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Just my $.02 but I wouldn't waste the money to get more power. Ride it for another 50 hrs and then rebuild it, or buy a reman engine. The 951 is a powerhouse already and IMHO, you will be...

+1 It would help to know where you are starting from and what you are wanting to accomplish.

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Do you have a good rebuildable core, or did your existing motor explode beyond repair?

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First place I would look would be a faulty starter solenoid. The ski is 26 years old and its possible that the starter solenoid contacts are worn out.

However, what would happen if you unplugged...

DOWNLOAD YOUR FREE MANUAL AT THE TOP OF THIS FORUM.

In order to be absolutely sure, I would dispose of all old fuel, clean the fuel system and make necessary upgrades/repairs and then try...

Pictures of the engine compartment? I assume salt water usage. If you at least pull the carbs off, you should be able to look down the intake and see the rotary valve plate turning as you rotate...

I've never needed to use the "Ether Bunny" to start a ski....ever. If you need something combustible to try, use carb cleaner. Pretty much any carb cleaner will do. A 1-2 second blast down the...

The 3 bolts should have a drop of blue loctite on the threads. On my pump fill plug(s) I use PTFE sealant. I run the plug down until its flush with the plastic and leave it.

I use a similar...

Top of this forum! Find your manual and download it.

I can not emphasize this enough: If you dont know the status of the INTERNAL carb filters, I wouldn't recommend it.

Clogged internal...

Exactly where did they source the regulator? Out of curiosity, when the slow speeds started, did you try to disconnect the new regulator from the battery to see if it may have changed anything? ...

Pictures? I'd like to see the setup.

Per the shop manual: All models with a 947 engine, the rectifier/regulator is integrated in the MPEM.

So are you saying the shop installed a NEW MPEM? Or did someone try and connect some sort of...

Its not so much "not-reliable" but high-maintaince because it runs at the bleeding edge if performance for its size.

Personally, since I rebuilt my first 951, I thought it was a decent trade...

You have a 951 Time Bomb. Any 951 over at 150+hrs needs to be considered to be running on borrowed time. The engine MIGHT be telling you that it's time to get a full upper engine rebuild done, if...

You didnt post in the 4 stroke sub-section. Thats probably why no on responded, everyone in this section talks about 2 strokes.

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The guy might even drop the price further once the season is over. Then again, I don't know how long the riding season is in your part of Texas.

He may eventually get his asking price and then...

Something else I forgot about. There should be a rubber boot that fits completely around the exhaust manifold to expansion pipe connection. The gasket there was a possible weak point in that water...

Found them. Just as bad as I remember.

951 Grenade Pics -- Click Here

Being that you didnt say anything about GTX DI, they should be 951cc carbureted models. Actually, that's what you really want. The injected models can be a pain when something electronic breaks. ...

Replace plugs every season. They're cheap. Also, inquire with Chris at Watercraft Magic for their jet kit and Prox filter setup for the 951. The stock airbox lends itself to ingesting water on some...

Looks like someone has done some hack wiring. There should be a single small ground wire with a ring terminal that exits from the TOP of the electrical plug under the rubber boot. The wire your...

I second the comments about DIY. Unless you are doing the work yourself, they will turn into money pits.

You could rebuild the engines yourself, but you would still need to either A. Send your...

Voltage regulator, replace fuel lines, INTERNAL CARB FILTERS NEED TO BE CLEAN.

Disconnect the trim module power supply until you can verify that it's functioning correctly. The glass reed...

I would remove the entire oil pump and RV cover assembly and test it for the proper number of drips using a drill. The oil pump may be good, but you could have a clogged/blocked oil injection check...

If there is that much liquid in the bottom of the crankcase, the only thing you can do is keep cranking until it's out. However, while cranking, make sure you install the ignition wires on the...

So what happens when you take the GTX carbs and install them on the SPX?

At this point I feel we need detailed pictures to help troubleshoot. That video link didn't work for me.

I would be...

I feel like something isn't adding up.

Impulse line from engine crankcase connected to the fuel pump?

Are the fuel lines connected correctly as per the manual?

Have you verified that the...

Buy a GENUINE WSM UNIT. I think yours should part number 004-221 www.wsmparts.com

Made in Brazil by ArielTek. Rebranded by WSM in the USA.

http://arieltek.com.br/produto/MRETSD-02-104
...

Clean those tiny carb filters! Do not underestimate the power of the carb filters to wreck your engine by creating a lean running condition.

Remove both the pilot and main jets and make sure they...

Its not so much as a steep learning curve as it is an adherence to being detail oriented. If you read enough of the forums, you will tend to find that SeaDoo designs(designed?) their products to...

I would like to add that I think you need to verify the age of the voltage regulator. Does it look like it's been in there for 23 years or look newer? For $hits and grins, disconnect the red wire...

D.E.S.S. Post......and ya beat me to the punch. Glad you found them all.

The plug on the front far right of picture... I can't be for certain because if it's a three pin connector, I'm having a hard time identifying it on the wiring diagram. Please pull back the...

They should find corresponding plugs route to the Rear Electrical box and VTS respectively. The four wire plug connects to the HEAD TEMP SENSOR(Tan), Main Fused Power(Red/Purple), Starter...

In your 2nd post, that plug exits aft but actually turns around to the front of the ski and it connects to the info gauge.

Corrosion blockage caused by salt water inside the expansion pipe or barb fitting?

I'd remove the hose from the expansion pipe and then the hose barb fitting. Fish a piece of solid wire inside...

What is the history on the carbs? Ever been removed and cleaned? Absolutely need to verify that the tiny internal carb filters are clean.

How many hours on the ski? 150 seems to be the magic...

I'd like to try and go back to the basics.

Let's start with some assumptions:

1. The engine is assembled correctly meaning that the piston orientation is correct and that the piston rings are...

Definitely could use some pictures of what you are working with.

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We definitely need to know what the compression numbers are to begin to accurately diagnose your problem.

Links for further info

96XP Voltage Regulator Internal Pics

What the Voltage Regulator looks like using an Oscilloscope

WSM

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The WSM unit I bought I think is a rebranded Arieltek unit. Made in Brazil I think.

http://arieltek.com.br/nautica/Sea+Doo/18

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Yes, pulling the red wire from the voltage regulator will allow you to test the charging system. And yes, the battery won't get charged during this time. So I dont recommend staying out on the...

Crazy idea: Have you changed your voltage regulator? I had a similar running problem on my 1st 96XP. It's like it wouldn't get up on plane without using the choke. Come to find out that the...