1996 XP 787 - no compression in pto cylinder

[petohazy]

Hi all,

Just acquired a 1996 Seadoo XP. It was a throw in, with the 2004 Seadoo GTX 4-tec Supercharged I purchased. I did do a seatrial on the XP, and it ran strong until at wide open throttle it just died. I figured it was old fuel or carbs gumming up. Did a compression test and found 145 PSI on mag end, and basically 0 PSI on PTO end. It's interesting that it ran so well before it died. My question is, what's the best way to start diagnosing the problem. Is there anything I can check before pulling the head?

Thanks for any help,
Pete

 

[manolocross]

Pull the head... I'm sure you will find a surprise in there...

 

[brock1]

a nice little hole in the piston ......u have to pull the head..no way around it...

 

[Minnetonka4me]

LOL doesnt everyone say "it ran awesome right before it died"??

The damage was prob already there it just needed one more push.

 

[adamsbj123]

I wouldn't waste alot of time pulling the head etc. You can peak through the spark plug hole and see the issue. You need a new engine. Considering the age of the ski it is beyond just a new top end. Consider a reman swap from SBT. It is quick and you will have the piece of mind of a no fault warranty. Most likely you experienced a lean run. So be sure to rebuild and adjust the carbs and replace the fuel lines while you are at it. Good luck.

 

[petohazy]

Well, got the heads off and found the surprise. Looks like the rave valve snagged the ring on the pto side cylinder. The rings are shattered and the piston and head are chewed up. The mag side cylinder head also had an oily muddy liquid in it. With the pieces of the rings missing and possibly water ingestion, I don't think I would attempt just a top end rebuild. Looks like I need to figure out if it's worth rebuilding the entire engine, or if i should just sell it. At least the VTS trim and guage work.

 

[Jetskigoodies]

My bet is the pto side, leaned out. When we get them with pistons like that it is always the pto side. Were the fuel lines still the stock grey lines. If you open up the carbs, the carb without the pump on it or the rear carb, the internal filter will be filled with a green sand like substance.

 

[petohazy]

Yea, still had the gray fuel lines. Any thoughts on who is the best rebuilder on these engines. I would like to have mine rebuilt rather than swapping for a reman. Doing a quick search, I found a place called Fullboreonline.com that claims a better than new rebuild of my engine. Also found SES, which would rebuild mine.

 

[Jetskigoodies]

Full bore is awesome, its right here in mi, but they dont rebuild cranks. If you dont want to rebuild it yourself, they are the way to go. If you want to rebuild it yourself, send them your jugs, and get yourself either a hotrod crank, sbt crank or you can find an oem rebuilt crank. If you dont want to do the work yourself and you want that warranty I recommend fullbore. Others will tell you to go elsewhere, but everyone has their own opinions. From what i hear ses is good but it takes them a long time to get your engine back to you.

 

[adamsbj123]

Full bore is awesome, its right here in mi, but they dont rebuild cranks. If you dont want to rebuild it yourself, they are the way to go. If you want to rebuild it yourself, send them your jugs, and get yourself either a hotrod crank, sbt crank or you can find an oem rebuilt crank. If you dont want to do the work yourself and you want that warranty I recommend fullbore. Others will tell you to go elsewhere, but everyone has their own opinions. From what i hear ses is good but it takes them a long time to get you engine back to you.

You are right. Opinions vary. I can tell you first hand that I have an engine at SES right now. Reviews indicate that they do quality work and they have great prices. I sent it to them back in August. I was told 6-8 weeks. It has been 5 months now.............still waiting.

 

[Robj]

SES had two of my engines, just got one back. If you go that route, make sure you get them to committ to a ship date. On their website they have a guaranteed ship date. SBT is also an option, but they are more expensive and they will do an exchange, not rebuild yours.

 

[manolocross]

5 months waiting is unacceptable....why don't you call them???

 

[Jetskigoodies]

Im sure he has, problem is they already have his motor and money. His leverage is gone. Im sure if he called his credit card company something could be done. They are notorious for this though,