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The carbs are flowing enough air before they are fully open. A pair of 46s would make full power by 1/2 throttle on your application.

Holey sheep:-):-):-):-) Batman.

They didnt save as much on Kawasakis, about an ounce. Two ounces for 701 Yamahas. Pro-lites came out 20 years ago, they expanded a lot and skirts didnt hold up well. They are fine with plenty of clearance and a working rev limiter. Wiseco stopped making them, their current pistons are just as...

If it never wears in then it will never wear out, right? These engines last 100-300 hours if you're lucky, there is plenty of wear going on. Its not like a tractor or airplane that has to run full throttle for 40 hrs just to seat the rings, their cylinders can last over 5000 hrs.

Retune the top screws if you do any full speed runs.

It is difficult for cooling system water to get inside the engine without having a hole between the transfer port and water jacket. In any case have a significant maintenance budget if you want to stay in the hobby for very long. Most owners abuse and neglect their toys once the new wears off.

Depends on how tight the pistons are fitted. Carefully control the heat if too tight. Go directly to the races if too loose.

A 750 pump sets the prop back about 5MM compared to a 650 pump. This sets the driveshaft spacing of 750 prop/pump only slightly more forward than a 650 pump/prop. If your only goal to to go fast on glass use the Kawasaki setup. A proper Yamaha setup is much more efficient from 0-20mph for a...

That was one nasty porno.

The 144 will make more low speed thrust IF the whole inlet is changed. Its a lot of work without previous composite experience. The Kasasaki swap is easier and works about as well with the small FX1 inlet.

Well, .1MM = .004". Thats not bad for a used engine.

Install a 95g spring and 120 pilot. This should still be a little rich at part throttle. If you do more cruising than throttle blipping then use a 115g spring.

You can clean up 1/4 throttle by dropping the pilot but throttle response will get sluggish. Any aftermarket pipe need to sputter a little at 1/4 throttle for good response. The bottom screw is for idle only, the pilot is for 1/4 throttle. Installing a 115 gram spring will make both leaner...

They tune the same. Single carb Kawasaki applications can use lower popoff pressure.

Can you be more specific about your problems? The only problems that I found with Kawasakis have been crank failures in race boats. A low port kawasaki is very similar to a Yamaha in a given hull/pump.

Spend time developing something that is not readily available.

:veryhappy: Too easy.

From an engineering point of view, it wouldnt be very difficult at all. Install the same engine/pump combo that the backflip crowd is using and cut 18 inches off the back of an X2. A full length standup will struggle to get all the way around and they are effectively 8" shorter than an X2.

How about an accurate planform drawing next to a Superjet for comparison. Hull area aft of the CG is a critical consideration for larger riders. What about lateral grip: more or less? Any tendency to hunt in a straight line? Built in tubbies?, if so does it tend to chine walk?

Tap and plug the top and middle inner holes with 4-40 screws. Make sure the bottom hole is no larger than .050". Then bleed off the head pipe pressure with a pisser and it will be perfect. Leave the pipe at its max power setting and tune the pump to match. FPPs top and middle screws are...