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what does the air box lol like? Any restriction there will make it richer. It's also possible that they made up the difference with the top adjustment screw.

I never thought that it was adequately served by the stock oil passages. I extend the stock passage to assure the bearing hole is not covered and cut a channel to the front side with a 1/8" ball file.

I extend an oil passage in front of the bearing.

Skat never made castings for ultra low 155 impellers. This is what they look like when you bend them for 701 use.

It was a lot easier when there were only two large providers. Now there are dozens of small shops and many hulls are using existing HIN#.

You heard right, the 12-18 is too much for 701. They work fine once the blades have been adjusted.

I think it would if the return line was full.

Bad idea, how do you keep carbs from going lean on acceleration? A header tank would have to be mounted in front of the engine to keep a head on the carbs.

The key to corrosion prevention is in drying out all moisture. Most PWC owners fail miserably at this. Leaving the hood propped open just a 1/4" will dry out the interior after a few days, you can close it after its completely dry. The engine and exhaust need a couple of long dry runs in order...

Your peak rpm is limited by the stock 61x cylinder, the exhaust port is too small. Plus the full throttle mixture (top screw) may be a little rich. A little port work or a 62T cyl leaned to peak will turn 6900+.

The inlet stream will be moving around 25mph. A heavy couch gets good pressure recovery but a standup pump runs higher so it's not as efficient. If we had rpm reduction units that allowed the use of 10" pumps nobody would be able to hold onto a ski.

The idea is to prevent flow separation at the leading edge when head pressure is low. We want water to stick to the blades as much as possible when it not being force fed. A steep prop will work fine once underway but tend to vibrate out of the hole and in adverse conditions. A bigger pump with...

I always measure it. I never found any corration between published and actual pitch at the leading edge. All modern props are cambered so we don't need two numbers. It just causes confusion. Don't worry about the leading edge too much, every new prop is flat enough except for dynaflys. They...

Flatter leading edges improve hookup at low hull speeds. Steeper leading edges work a little better at high speeds. Props willl run smooth as long as the L/E is not much over 10 degrees. They start getting crunchy after that. More power and rpm make is worse.

The aft two inches is where all the water ends up and is where all the load comes from.

All this makes me want to run a stub pipe.

It's hard to hear over the intake and exhaust noise. At full power it will sound like a high pitch buzz for about three seconds, then the engine will shut down with a stuck ring.

I think you drowned your pipe.

Lets recap, engine/pipe builders hate posting dyno results because; big numbers are easy to attain but impossible to apply to a water pump and few consumers are accomplished enough to understand this.

Porting and pipe specs that make skis run good will make a bike hard to ride. Much of the bike work went into increasing breadth more than intensity. Water pumps dont cooperate with high intensity pipes. You will put in a lot of hours trying to get exceptionally high BMEP at 7000 without soft...