How do you spot a bad impeller?
Jeanette
I bought a 1997 GP1200 with about 150 hours on it. I've never ridden one
before I bought this one. The engine seems to run a little rough at Idle,
but sounds great any faster than that. The main thing is it cavitates badly
when I get on it out of the hole. It sounds a bit like when something gets
sucked up the intake grate, but once it gets going it's fine. I also have a
1997 Seadoo GSX that goes just a tad faster by one or two mph. I expected
more out of the GP. I looked inside the pump and the impeller is definately
got the sand blasted look - the edges are a little dinged, but no big
chunks.
So my question is: (1) Do they sound rough normally? (It sounds fine out of
the water.)
(2) Should I go ahead and get the impeller reworked or buy a new one.
(3) What about the pump housing? Do they get worn......
I'll take a picture up the pump and post it for inspection if that would
help.
Thanks guys!
Jeanette
PETERSPUDS
fix the impeller and that will help with getting you out of the hole.
Peter
tarza...@yahoo.com
Pretty much all the Yamaha's cant get out of the hole... If you want
one that does get out of the hole look at a 96 WaveRaider..
My roomates GPR churns and churns and cavatates badly. He even put a
Stainless impeller on it.. Barely helped. Slow holeshot is a
trademark of the big 3 cyl yamaha boats.Oh and you will love the fuel
economy of the 1200 (17.1 gph at WOT). Enjoy
Also as you noted tha tthe 97 GSX (I am thinking that has the 110hp
engine) is faster than the 3 cyl 1200 yam motor. Heheh its funny but
in my findings are the following
Flat water.. Ultra probably the fastest period
Light/medium chop.. Toss up between three.. Ultra (hang on) RX (great
holeshot & good top end) Gpr (a slug out of the hole. good top end)..
All three will run pretty much side by side top end maybe with slight
edge to Ultra providing the rider can hang on in chop. The RX seems
neck and neck with GPR top end stock.
Watching my roomate with the GPR Yamaha troubles I would never have
one. That cat converter must go. It drinks gas
Yamaha's got a great 2 cyl motors (solid as a rock) but the 3 cyls
reliability definitely not comparable.. in fact it sux.. I hate their
shamu hulls and uninspiring handling.. Just dont have the fun factor
of other vendors offerings
my .02
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PlexiPunk
>one that does get out of the hole look at a 96 WaveRaider..
Huh??? My wife has a 96 Raider 760. That thing is a dog out of the hole
compared to our 96 XP and 97 GSX.
Mario
compared to our 96 XP and 97 GSX.
>>
He means a 1100 Raider, you can't compare. Also the first generation 701 Raider
is a bullet out of the hole.
Now to address the allegations that Yamaha 1200 motors are unreliable. It seems
that you never experienced a GP1200, either riding or trouble shooting. The non
PV 1200 motor is one of the most reliable PWC motors ever created as is the
1100, I have no idea where you get the info from. Now as to holeshot, the
Blaster 2 is still the reigning champion stock for stock, and the GP1200 and
Raider 1100 are no slouches either. The GPR falls behind due to the weight and
other factors, but the bottom end problems can be overcome, and not with
thousands of dollars invested, you do have that option, but it really doesn't
take that much to have a fast reliable GPR that happens to be pretty quick out
of the hole. I think your comparisons with the RX are unfounded as an RX stock
or modified will never keep up with a GPR specially when the going gets rough.
The RX hull just plain sucks an I believe it's Sea Doo's second worse mistake,
second only to that timebomb they called a motor. I agree XPLs are exciting and
fun boats, but plagued with reliability problems. Yamaha's quality control has
suffered in the past couple of years, but as far as I'm concerned, they still
build the most reliable boats out there and though the 1200 PV motor is having
some issues that need to be corrected, I wouldn't trade it for anything. My
boat is modified and I've had NO down time due to OEM components or build
quality, I run hard in very rough water and the boat not to mention I, take a
pounding, frankly I'm surprised it's still in one piece.
Mario
:*( Summer's over
Dennis Copfer
"Mario" <gp12...@aol.comnospam> wrote in message
news:20011107153121...@mb-mv.aol.com...
> >>
>The GPR falls behind due to the weight and
> other factors, but the bottom end problems can be overcome, and not with
> thousands of dollars invested, you do have that option, but it really
doesn't
> take that much to have a fast reliable GPR that happens to be pretty quick
out
> of the hole.
