GTX Stall?
Jennifer Aman
My friend and I bought new Sea-Doo's at the same time. I have a 1997 GTI
and he has a 1997 GTX. The problem is that his hesitates at about 20-25
MPH. He went to the dealer and was told that it would go away later. My
GTI does not do this. Does anyone know how this can be fixed? Is it
normal? Will it "go away" as the dealer says?
Thanks.
W.S. O'Neal
--
Bill @ E-MAIL: Water...@worldnet.att.net
Jennifer Aman <rfa...@mindspring.com> wrote in article
<34149E...@mindspring.com>...
jennifer,
Nope, it won't go away. It is a trait of this motor. It's here to stay.
Bill O'Neal
WCM
George Jefferson
:The problem is that his hesitates at about 20-25
:Nope, it won't go away. It is a trait of this motor. It's here to stay.
:Bill O'Neal
there is a very annoying abrubtness to the throttle response.
I would not call it "hesitation" though.
--
george jefferson : geo...@sol1.lrsm.upenn.edu
to reply simply press "r"
-- I hate editing addresses more than I hate the spam!
Gary Wood
My '96 GTX is/has always been rough in the 20-25 mph range. It seems to be
a characteristic of that PWC/engine. It makes it difficult to tow small
skiers (learning) at a slow speed. You are continuously trying to regulate
boat speed. I guess I'm used to it...
JD396
i run a challenger boat with the same egine/problem.
it will spontaneously slow down, and is hard to keep constant.
i wonder what groupk thinks about this?
jd
Bob Parkison
My 96 GTX acts the same as Gary's. But I'm still not used to it after 38
hours. Will probably sell the boat for this reason as I can not find
anyone who can fix it. I think it was called "Bombardier's dirty little
secret" in one of the PWC mags. When I asked two of my local Sea-Doo
dealers in Sacramento, CA, they said they never heard of "it" and no one
else has the problem. One of them suggested maybe it was the way I was
driving the boat? I think the mag also said Bombardier had no plans to fix
it. Maybe they can't fix it. I don't know.
Maybe the 98 GTX won't have it with the bigger motor. It's only our money.
Gary Wood <Gar...@dukepower.com> wrote in article
<01bcbd39$2e32d4c0$d0b8...@gew910c.dukepower.com>...
bubba
jennifer,
no it won't go away.The 785's with the rave vavle's will do this.
It has a rough spot exactly where you want to ski at.
It is a trade off for the great holeshot of this motor.
The Dealer's not being " up front ' with you.
bubba
Jennifer Aman <rfa...@mindspring.com> wrote in article
> My friend and I bought new Sea-Doo's at the same time. I have a 1997 GTI
> and he has a 1997 GTX. The problem is that his hesitates at about 20-25
> MPH. He went to the dealer and was told that it would go away later. My
> GTI does not do this. Does anyone know how this can be fixed? Is it
> normal? Will it "go away" as the dealer says?
>
>
> Thanks.
>
George Jefferson
:i run a challenger boat with the same egine/problem.
:it will spontaneously slow down, and is hard to keep constant.
wow..twin raves must be gangs of fun. I expect you need to
keep your trottle cables adjusted so both motors are on the
transition together.
Anyway, I hope actual problems arent being passed off as normal.
stall - bog - hesitation, are not normal. The response should be
instant from any speed, the trouble is you get way too much response
when you are trying to take it easy.
Pritchett
when I got a chance to ride a friend's GTX, there it was. It was
impossible (literally) to go 4500 rpms. At about 4200, the rave valves
would open and the engine would jump to about 5000. (at which time it
would run great). This happened about 28 mph, or about right in the
prime "tow range". Sea Doo's answer is "We sell the GTi as a towing
vehicle. This is a touring vehicle." (Do I hear the rhythmic tapping
of feet?)
Ben Herman
> > >
> That's correct. I had heard of this "dead spot" in the power band, and
> when I got a chance to ride a friend's GTX, there it was. It was
> impossible (literally) to go 4500 rpms. At about 4200, the rave valves
> would open and the engine would jump to about 5000. (at which time it
> would run great). This happened about 28 mph, or about right in the
> prime "tow range". Sea Doo's answer is "We sell the GTi as a towing
> vehicle. This is a touring vehicle." (Do I hear the rhythmic tapping
> of feet?)
Sea Doo does have a so call fix for this. My 97 SPX is been updated
with the new rave valves that will stop a lot of this hesitation. The
new valves have slots cut in them and the place they mount in, is
different
also. The dealers have this information and I was showed by them the
page
that was sent from Sea Doo. Maybe if you bitch enough Sea Doo could do
some type of recall notice on the ski. It seemed that with my factory
pipe on my ski the power band was smoother with the new valves and what
hesitation there was before, was in a different location and was not
noticable like before. This might work really well on a 3 seater that
is being used for towing.
Ben Herman
Corey Sullivan
>That's correct. I had heard of this "dead spot" in the power band, and
>when I got a chance to ride a friend's GTX, there it was. It was
>impossible (literally) to go 4500 rpms. At about 4200, the rave valves
>would open and the engine would jump to about 5000. (at which time it
>would run great). This happened about 28 mph, or about right in the
>prime "tow range". Sea Doo's answer is "We sell the GTi as a towing
>vehicle. This is a touring vehicle." (Do I hear the rhythmic tapping
>of feet?)
The statement they made is true. The GTX is meant to be romped on,
not held at low RPMs. That is why they tote the GTi as a towing vehicle.
It has the 717 engine which has no RAVEs so it can be held at lower RPMS.
Try towing with the GTX next year when it has the 947.... same
philosophy used this year.
