Thread: 2 inch pump extension
04-26-2007, 12:39 AM #1
2 inch pump extension
i have a gp1200r 2002 model it has a 1300 motor in it and the 05 pump.
just one qeustion is it worth doing the 2 inch ex , and do you gain any more topend ,
i wont lose any speed will i
any help would be great guys
04-26-2007, 03:05 AM #2
Better handling and hook up and maybe good for .5 to 1mph.
04-26-2007, 03:43 AM #3
sounds good might look in to it
04-26-2007, 06:44 AM #4
Carl at Island Racing should have a kit for sale.
(get a prop while your there)
04-26-2007, 09:19 AM #5
I just did the '05 pump with the 2" extension on my '02 GPR. I got everything from Carl, fully assembled. The extension is certainly a lot more expensive because of the required driveshaft. But, I immediately noticed a more planted feel at WOT. The ski used to feel like I was riding a teeter-totter and now it doesn't. I'm already .3 MPH faster than last year, even though I was spinning a 14/23 at 7250 RPM. Carl is pitching the prop to 15/25 and I should gain some more speed. Don't worry about losing speed.
Last edited by '02GPRider; 04-26-2007 at 09:23 AM.
04-26-2007, 09:35 AM #6
I didn't seem to loose or gain any speed in smooth water. Feels better hooked up in the rough though. My light daughter can ride in the chop much better without bouncing as much.
04-26-2007, 06:46 PM #7
thanks guys 4 all your feed back,
and to all the guys that sent me a private message as well apprecaite your input
04-26-2007, 07:38 PM #8
- Join Date
- May 2005
Dont expect any speed gains. The ski will be planted in the water much better in rough water since there is more water readily available keeping the pump primed. This may be one of the reasons why we have not seen that many 1300R's with a broken crank snout.
04-26-2007, 08:59 PM #9
anyone ever tried extending a 1300 but on the back side of the prop? Not sure how it would help but the jetboat guys do it??
04-27-2007, 12:34 AM #10
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