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Only $4500 for a backflip?

Its all from a riders perspective as to how the engine responds to throttle input. Our skis are not connected to anything solid like a car. Thrust occurs only when the engine is at high power/rpm. ANY power that the engine makes below stall rpm is felt as response more so than thrust. Low port...

Whoever decided to purdy up those carb throats destroyed the jetting reference. The whole tuning process will need to be performed. This is much tougher with twin carbs that may end up needing different settings from one another.

If you end up with a small #main than pilot it just means that the carb has very good full throttle signal and part throttle is plenty rich. Trying to predict what will work is a fools game. Go through the tuning process and your engine will tell you what it needs.

The sled engines are tuned for more rpm than our pumps can handle. Lower operating rpm is why pwcs cant post as large HP numbers. We try to make up the difference with larger displacement engines.

What would it rev on a low port engine?

The owner of Killacycle (the 7 sec electric drag bike) told me that A123 batteries are half the weight of the best AGM. You would be looking at $200+ and need the proper charging system for a 4-5LB battery. More weight may be saved if you skimped on capacity. I could not find any nicad cells...

I used some clear epoxy sold on ebay called Max-CLR. It works just like paint, just roll it on and it will gloss, no blush or fish-eye.

Pump load should be high on the list of priorities. Missing the power bubble will undo a lot of $$$$$ worth of engine mods. Big engine guys have it easy because they can pull anything in a 144 pump. Small engine guys need to put in the time if they want a really good running boat.

You need lower pump load than with a 61x cyl to get the rpms up. I would bore the nozzle as much as practical and get a concord pitched down to 13/16 or one of those 9-15 hookers. I have tested both styles of nozzles up to 85mm with no ill effects. The rev limit will need to be raised a little.

Yep, pumps are just another meaningless name and number to the average jetskier, just like carburetors. Popularity is all that counts, this is a world where perception is reality. Its mainly because most participants are young and/or only interested in riding. Most tech guys are old.

I dont see a problem with a vacuum unless you are really dumb and try to clean up straight gas. Leaving the hood propped up just 1/2" will evaporate about a quart of water in a week depending on the humidity.

An unmodified 750-800 prop will require the pump set slightly further aft than with a 650 prop. A 750 pump wont need as much setback as a 650 pump. Im just saying set it up for 750 props unless you want to do machine work on every prop. Useing a 650 prop leaves exposed splines that will get...

Set the mounting distance to use 750-800 props. They will use and seal the driveshaft splines. Plus there are modern props available. Concords for 750s were relatively low pitched.

I made this one, the steering is 12" aft which puts my feet near the edge of the footwells. Still more nose heavy than a standup so planing is no problem. The ride is much smoother and drier. The nose stays up when jumping and there are no painful landings. With a little power it will easily...

If you like a chopped hull try one of these.

The key to good storage is in getting all the water out and starting it every month or two to keep the carbs in shape. I have found corrosion to be the number one issue with skis because the owners store them wet and never do a lengthy blow out. Any water in the tank will end up sitting in the...

I was refering to the lack of a middle class.

Where did you find a pump that hooks up at 9000rpm?

Do not play with oversized carbs until you have absolutely mastersd your stock carb.