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Use the longer chamber then bore the nozzle/flatten the prop if it doesn't respond quick enough.

Bigger is better as far as peak thrust is concerned. The whole pump inlet needs to be as wide as the pumps diameter and the nozzle also needs to grow with everything else. A solas 144 stator will load a wet piped 701-760 very well. Going larger benefits larger engines more.

You wouldn't use an O2 sensor in this application. A thermocouple may not provide much feedback without a lot of full throttle use. It would most likely use a fixed map with temp and possibly a barometer for atmospheric adjustment. .Dont get too excited about EFI on our type of skis. It adds...

Ive had good luck with gear lube on throttle cables, makes them feel new for a few rides. Ive never experienced steering cables getting stiff though.

How do you get the backward piped waterbox to drain?

What is your height and weight? Small riders may want to mount them a little higher so they dont grab in straight line runs.

The rear of the engine moves more than the front because there's less dead weight back there. Ive always been able to use the strongest springs on dual carb applications with good results.

Does it rev up out of the water? if so its not the limp mode.

I have met an old guy who converted his backflip ski to fixed steer because it was too uncomfortable. He can still flip it, this may be something that could expand the sport a little.

Seven years is a long time for any kind of battery. LIPOs have been available for 20 years, does that make them "old" tech? They still have the best power/weight and are now cheap. LIPOs do occasionally burst into flames just like expensive freestyle skis occasionally sink and get lost forever...

Last year I restored a 650sx and now have a new group of kids learning to ride it. Whats old is new for these guys.

Its a lot easier to make thrust at lower pressures. Thats why I suggested larger pumps a long time ago.

Yes, especially if they never done it before !!!!

We ask a lot from these batteries. Lithium-ion should not be less than 1/2 the weight of lead. They would be a lot more durable if they were 5 or 6 pounds instead of 3. Plus their packaging is not designed for underwater use. LIPO batts can be reliable at 1/4 the weight of lead. Those need to...

Big hub props provide most of the improvement, mag stators are icing on the cake. The Jetski world is better than ever, but prices have pushed away the masses. Plus the participant turnover rate is just slightly lower than for skateboards or BMX.. I have noticed that people will spend big bucks...

Sure, first he needs to make sure the pump isn't overloading the engine. Lots of people used too much prop thinking they would go faster. Then he needs to learn how to tune a 44 because its easier. Otherwise he may end up being one of the thousands online posting "What jets do I use ?"

Yes, a little bit. The demand regulator does a good job but the return line will give the effect of changing pop-off pressure during acceleration. Similar to hard turning couches needing their carbs turned sideways.

Our carbs work with low pressure on the pump side. With the fuel source behind the carbs, any forward acceleration lowers pressure and the return line can make it worse. Im not saying it cant be made to work. It will however lean the carb mixture when you hit the gas.

Smaller inlet will mostly hurt low speed performance. Use a deep scoop grate on a 550 hull with 750 pump.

Rear tanks are great for fuel injection. They cause carbs to go lean under acceleration.