Need advice on 2000 GTX carb 951 model

[offgrididaho]

Bought a low compression (either 100ea cyl or 110 ea cyl , used 2 gauges) seadoo in great condition with a trailer in great condition for $900.
The trailer is worth 900 so I got a near new looking ski free. The clock shows 225hrs. I need advice on how to proceed. It was supposedly rebuilt and never ridden and I can see paint chips off head bolts but nothing else. Gray lines have been replaced. Not sure if carbs were rebuilt. Last reg tag is 2025.

Do I swap motors?
Do I use a wiseco top end and see how long it runs?
Where is a great place to buy a motor?
Do I rebuild it myself including crank?

Warranty is meaningless to me as I won't ever pull a second motor and install a third. TOO MUCH WORK! Im too old and have bad arthritis.
I need a motor that WILL BE 100% reliable and never need a warranty. I know its a lot to ask but I dont want junk!

 

[WhiskeyD]

Why not tear down the motor in it and inspect?

 

[offgrididaho]

?
To what end? I know the motor is bad.
Did you see the 4 questions I asked?

 

[shamrock246]

Can you bore scope the cylinders? Does it run?

Do you have a spare motor to swap out?
The bore sizing has to be done different for forged pistons vs cast (OEM)
Not sure of a good place to buy a rebuilt motor, I rebuilt my own.
I rebuilt mine (787), I had my crank rebuilt by Competitive Crankshafts on Facebook and a top end kit from River Rat Bob on eBay. GroupK is highly recommended for top ends.

 

[burtshaver2021]

?
To what end? I know the motor is bad.
Did you see the 4 questions I asked?

As mentioned above I think inspecting the motor would be you first step. Take it apart, measure your bores. You did mention it was just rebuilt? Have you tried starting it? It would be good for you to know what you have. Or if you don’t want to be bothered with that type of thing just buy a rebuilt moto and drop it in. Peter Rucinsky is who I would recommend. Can’t remember the business name but if you search his name you should be able to find him

 

[burtshaver2021]

Just read the last part of your original post, sounds like the best thing for you to do would be to tow the whole machine to someone and have them pull the engine and drop in a new one for you. Again Peter Rucinsky. Don’t get any blow Joe to do the work, I can tell you from experience that automotive mechanics don’t know these machines well enough to do the work properly. You need someone with plenty of experience with them

 

[offgrididaho]

It started and ran when i got it home. Too cold to put it in water. Compression is either 100 or 110 depending on which gauge is right. I think the head was off but see no signs of the rest of the motor being out or rebuilt. I think the rebuilt is BS. It would have only 5hrs since rebuilt and 100psi, nope! The rear cyl is leaking 1lb per second. The front is leaking 1lb per min.

What is the cost to get the crank rebuilt?
What does Fox charge to build a 951-carb model?
How much is a wiseco top end? (is that the best?)
Is there something better then wiseco?
Where do I get my cylinders bored .005 over?
Is that the size I want to go?
I do not have a way to measure anything precisely.

 

[burtshaver2021]

I would ensure that I have a good compression guage, you’ve already mentioned one gauge reads 100, another gauge reads 110, do you have a good strong battery in it? By the way, never ever boost it from a running vehicle. If you tested it cold numbers would be lower, on these 951’s 130 is perfect compression, the rings probably have not seated yet. I’m not saying the motor is good, and I definitely have no way of knowing if the crank was rebuilt or replaced but the fact it runs would entice me to investigate further. You may be replacing a perfectly good engine. I’ve never heard of doing a leak down test on a 2 stroke? I’ve heard of doing it on a 4 stroke engine but I’m far from an expert. Like to hear more about the cylinder leak down for a 2 stroke.
With that being said if your dead set on just replacing it. I don’t know the cost of a rebuilt crank, I would guess 800.00 ish. I don’t know what Fox Powersports charges to rebuild but I would call them, and if at all possible I would take the machine to them. They have a great reputation of standing behind there work and you don’t want to spend a fortune just to have it melt down due to an air leak.
Peter will bore them out, it will be a minimum of .010, (.25mm)
I would not use forged pistons, I’ve seen Pro X pistons thrown around on here, but definitely cast pistons.
At this point if your rebuilding, you just need to make some calls for pricing

 

[offgrididaho]

I would ensure that I have a good compression guage, you’ve already mentioned one gauge reads 100, another gauge reads 110, do you have a good strong battery in it? By the way, never ever boost it from a running vehicle. If you tested it cold numbers would be lower, on these 951’s 130 is perfect compression, the rings probably have not seated yet. I’m not saying the motor is good, and I definitely have no way of knowing if the crank was rebuilt or replaced but the fact it runs would entice me to investigate further. You may be replacing a perfectly good engine. I’ve never heard of doing a leak down test on a 2 stroke? I’ve heard of doing it on a 4 stroke engine but I’m far from an expert. Like to hear more about the cylinder leak down for a 2 stroke.
With that being said if your dead set on just replacing it. I don’t know the cost of a rebuilt crank, I would guess 800.00 ish. I don’t know what Fox Powersports charges to rebuild but I would call them, and if at all possible I would take the machine to them. They have a great reputation of standing behind there work and you don’t want to spend a fortune just to have it melt down due to an air leak.
Peter will bore them out, it will be a minimum of .010, (.25mm)
I would not use forged pistons, I’ve seen Pro X pistons thrown around on here, but definitely cast pistons.
At this point if your rebuilding, you just need to make some calls for pricing

OK, thanks. How do I get a known good gauge? I just rented 2 brand new gauges from 2 different auto parts stores.
How do I tear into the motor to see if everything is replaced and new? How do I know if carbs were rebuilt?
I dont have a bore scope nor can you rent one.
I dont have the fancy tools to measure a bore.
How much different is compression cold/hot, ive heard it maybe 5 lbs. I doubt its going up 30 psi. I tested another ski the other day and it had 143/170 COLD. Same ski, a GTX carb model, same guage.
I called Fox about a rebuild and its $1650 + aprox 200ea way for shipping. NO WARRANTY---->ZERO!
Called the Boise crank builder and he would rebuild my crank for 625 and parts for top end and bore each cyl was another 525 with 80ea way for ship.