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That depends on which 9-15 you have. A Solas would be way too much, a Hooker may be on the light side. Besides all that, the port height and pipe combo are huge factors. It is much more difficult to get a high rpm setup to spool up fast. Often freestyle impellers end up on the lite side of...

Some people disagree by spewing excrement. Its difficult to understand exactly why but at minimum you know they are unhappy.

IMHO, 1K would be a lot for everything in the picture.

Lacking bottom end? The "b" pipe tends to have longer tuning than the wrap around styles so your problem may get worse. I would look to the pump first, a tiny little impeller bend can make a huge difference.

Or you can build a fixture that holds everything stable. It goes along with all the other good maintenance practices that most fail to accomplish.

How do you ride? A big nozzle will make it pull harder. Don't expect much from a cone. Leave the head stock if you jump the temp sensor. Lighten the flywheel last, the ignition advance may be enough.

I'm new to the art of sales and marketing. I still don't see how anyone can make a highly informed decision based on the ads I have found. They remind me of old Pontiac commercials. That video just made the 1/4 ton SXR as "awesome" as the Superjet was a few years ago, that is if the same...

The whole idea of having the impellers trailing edge right against the stator was something IMPROS was selling years ago. The impeller MFG may only cast one or two different pitches of a particular product. The blades are bent to get the correct load. My hardest pulling 144 Solas looks like...

Okay.... The greatest variance between A/M hulls is their length from the center of gravity to the rear edge. Width of the bottom is closer, its easy to measure and should also be noted. Driveshaft length???? The way they turn is difficult to measure and will always be subjective. Riders...

No 80s Kawasakis???

Actually its a venn diagram. I would rather see the hull names with bottom dimensions attached.

750s have much more powerful charging systems. Im not sure how hot the rectifier gets. I mounted it on the outside front of my homemade box.

The plastic ones never wore out.

What are you trying to do? I have installed different brand electronics in existing E-boxes and once made a form fitting fiberglass box to replace an X2 oil tank.

I can't feel any difference but I would use the stock stuffers with the stock manifold or one that has the same size hole.

Full throttle mixture must be set rich of peak power and the ignition timing retarded well below the detonation threshold. Ive burned a piston on a 92 octane Superjet by letting the tank get low and running full throttle. This engine was 81mm, 165psi, and 21 degrees advance. A separate header...

The ROK is short and has a lot of lateral grip. Most A/M hulls are short, and slippery like your 650. Hulls that were strictly setup for back flips will typically be uncomfortable to ride planed out at higher speeds. You can make a bit of a hybrid by changing where you stand and handle pole...

WOW, it lasted 5 years with that kind of maintenance!

Nobody can know what your optimal full throttle setting will be. Get a tachometer and find some smooth water.

Its possible the kit came with stiffer needle springs. If so, the popoff will be higher and make the idle mixture and pilot jets noticeably leaner. You may be able to clip the springs and be back in business. Or install the next size pilot and open the lower screw. The top adjustment screw...