11-02-2009, 01:17 PM #1
- Join Date
- Dec 2008
Performance question with FPP, what is wrong?
I got 2 Seadoo GTI 04 720cc:
Single carbs true bored 40mm
Filled ride plates holes
Iridium spark plugs
Now I installed a Factory Pipe into one, of course I changed single carb for dual carbs (with intake). No ECW, there is a continuos water injection (no solenoid). The Ski run ok, accelerate perfect but I feel like I loss 3 mph top end speed instead gain, in fact my RPM increase about 500, but I compare speed with my other GTI (single carb stock pipe)and this second one has more top en speed.
Did I forget something to do? According to other members is why I didnīt put the ECW(also canīt install with my mpem), and they run fine (faster)their skis without ECW.
Engine sounds great, the problem is that I spend in Dual Carbs, Factory pipe and Doo is slower than before or worst slower than the other GTI stock for 3 mph.
Rotary valve is fine in stock degrees (re-aligned before install dual carbs).
And RPM really increases 500, but not the top end speed.
What do you recommend?
Because if I canīt fix this I think Iīm goig to return to stock pipe 'cause is faster for the ski for the moment.
And biggest problem my wife is going to yellme the money I spend and at the end I quit the performance parts.
Iīm sure I forgot something
thanks in advance guys!!!
11-02-2009, 02:44 PM #2
Have you jetted the new dual carbs according to the new setup ?
11-02-2009, 03:31 PM #3
- Join Date
- Dec 2008
According to FPP jetting stock, or It has to be different?
11-02-2009, 03:54 PM #4
Let me get this straight.
You are turning 500 MORE RPM but it is 3mph slower, with the same prop/pump?
That does not add up so... How are you reading the RPM and the MPH (as in, Tiny Tach, GPS, whatever)?
Now, I gotta ask, why in the world would you spend that much money and time to go maybe 50mph at best?
I am not trying to hate, but you could have paid less for a 951 powered GTX (granted, 2-3 years older) and been 10mph or more faster without doing a thing to it.
Users Browsing this Thread
There are currently 1 users browsing this thread. (0 members and 1 guests)
By Antiguan FZR in forum 4-Tec PerformanceReplies: 2Last Post: 09-22-2007, 08:48 AM
By jy in forum Yamaha PWC Performance (2-stroke)Replies: 7Last Post: 09-09-2007, 08:47 PM
By w/rpm500 in forum Yamaha PWC Performance (2-stroke)Replies: 0Last Post: 01-05-2007, 02:48 PM
By njgprider in forum Yamaha PWC Performance (2-stroke)Replies: 3Last Post: 07-24-2006, 09:10 PM
By Chrisrokc in forum Yamaha PWC Performance (2-stroke)Replies: 6Last Post: 05-06-2006, 06:12 AM