Thread: WOW Another 90 mph GPR
10-05-2007, 08:19 PM #1
WOW Another 90 mph GPR
This is number 3 built to run over 90 mph. I'm working
on the 4th one now. This one belongs to jetskidaddy. This is
a 1390cc triple built at a lower cost to see what we could
do without breaking the bank. Its a setup that a lot of people
could build within there budget. This unit uses stock oem carbs,
a stock oem head, cut by Group K. It also uses there 87mm pistons.
I have ported the cylinders with a mild port job and I use the
power valves on this setup. This is a 2002 model and uses the FF
plate and runs with or without trim tabs set at 1.00 plus with no
bucking. As before there is no holes or relief valves for the pump
shoe. It also uses one of my modified pump shoes to stop the
high speed buck. It increases your speed and I have information coming
that will show you a big loss in speed if you drill holes in your shoe. This
is if your ski doesn't buck without the need of the holes. Thats all I'm
going to say now about it, but I have back to back video, speed numbers
that I will post in a different article when I can. This video was made
in 90 degree temps in the afternoon this past week. It would probably
gain another 2 or 3 mph in cooler air. The ski was a little overproped, so I'm still fine tuning this boat. With the high demand of the 1390 setup in single and triple setups, I'm trying to find the best combo for speed and acceleration. By winter time we should see some really fast numbers. I
still haven't even tried the VX prop, I know its good for another mph. But
its a high cost item that were trying not to use until we go to that next level. This boat has been very important in testing new ideas and I want
to thank Jeff for the time he has allowed for me to fine tune these setups. I have found that when speed are over 88mph a little more tweaking of
the pump shoe is required and by the video you can tell this boat is rock solid even with a cross wind. As you can see, you haven't seen my boat on video since Mudbug, I have been testing different setups, trying to find the extra HP needed to keep up with the 4 stroke conversion. I think it will
come, but right now I'm just happy to be able to build a customer a boat
that can run the same speeds or faster than my personal boat.
10-05-2007, 08:22 PM #2
10-05-2007, 08:24 PM #3
10-05-2007, 09:44 PM #4
- Join Date
- Apr 2006
- South MS
Congrats Ben, glad to see you posting these videos but I want to see the 90mph+ I know it takes a lot of work to run these speeds. Man I can't wait to get back out on the water.
Questions for you-
What are the peak mph differences you've seen between 1300, 1390, and 90mm ?
How much difference are they in acceleration?
Does this new pump shoe mod hurt holeshot any at all?
10-06-2007, 05:41 PM #5
You were still accellerating when you let off. Need a longer run.
10-07-2007, 12:34 AM #6
10-07-2007, 07:59 AM #7
dang thats fast! I think jeffs ski will be the fastest in the houston area
10-07-2007, 09:28 AM #8
Sounds like Jeff will be the "mac-daddy" now.
10-08-2007, 11:27 PM #9
- Join Date
- Jan 2006
- Rydal, Georgia U S A
Glad you got the ski running fast. 90 mph wow.
10-14-2007, 09:26 PM #10
- Join Date
- Apr 2005
Very Nice Work Ben. I Think My Ski Is Getting Fast Until I See Bens Magic Then I Start To Cry.=p~ Todd
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