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Everything will swap except the exhaust, driveshaft, and e-box housing.

Most pumps dont have enough surface area for silicone sealant to hold up to binding hoses and side landings. Try something a little stiffer like urethane, pro-seal, 5200 or 3-bond. Urethane and pro-seal are by far the best. I still find lots of glued in pumps with broken bases. Use a bracket and...

That impeller is the problem. A Waveraider 760 is about the only place for a Solas "J". Clamp it in a soft jaw vise and hammer the trailing edge up and the leading edge down until they are 1.3" apart. This should unleash at least 20HP.

Why are watercraft carbs known only by a name and throttle plate size? Never any mention of venturi area.

Then be ready to spend twice the money up front.

Not the same. A 155 steer nozzle will work on a Superjet nozzle with spacers and longer bolts.

There are too many possible causes, find a local tuner for help. A small exhaust leak can cause your problem.

Plus added corrosion and expensive glycol or castor oil. Setups should probably be developed for the big spenders but then they would want methanol and nitro.

Get a shorter handle pole.

Rider weight wont infuence the thrust that an engine/pump is producing. Ideally, you need an RPM target and a tach. A seat of the pants method is noting how quickly the pipe hits from idle. Any lag indicates too much load. Even a pump gas 62T cylinder can go from idle to full thrust in less than...

You want to set the pump load for maximum static thrust. That requires the engine to reach peak HP rpm in a tail stand. The best top speed/rough water load will be about 100-200rpm below this.

Yep, and they will be printing more dollars soon.

Boring the nozzle will make more low speed thrust, especially if overproped to begin with. Small hub Concords work well once they are flattened out, that was yesterdays prop so find a used one that has already been modified. If you are going to buy a new impeller get a Hooker 9-15. The only way...

I thought the R1 was easier to ride.

Is anyone surprised? Some people (doctors and lawyers) do the same thing with $100k airplanes.

Yes, the 650 has as much trapped volume as a 701 because of its lower exhaust port. Its off idle response is about as good, just runs out of power sooner. This is why the same low pitched impeller will work for 650-760 engines. The 650 will run out in the low 6000s where as a 760 may hit 7000...

Yes, but it will also affect the idle and pilot mixture noticeably. It wont change the main very much.

Watercraft carbs use a demand regulator instesd of a float bowl. Popoff is how we measure the pressure required to open the regulator. Lower popoff means it lets fuel flow sooner making the mixture richer at part throttle.

Probably not, lowering it will make the mixture from idle to 1/2 throttle richer if needed. Try it with stock popoff first.

The 750 carb is way too lean for 650 use. Install an 82 pilot and 160 main. Clip one coil off the spring if it doesnt sputter at 1/4 throttle. Smaller main jet will be ok just open the top screw more.