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Jet skis seldom get cared for so finding an old one without a rusty engine is difficult. Don’t pay much for one unless you can see and inspect the unit. If it doesn’t look like new under the hood, discount the price by $1500. That’s what a new OEM crank and fresh bore will cost.

He’s probably still in the hobby. LOL.

As I have read, the Amanda was made by AJS in England. The demographics at the time did not favor this type of vehicle. England and Europe were very poor after the war. In the USA people bought boats that could fit the whole family. The Jetski was a lifestyle accessory sold in motorcycle shops...

An widened port will help performance and still last long enough for the demo. I would hate to warranty a freestyle engine. The engine builders have to back off compression and timing unless they trust kids to buy expensive fuel. Our performance expectations are probably too high for a turn key...

In my experience there is a very large spread in how hard a ski will pull based on its apparent mods. Thats why I said it needs to be enough to be tiring. That is always subjective. I suppose some guys would need the very hottest dry piped 1200 with a big pump.

In my opinion, an early SJ needs enough pull so it tends to wear you out. Basically as much as you can get from a ported OEM cylinder with a pipe and low pitched impeller. They can do this much easier than old Kawasakis can mainly because of their larger pump.

The old boats are more difficult to stay on top of. That makes them interesting to ride again, just like they were over 30 years ago. Superjets need a lot of power, A/M hulls need even more power than that. An SXR 1500 need to be going 60 before its as exiting as getting out of bed. A new 12'...

I recently got back on a 650sx and a 750sx. I took some time to get my sense of balance back after riding Superjets and a Rickter. The "better" hulls will make you lazy.

It will bolt on. Expect throttle response to be better and power to be lower.

Im sure their decision was swayed by the million 701s out there that they could support at the same time.

Two-strokes run into thermal problems with large bores. We can get by with them on a freestyle application. Couch racers had a difficult time keeping 80-82mm pistons from burning up at 7500 rpm. Remember that our big twins only work with big pumps since they cant turn as much rpm. Using...

Anyone that can bore a cylinder can make an 800. An A/M power valve cyl is more difficult. They didn’t seem to sell enough of those to make it a lucrative business.

We already have that in abundance. There is more money in 1200+ engines. Plus its easier to reduce power on a large one than it is to add power to a small one.

Keihin made a good 38 and 42 for the aftermarket in the early to mid 90s. They didnt sell as well as the Mikuni 44 and 46 so keihin dropped out. Kawasaki used Keihin as an OEM carb through the mid 90s. There is nothing wrong with a pair of OEM Keihins on a 750 except for the price of repair parts.

That nipple is where oil is injected. Switching to pre-mix wont change jetting requirements on these carbs. They have an internal spring loaded ball to prevent air from entering but the nipples should also be capped when not in use. Keihins had a plastic cover/limiter pressed on the low and high...

Quality cannot be assumed anymore. Buyers would benefit greatly if they learned about materials and manufacturing process. Then they could demand good stuff instead of just pretty stuff.

Watercraft engines are allowed to shake a lot, plus they get rolled over and have no place for all that fuel in the bowl to go. Watercraft carbs require the engine to be turning before fuel can flow. If they were testing for max BMEP a simple fuel injection system would be easy to utilize...

A carb with a float wont work on a watercraft since the engine is soft mounted. Slide carbs meter fuel much more accurately at part throttle making them better for wheeled vehicles and dyno work. There is not much left to learn about engine and pipe development beyond the application aspect...

How do you get the top ski loaded? Is that black thing a crane?

It takes an overly rich mixture at idle and pilot for best response from low rpms. We have no accelerator pump so having a rich mixture is needed because it temporarily goes lean when you quickly pull the throttle open. Stepping up your pilots one size and opening the low screw a little will...