the sheet metal baffling is resonating.

The whole "reverse jetting" phenomenon occurs easily on mikuni 44 and larger carbs although it makes them very rich around 1/4 throttle.. The main reason it works at all is because many standup riders fan the trigger and racers never spend much time there. Trying it on a 38 means doubling the...

I bolt the cases together clean and dry and measure the bores, then compare that to the bearings. I want to see some interference.

It seems like people get too old for skis before they are able to say "Oops I was wrong" about anything..

Thats fretting, they all do if the bearing is able to move in its bore. I measure the holes before assembly and surface the halves on a lapping plate to make sure they're tight. Then I use strong loctite on the bearing to case and have never had any fretting. All these cases are ruined by...

Use a stock box!

So do I, but that part doesn’t matter. Getting the load right is extremely important but few riders seem to realize it. Impros made it a simple item on the list for superjet riders many years ago. Kawasaki guys never had it that easy so those skis got a bad rep for having no “ low end”.

Up front above the rail will work and is easy. Rear exit is a lot of work.

You said it!

Well, okay. You cant change the root angle but you can make any 30 year old straight pitch small hub work a lot better by bending the outside edges into a camber. It is impossible for the root to propel water aft because its moving slower than the jet stream. Someone finally thought of filling...

On small hubs root angle is never a problem, large hubs it can limit your ability to make drastic changes. The impeller is moving too slow at the root to contribute to anything other than pushing water outwards. Large hubs just fill a dead space and prevent water from recirculating back under...

Originally blades were pitched in a straight line from the leading edge back. In the early 90s they figured out making the leading edge flatter made them run smoother and prime better at low speeds. The actual numbers assigned to an impeller are meaningless as a load indicator unless you...

Almost no people are perfectly average, half are above and the other half below. Using standard deviations will place the majority near the mid point with a few really smart and dumb ones at the ends. There's a book called "The bell curve" that demonstrates the phenomenom very well.

Thats a lot of load and it can really wreck performance. I have been working on a high port 750 with a Superjet B pipe. It needs to be reliable for the kids so it got a stock head. This combination required a much flatter impeller than I ever imagined. Nearly 1" between blades!

Adjusting the pump load to the engine takes some practice but is critical for good performance. It’s also very easy to melt a piston if rpm is too low.