It's all relative, Mario. Regional Closed Course racing is all about quick
out of the hole. I didn't see many *competitive* stock class GPRs where the
mod costs are truly low at only several hundred dollars plus. Are they out
there? In Beginner and Novice classes rider skills vary a lot (unless you
count only those who qualified for Novice Havasu), so it's hard to know when
a GPR that wins a few races is the boat or the rider. At Havasu, the best
Yam in Novice 1200 stock class was 13th.of 16 who made the mains. Not sure
if that was a GPR or an old style. In ProAm the best was 10th, and there
were only 2 boats that made the mains there, also.
http://www.ijsba.com/ijsba/index.cfm?s=ijsba&t=2001_events/wf2001_results_cc
_all.htm
In Expert Limited, it would be interesting to get some average estimates of
what needs to be spent for the GPR to win. I'd guess they're into the
$8-10K neighborhood for additional costs including parts and labor . . with
much more quite possible. Used GPRs of that caliber seem to be running
$20K+ and I'm sure those are at some loss on full costs.
Now you can add a head and perhaps limit mods and fixes to <$2K, but then
you have a 93-octane boat that you're comparing to the stock GPR instead of
comparing performance of different boats under the same rules as we get by
looking at racing classes.
Adding $1-2K is adding 12-30% to the price of the GPR depending on what
someone paid . . pretty high costs for performance improvements that are far
lower than those percentages. Especially when 1/4+ of those funds are
required just to get the GPR to reliably run the way it should have come
from the factory! That ignores the lost EPA rating if you have to take the
cat con out because it costs $1K if it breaks at 50-80 hours . . which could
be a big problem for somebody in California in Tahoe or elsewhere in the not
too distant future.
dc
Jeanette
I will say the GP goes through close to twice as much gas as the gsx, the Gp
has a much sporty feel to it. Although the GP is louder, it's a sound of
authority. What's a 1200 PV? You guys are talking so far over my head it's
not even funny. Our two skis our for our family of four.
We ride in Mission bay San Diego and the Colorado river with it's associated
lakes. We love to have fun... No high end racing, No high end
modifications. Should I get my impeller repaired or get something
different? We have thought about replacing the stock sponsons with
something like beach house. Is it that much of a difference? I'm not
talking about modifications that split hairs trading big dollars for barely
perceptable differences in power & handling. We are new to this. It's only
recently that I've gained the knowledge I have & I do pick up quick. I have
enjoyed the amount of traffic and feedback rec.jetski has provided. Thanks
all for your comments.
Warm in San Diego,
Jeanette
"Dennis Copfer" <jets...@earthling.net> wrote in message
news:1GoG7.23304$S4.21...@newsread1.prod.itd.earthlink.net...
Dennis Copfer
ski when it is on the trailer. It will usually sound like it is spinning
air instead of water and/or vibrate. They can usually be repaired by
somebody like www.impros.com as if they were new. You might also ask the
folks at impros for the improvements you might see from changing to an
aftermarket prop, especially if you have a GPR instead of the older GP.
PV usually means Powervalve
Aftermarket sponsons help to keep the PWC from spinning out and can be very
important for safety in racing on some models. On a GP, you might try
adjusting the height of the stock sponson before spending more money.
Especially if they're now higher on the hull and can be adjusted (GP) or
mounted lower (GPR). As a general rule, the more a sponson sits lower in
the water, the greater the chance for lost speed. That ok if you have
modified for more power or are willing to trade off a small speed loss for
the handling of more precise, sharp turns.
dc
"Jeanette" <hai...@adnc.com> wrote in message
news:3bea2cbb$0$193$9a6e...@news.newshosting.com...
> Hi again guys,
>
What's a 1200 PV? You guys are talking so far over my head it's
> not even funny.
>Should I get my impeller repaired or get something different?
Jeanette
It sounds like it's sucking air out of the hole. I guess I'll be pulling
the impeller. Thanks for the advice and the input on sponsons. I think the
stock sponsons are adequate for me. I've ridden with them low and half
way - I haven't noticed much of a difference - yet. Still, today was the
third day I've ridden the GP. I sure like the way it feels compared to the
GSX.
Jeanette
"Dennis Copfer" <jets...@earthling.net> wrote in message
news:JRIG7.27036$hZ.24...@newsread2.prod.itd.earthlink.net...
Dennis Copfer
sealed well. This was a common problem on '00 GPRs where some people
reported the pump shoe was not properly sealed when it was installed. It
can also be the case if a foreign object has been run through the pump, or
if the pump was pulled and not properly replaced..
dc
"Jeanette" <hai...@adnc.com> wrote in message
news:3bee0d97$0$179$9a6e...@news.newshosting.com...