HELP PLEASE!!!!!! 2000 Seadoo GTX RFI Millennium Edition

[SaltLakeSeaDoo]

Looking for some help with my boat. I have taken it to two different mechanics and it has stumped both of them.

So here is the issue... I get out on the lake ride for a bit, maybe 20 to 40 minutes then it dies. We pulled the plugs and they are wet. It was last summer so I can't remember if it looked more like fuel or oil. After that it doesn't start back up.

I have a new rectifier, new battery, I think a new coil (the part that connects to the spark plugs, it's bolted to the seat mount), new plugs (twice) and new spark plug wires. The mechanic says my plugs have a huge arc, my battery tests great.

Any thoughts?

 

[MPower]

How many hours? Done a compression test? Fouling plugs could be a sign of low compression.

 

[SaltLakeSeaDoo]

I will check the hours later today or tomorrow. Did a compression test. And it tested good.

 

[mikidymac]

So is it just fouling the plugs and if you put a new set in once it dies will it run for another 40 minutes?

 

[SaltLakeSeaDoo]

That is the test for tomorrow. I'm going to get a couple spare plugs and see what happens tomorrow.

 

[mikidymac]

Have you checked to make sure your oil pump is adjusted correctly?

 

[SaltLakeSeaDoo]

Nope. How do I do that?

 

[mikidymac]

On the front cover (Magneto) of the engine below the front pipe mount you will see the oil pump. Get a mirror and you will see a small line on the lever and one on the pump housing. These two lines should line up. If they don't you will have to adjust the cable until they do. If it is out of alignment it will cause the engine to either get too much or too little oil.

 

[SaltLakeSeaDoo]

I'll check that today and get back to you. Thanks.

 

[SaltLakeSeaDoo]

On the front cover (Magneto) of the engine below the front pipe mount you will see the oil pump. Get a mirror and you will see a small line on the lever and one on the pump housing. These two lines should line up. If they don't you will have to adjust the cable until they do. If it is out of alignment it will cause the engine to either get too much or too little oil.
View attachment 35627

Here is a picture of mine. Your picture is kinda blurt so I couldn't really tell what was what. Hopefully mine come through well enough for you to see.

 

[SaltLakeSeaDoo]

How many hours? Done a compression test? Fouling plugs could be a sign of low compression.

Compression was good. 192.5 hours.

 

[Coastiejoe]

What were the actual compression numbers?

 

[SaltLakeSeaDoo]

What were the actual compression numbers?

I'll test it again tomorrow. It's been a few months and the guy who tested it can't remember.

 

[SaltLakeSeaDoo]

What were the actual compression numbers?

What should it be?

 

[Coastiejoe]

What should it be?

150 is like new, 140 is great, 130 is good, 120 is right where you can expect to see runability issues begin. At 120 it can run fine if everything else is good to go. Anything else wrong and 120 just is a bit low. Most do engine work over the winter when they see the 120 mark in the summer.

 

[SaltLakeSeaDoo]

Is this a filter that I could/ should change?

 

[mikidymac]

That is the oil injection filter and should be changed every couple years.

 

[SaltLakeSeaDoo]

Okay. So here is what I came up with while at the lake. First we started up the boat at the ramp, started fast and stayed on. Put it in the water and it wouldn't start. So we put it back on the trailer. Swapped out plugs, old ones (which aren't really old) were wet and smelled like fuel. Started great on land. Started okay in the water. Got it going. Idle at 830 to 860ish in wake less. Got it in open water, only a little choppy, full throttle 6280 rpms. Once warm and a little calmer water it went up to 6290. Ran it for about 10 minutes at which point I noticed my rpms dropping. So I headed straight towards the marina. Once inside wake less it died and wouldn't start. Got it to shore and changed plugs again. Never got it started again. New plugs were a little wet after just trying to turn over... towed it back to marina and put it on the trailer. Launched the other seadoo and played for a few hours. Once back at the truck the problem boat started right up on the trailer.


Any thoughts?

I'm doing a compression test in the morning.

 

[Coastiejoe]

The compression test will help us figure out a direction,,,

 

[wfo speedracer]

You need to get it someone who can check the codes, it will pick up on bad injectors which is a common issue on that model.

 

[SaltLakeSeaDoo]

Just did a compression test. Way worse than we remembered.

Front cylinder is getting 100 psi on compression test.
Back cylinder is at 130 psi.

 

[Strizzo]

Just did a compression test. Way worse than we remembered.

Front cylinder is getting 100 psi on compression test.
Back cylinder is at 130 psi.

there's your problem. the low compression causes an incomplete/cold burn and doesn't completely burn off the fuel/oil. those are good reliable, efficient skis as long as you have a healthy engine and clean, working injectors. if you put a rebuild in it, send the injectors off to be serviced while you're doing the swap. dirty/leaky injectors can kill a motor as fast as no oil. when they leak the extra fuel washes the oil off the cylinder walls and accelerates wear.

 

[SaltLakeSeaDoo]

So we pulled the head off and this is what we found.

 

[MPower]

Was hoping I was wrong

You got 200 hours out of it, not too uncommon to start seeing these kinds of failures at that point. The majority of my 2 stroke engine failures happened around 200 hours.

See if Nick Cairns has a motor for you.

 

[Coastiejoe]

Ok,,, these latest compression numbers make much more sense,,,

At least you know where you are now...