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Factory pipe seadoo 720

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manolocross

manolocross

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So I was thinking of putting one of these on my 95 xp and need some input... Anybody put one of these on a 720 and what were the results? Do you guys think its an engine killer? Would be a nice winter project and maybe add value to ski. 15 more horsepower and 5 more mph is promised. I am considering it. Any input guys?
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It is true it will make a monster out of a 720. It does make it have a tendency to blow up sooner of coarse. I have installed several and would be happy to talk you through it.

I don't like using the stock carbs even after re-jetting because it just always seems to ad up to a detonated rear piston. I have always had a set of aftermarket carbs. However I have read that a stock pair of 787 carbs work well so see if you can google some info on that.



BTW there are always plenty of these on the used market so don't overpay. I sold a brand new one in the box for $300 last summer.

I like this deal best at the moment..http://www.ebay.com/itm/Factory-Pip...420?pt=LH_DefaultDomain_0&hash=item2a3409a7b4
 
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Hey Matt but the instructions say a rejett is not necessary... I'm watching that deal on fleabay right now. I don't want to install if its gonna blow my engine. Your makin me nervous about it!
 
Is it possible to put this system on and still maintain its reliability and the engine to still last? I mean I also don't want to install and have take carbs apart 30 times. I still believe I can put this system on and the doo can benefit from better exhaust flow and ECWI...maybe I'm winter dreaming?
 
There is a long trail of burned rear pistons out there due to these pipes being bolted on. To make the incredible power that they do it is going to require more fuel and ultimately shorten engine life. I'm shocked to here that they put out instructions that say rejetting is not necessary because it is. I would not even run stock 717 carbs. I would bolt 787 carbs at least.

It is a whole can of worms to open but there is a lot there to gain. If you want a milder pipe that is still a good one then get that Rossier pipe on there for $139. You could safely keep your carbs with that(just open the HS needles and watch plug color). The ecwi (electronically controlled water injection) has a lot to offer every two stroke exhaust system. It really makes it snap off the bottom end.
 
So your sayin to bolt on a set of 787 carbs stock( with jets and needles) set for 787 use? What about a set of 787 with accel pump? I'm still considering it. Won't the 787 carbs flow too much fuel(too rich)??? I def appreciate your very experienced in put Matt. Thanks. Keep it comin!
 
Add the promised 18ish HP to a 85HP 717 and your right at what a healthy used 787 is putting out. I have not adapted the 787 carbs to the 717. I have always had a aftermarket set that I got with the matching intake manifold for $300 or less(I shop the forums everyday and try to be first).

Last weekend there were three of us over in Jax running through the weed trails. The heaviest of us three were on the 95XP while I was running my "Extremely Modified X4" and the other even lighter friend was on a stock 98SPX. The 95 XP with the FPP pipe was running all over us! I could overtake him on top end but his sudden "go" burst of getaway was awesome.

How many hours do do really put on that 717? Is 200 hours of 110 HP worth more than 300+ of 85HP?
 
This may be a dumb question, but after putting all this money into a 717 why wouldn't you just sell your ski and get a 96XP with a 787, then you would have the performance you're looking for plus the reliability. Most likely for the same or less money. Just wondering?

Lou
 
Well Lou I got a 97 spx with a 787 and I luv it but my 95 xp which has some sentimental value to me and I've never modded a seadoo. So I was just thinking about it as a winter project. Something to work on. I did not ride the 95 xp not once this season because my spx ran so awesome! So I was thinking of givin it a little boost. 95 xp is a great ski and I feel like its got more in it.
 
Nice ski. I once owned an 95XP it was the first ski I owned, and I remember thinking at the time, this ski is perfect. I still believe that. The 95XP has the perfect balance of power and hull and it was also the most reliable ski I ever owned. It never let me down, I sold it and bought a 96XP which was also a great ski. But I sure miss the 95XP, my advice KIS (keep it stock).

Lou
 
I have tried the APE pipe and they are good also. They have a good bottom end improvement but are not as good at revving as the Factory pipe. They are heavier and fill up the engine compartment more.

With the lighter weight and the pump extension a 95XP with a Factory pipe will out run a stock 787 X4.

Modding the 717 is tempting but dangerous. It has pistons about as large as the 787 but with a shorter stroke. With this and the reduced mass from a smaller crank and the lack of a counter balance shaft....you got a peppy little revver.

It is dangerous because a 717 is really maxed out already. It is basically the white 587 just enlarged but pushing out 85HP rather than 50. See that bigger pto on 717's? That is an attempt to keep the crank bearings cooler and have them last longer. If you put a tiny pto on it with that water injected Factory pipe you can't even keep the ski under your but. But like Lou says....you can throw reliability out the window.
 
Ok so I just might pull the trigger and do it... So Matt you got some carb tuning numbers? Pop off and Jett sizes? I will rejett the carbs... The engine is fresh. About 148 psi in each cylinder. I have to drain gas and put premium!
 
Take their recommended jetting and then open the high speed needle even further to start. There is a water flow adjustment that should start more on the open side as well. You will need a digital tach(TTO Trail Tech) to help you tune and you will need to read up on a "chop test".
 
Well I didn't win the auction... I will keep lookin... Winter dreamin... Hey Matt there is an APE exhaust on eBay. What do you think of this unit... I have read that it can break the exhaust port mounts. Any truth to this or have you had any experience with these pipes?
 
I have had a APE pipe before but I bought the ski with it set up already. It had aftermarket carbs on it. I have the instructions for a 787 APE pipe but not the 717. It is a good pipe and makes good power so it would need to be fed more fuel than your stock carbs will give. You should at least jet up a little if you try it.

It is a very heavy pipe so I can see that causing problems you mentioned. It is likely they could have been a wave jumper or had a broken motor mount allowing it to hit the hull.

For stock carbs and a pipe that would be a mild improvement would be that Rossier at $139. You will never have the problem with the welch plugs rotting out like on the oem pipes.
 
Matt Braley said:
There is a long trail of burned rear pistons out there due to these pipes being bolted on. To make the incredible power that they do it is going to require more fuel and ultimately shorten engine life. I'm shocked to here that they put out instructions that say rejetting is not necessary because it is. I would not even run stock 717 carbs. I would bolt 787 carbs at least.

It is a whole can of worms to open but there is a lot there to gain. If you want a milder pipe that is still a good one then get that Rossier pipe on there for $139. You could safely keep your carbs with that(just open the HS needles and watch plug color). The ecwi (electronically controlled water injection) has a lot to offer every two stroke exhaust system. It really makes it snap off the bottom end.
Click to expand...

I like your thoughts on the rossier pipe. I do want more bang at the bottom and i know you still aggressive on my pistons but not as bad as other pipes. From what ive read and is the gain from this pipe as much as others?
 
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I don't think the Rossier 717 pipe has a lot to offer over the stock tuned(two piece) one. The welch plugs won't rot out like the oem is guaranteed to. I have only bolted mine on once and remember it being much closer to stock then the Factory pipe.
 
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