Riva....
Can you please answer these questions for me. I have gotten mixed responses in my information quest on the 15f.
Can you install the freeflow, powerfilter and possibly remove 1 waterbox without the mitsubishi controller.
What are the upgrades 1 can purchase for this ski without digging into the motor and installing high compression pistons and cams?
Last, depending on these bolt on upgrades, will a bigger pump be a must or can the stock 1 still be utilized? I know I am a pain in the a$$. Thanks in advance.

No worries NJGP1200!

Yes, you can install our Performance Power Filter and Free Flow Exhaust Kit with removing the secondary water box while retaining the stock ECU. You don't need a bigger pump. But, you will will need an aftermarket impeller. I'd recommend going with a Solas Concord 14/20 or 15/21 depending on what type of riding you're doing.

You should consider going with an aftermarket intake grate and ride plate if you're going to do the above modes. They will compliment them making for a more enjoyable ride!

Thanks for the response RIVA.
The parts that you have listed is kinda like then a stage 1 kit. I have a stxr and all i put on it was a 14/20 and it made an improvement on acceleration and actually netted me an extra 1 mph on GPS to bring me to 61+.
The 15/21 slowed the boat down and without a Pet tach or something like that I was unable to verify RPM loss. I am assuming that the 14/20 on the 15f will give same results and maybe since this motor is full of torque it can pull the 15/21 wihtout slop.
Please continue to do R&D on this 15f as I would really like to see some light stage kits like stage 1 & 2. I know it comes to a point where compression has to be bumped to extrude that extra horsepower, but maybe there are some sensors that can be bybassed or tripped to open up some more potential. Im even thining maybe opening up a motorcylcle magazine and looking at performance parts for teh 1200 motor to see where some changes may coexist on this 15f.
Keep us posted as I know you will cause with the removal of the stxr and ultra 150 from the kawisaki fleet I lke many others are starting off with our training wheels trying to learn the 4-stroke capabilities.

Don't worry. Kits for the 15F and possibly 12F are on the agenda for this winter!

Im freaking psyched. I dont think I have been this excited towards the end of a season since after my first year of riding. Im not expecting crazy top speed #'s on glass, but where alot of people ride there is a continous chop ranging 6 inches to 1ft +.
A slightly tweaked 15f could really start being a serious threat in grudgeracing, conditions permitting.
I heard a 15f with the powerfilter on and it screams. Sounds crazy. Cant wait to hear it with the freeflow.

My wife rides our 15F and it kills my GPR out of the hole and can hang with it in the chop. Do a few mods to the 15F and watch out.

...on the flip side, she wouldn't let me mod that one

Jeff

I'm getting excited about next season and ready to bolt on the items discussed in this thread (by-pass, power filter, ride plate and intake grate) My questions to any of you are:

1) Has anyone experienced any backwash problems with the by-pass? or trashed the engine from turning over.

2) I'm generally riding at an altutude of 4-5,000'....what impeller spec would you recommend? I want the best of both worlds; higher top end and great hole shots.

3) Is there a sigificant difference between the stock intake grate and the "recreation" grate? I won't be racing, other than periodic grudge racing. (but I do want to win those few grudge matches )

Thanks for any help!!!

What do you consider a 'by-pass'?

We haven't done much testing with the 15F with mild mods. We're in the process of doing so right now though. However, we're at sea level. You might try contacting Impro's to see what they recommend. I could only guess at this point which wouldn't be very helpful.

Yes, there is a difference in the grates. As you increase speed the stock grate becomes less efficient in regards to hook up. This will actually slow the craft down due to the pump losing traction. An aftermarket grate is designed to load the pump more efficiently improving hook up thus improving performance.

A significant downside to using a stock grate on a modified craft is it's tendency to force the nose of the craft to drop abruptly when you chop the throttle at speed. Depending on which side the craft is leaning you can almost guarantee the craft will veer sharply towards the other.

Thanks for the recommendations. I should have said free flow exhaust kit, which I ordered from you yesterday. Are you aware of any problems that have come up from installing this kit? (flooding the exhaust manifold from slowing down too fast or capsizing, etc.)

My next purchase will be the R&D ride plate and recreation grate.

What is the pitch on the stock empeller? I can't find this info through a search? Thanks for the help.

Joe

Not-a-one! We designed it like the stock system to prevent back-flowing. Note the large bend in the tube.

The end on the right goes to the outlet in the hull and the end on the left goes to the left muffler (waterbox).

I don't have the specs with me for stock pitch on a 15F. The Solas recommendation for a stock craft is a 14/20 or 15/21 depending on your weight (rider & gear) and water type (fresh or salt).

Thanks, you'll be hearing from me soon to purchase plate, grate, and power filter. I contacted Impros to get recommendation on the high altitude impeller spec's as well.

I'll try to post the perfomance results here Mid-Spring. Again, thanks for the help!!

No problem. Please post your results as you go through the process of dialing in your set up so that others at altitude may benefit. Thanks!

Dear all 15F´s lovers,

My stock 15F did 60-61 miles right out of the box.
After R&D ride plate, worx intake and sponsons, some water routing and we have 63-64 miles according to the speedometer on the 15F.
Tried a Solas 14/20 but no improvement.
Great boat !

You might want to consider using a GPS or radar gun to verify your speeds. It's well known the stock speedometer is somewhat off.

some water routing?
what did you change in the water routing?

The water ruting we did was basically stock.
We just changed the waterflow to get a little less water in to the waterbox. We also drilled in the waterbox tho let go of some pressure.
(if you look right in to the waterbox theres only one place to drill.)
If I remember correct we took one of the hoses from the cylinder head that goes to the waterbox and bypassed it right out. Then we moved the hose that goes from the top of the waterbox to the lower inlet were the inlet from cylinder head was earlier, that hose takes the water to the pump box area.
The remaining inlet on the top of the waterbox we plugged.
I will check tomorrow on my 15F if explained right.

And yes, we know thats it´s a big difference on the speedometers, mine show´s 63 and my friends also 15F show´s 65-66 miles, usually it´s lower then you think or hope, thinking of buying a radar gun or GPS.