--
Corey Sullivan
t...@dnai.com
"The Ultimate SD Oil Advocate!"
http://www.bulletcomputers.com/users/sdman/
(Only Used Sea-Doo Showroom on the Web)
---===* 1995 XP970 *===---
Larry KN4IM
Corey, what would happen if one were to disable the raves when towing.
Wouldn't it then run like a good, old, regular 2-stroker? Maybe it
needs a product you can switch! NORMAL for when you wanna go fast and
have raves jumping up and down with the dead spot....OFF when you
wanted a nice smooth power band for towing toys and dead boats.
Doesn't this have vacuum lines going to the bellows in the raves? How
about a simple VALVE?? Would that work?
Larry....just askin'
W.S. O'Neal
--
Bill @ E-MAIL: Water...@worldnet.att.net
Larry KN4IM <kn...@mindspring.com> wrote in article
<341763f3...@news.mindspring.com>...
>
> Corey, what would happen if one were to disable the raves when towing.
> Wouldn't it then run like a good, old, regular 2-stroker? Maybe it
> needs a product you can switch! NORMAL for when you wanna go fast and
> have raves jumping up and down with the dead spot....OFF when you
> wanted a nice smooth power band for towing toys and dead boats.
> Doesn't this have vacuum lines going to the bellows in the raves? How
> about a simple VALVE?? Would that work?
>
> Larry....just askin'
Larry,
There are no "vacuum lines going to the bellows" on the 787 motors, only
the 947 motors have the solenoid activated rave valves.
But there might be some problems to your idea of eliminating the action of
the valves, using a device to prevent them from opening. This would lower
the port timing several degrees, and could cause serious engine damage from
the increase in compression, just like Dan's motor was doing. One of the
reasons that Sea-Doo can get away with higher than normal compression in
their pump gas motors is that the port moves up with rpm. Not only does the
port timing increase, as the valve rises, but the port becomes larger too,
which does not allow as much unburned mixture to get trapped in the
cumbustion chamber, another detrimental problem solved by using a variable
port timing device (the rave valve).
Sea-Doo tried to please some of the more vocal GTX owners by installing a
different MPEM which uses different timing maps and some newly designed
rave valves, but neither will completely solve the problem of the surging
at mid range. the GTX is not the best choice for towing, the GTI with it's
non rave 720 motor is a much better choice.
Bill O'Neal
WCM
George Jefferson
: Sea Doo's answer is "We sell the GTi as a towing
:vehicle. This is a touring vehicle." (Do I hear the rhythmic tapping
:of feet?)
The transition is right at a nice touring speed as well (2 up, rough water)
SEADOORACR
Pritchett wrote:
>
> bubba wrote:
> >
> > jennifer,
> > no it won't go away.The 785's with the rave vavle's will do this.
> > It has a rough spot exactly where you want to ski at.
> > It is a trade off for the great holeshot of this motor.
> > The Dealer's not being " up front ' with you.
> > bubba
> >
> > Jennifer Aman <rfa...@mindspring.com> wrote in article
> > <34149E...@mindspring.com>...
> > > My friend and I bought new Sea-Doo's at the same time. I have a 1997 GTI
> > > and he has a 1997 GTX. The problem is that his hesitates at about 20-25
> > > MPH. He went to the dealer and was told that it would go away later. My
> > > GTI does not do this. Does anyone know how this can be fixed? Is it
> > > normal? Will it "go away" as the dealer says?
> > >
> > >
> > > Thanks.
> > >
> when I got a chance to ride a friend's GTX, there it was. It was
> impossible (literally) to go 4500 rpms. At about 4200, the rave valves
> would open and the engine would jump to about 5000. (at which time it
> would run great). This happened about 28 mph, or about right in the
> vehicle. This is a touring vehicle." (Do I hear the rhythmic tapping
> of feet?)
may make it less noticable and make it pull the skier better.
AE
George Jefferson
:Sea Doo does have a so call fix for this. My 97 SPX is been updated
:with the new rave valves that will stop a lot of this hesitation.
"so called" I gather it didn't really work?
Larry KN4IM
I guess leaving them OPEN wouldn't work, either, huh? That would
lower the compression at low speeds. The towers have plenty of power,
they just need it smooth....
Larry...sorry I was all wet. Didn't know they were running that
CLOSE to destruction.
Corey Sullivan
>Sea Doo does have a so call fix for this. My 97 SPX is been updated
>with the new rave valves that will stop a lot of this hesitation. The
>new valves have slots cut in them and the place they mount in, is
>different
>also. The dealers have this information and I was showed by them the
>page
>that was sent from Sea Doo. Maybe if you bitch enough Sea Doo could do
>some type of recall notice on the ski. It seemed that with my factory
>pipe on my ski the power band was smoother with the new valves and what
>hesitation there was before, was in a different location and was not
>noticable like before. This might work really well on a 3 seater that
>is being used for towing.
> Ben Herman
The fix you got was meant for boats that wouldn't go over
5000 RPMs. That was the point of the new valves. Every 800
motor has a flat spot at about 4000-4500 and that is due to
the jetting of the carbs, and the trransition from the low
to high speed curcuit. It is highly experienced mainly on GTXs
because the boat is heavier and takes longer to get up on a plane.
The SPX-hull was made to get on a plane faster, and the boat
is a lot lighter. So it isn't felt as much as the bigger GTX hull.
The new style valves also don't gum up less with oil, and this
was implemented on all 97 XPs and 98 GSX-Ltds, and will now be
standard on all SD skis for now on. I see it as a small fix for a
freak occurance that was happening so it doesnt happen again,
and so the valves required less maintenance.
--
Corey Sullivan
t...@dnai.com
"The Ultimate Sea-Doo Oil Advocate!"
http://www.bulletcomputers.com/users/sdman/
(Home of the Only Used SD Showroom