2002 GTX Di

[mike4slund]

So I recently acquired this new water skooter. It has a fresh rebuilt engine. The previous owner said that it wont rev past 3k RPM's. When I picked it up, he started it and it revved to about 5k to 6k RPM's. Compression is about 110psi - 120psi. I have read multiple things where this is normal and not. Not sure what to believe, New regulator/rectifier (i installed it). New fuel pump is being delivered tomorrow (from the previous owner). I have not actually checked fuel pressure yet. After speaking to him some more, it wont rev past 3k RPM in the water. I have yet to put it in the water to test it. No codes or errors on the dash. Brand new battery as well. Starts and runs within the first crank.

He also said that since the engine was rebuilt, he added some oil to the gas because he wanted to lubricate the cylinders. I am tempted to remove it and put fresh fuel in. Since the oil tank is full of blue oil (assuming that is seadoo specific oil?)

I was taking a peak at the impeller, to me it looks like it has some severe wearing on it. If you look closely, it does not look straight or normal.

Is this tube on the left where the water gets sucked in at? Or does it need to be plugged before setting in the water?

Sorry for the million questions. I am very new to these machines. I am going to stick it in the water and see what happens. Am I missing anything? Am I way off base here?

 

[WaarrEagle]

Is compression even on the cylinders? If you unplug 1 fuel injector, will it idle smoothly on each cylinder? What are the specs on the new fuel pump?

 

[jimmyluke]

So I recently acquired this new water skooter. It has a fresh rebuilt engine. The previous owner said that it wont rev past 3k RPM's. When I picked it up, he started it and it revved to about 5k to 6k RPM's. Compression is about 110psi - 120psi. I have read multiple things where this is normal and not. Not sure what to believe, New regulator/rectifier (i installed it). New fuel pump is being delivered tomorrow (from the previous owner). I have not actually checked fuel pressure yet. After speaking to him some more, it wont rev past 3k RPM in the water. I have yet to put it in the water to test it. No codes or errors on the dash. Brand new battery as well. Starts and runs within the first crank.

He also said that since the engine was rebuilt, he added some oil to the gas because he wanted to lubricate the cylinders. I am tempted to remove it and put fresh fuel in. Since the oil tank is full of blue oil (assuming that is seadoo specific oil?)

I was taking a peak at the impeller, to me it looks like it has some severe wearing on it. If you look closely, it does not look straight or normal.

Is this tube on the left where the water gets sucked in at? Or does it need to be plugged before setting in the water?

Sorry for the million questions. I am very new to these machines. I am going to stick it in the water and see what happens. Am I missing anything? Am I way off base here?

The tube on the left that you’re referring to is where the water comes out during normal operating conditions. It is also where you would hook your water hose to to back flush the engine while it is running. So do not plug it. Also most likely you have the wrong oil in there and should be changed. The Seadoo two-stroke full synthetic oil is red.

 

[mike4slund]

Is compression even on the cylinders? If you unplug 1 fuel injector, will it idle smoothly on each cylinder? What are the specs on the new fuel pump?

Compression is identical on both cylinders. within 1 - 2 PSI of each other.

Would you expect it to run smoothly on each cylinder? I have not done that yet. I can do that tomorrow.

Not sure on the specs. This is what the previous owner gave me today.

 

[mike4slund]

The tube on the left that you’re referring to is where the water comes out during normal operating conditions. It is also where you would hook your water hose to to back flush the engine while it is running. So do not plug it. Also most likely you have the wrong oil in there and should be changed. The Seadoo two-stroke full synthetic oil is red.

Thank you. Do you have a link to the oil I should have in there? The oil line and tank are stained blue, so I am going to assume it has been in there for a while.

 

[WaarrEagle]

I still have a bunch of the old but correct oil and it is blue. So it may not be the wrong stuff.

The DI should idle smoothly on each cylinder individually. That is an aftermarket pump and it is hard to tell where from. Many folks have had bad luck with aftermarket fuel pumps as the OEM is apparently a unique design that is hard to replicate.

 

[Tyman2020]

the color dye has nothing to do with the oil specs....however alot of the cheap stuff is blue

 

[mike4slund]

I still have a bunch of the old but correct oil and it is blue. So it may not be the wrong stuff.

The DI should idle smoothly on each cylinder individually. That is an aftermarket pump and it is hard to tell where from. Many folks have had bad luck with aftermarket fuel pumps as the OEM is apparently a unique design that is hard to replicate.

I'm not even sure if I need to replace the fuel pump as of yet. That's just what the previous owner ordered. I am going to check fuel pressure before slamming a pump in it.

I also learned today that the previous owner mixed oil with the gasoline because "he wanted to make sure the cylinders would be oiled" since the fresh rebuild. So I feel like since oil is being injected AND there is oil mixed in the gas. That this may be causing the problem? I feel like to much oil and not enough gas would cause this problem. Especially under load in the water?

 

[WaarrEagle]

I'm not even sure if I need to replace the fuel pump as of yet. That's just what the previous owner ordered. I am going to check fuel pressure before slamming a pump in it.

I also learned today that the previous owner mixed oil with the gasoline because "he wanted to make sure the cylinders would be oiled" since the fresh rebuild. So I feel like since oil is being injected AND there is oil mixed in the gas. That this may be causing the problem? I feel like to much oil and not enough gas would cause this problem. Especially under load in the water?

Mixing oil and gas for break in is recommended for non-DI's. Assuming it is the correct oil and not mixed in some insane ratio, can't imagine it causing anything other than excessive smoke. I still bet you a have a fuel pressure issue, as did the previous owner if he bought a replacement fuel pump.

 

[mike4slund]

Mixing oil and gas for break in is recommended for non-DI's. Assuming it is the correct oil and not mixed in some insane ratio, can't imagine it causing anything other than excessive smoke. I still bet you a have a fuel pressure issue, as did the previous owner if he bought a replacement fuel pump.

Well. I will definitely check fuel pressure then! Is there a port? Or do I need to tee into the line? I thought I saw the procedure in the manual. But cannot seem to locate it again.

 

[jhjesse]

Mixing oil with gas on a DI is not good. Will plug your injectors.

 

[mike4slund]

Should there be something on the white fitting??

On the driver side of engine. Air intake possibly?

 

[jhjesse]

Nope. That is for fogging the engine.

 

[WaarrEagle]

Well. I will definitely check fuel pressure then! Is there a port? Or do I need to tee into the line? I thought I saw the procedure in the manual. But cannot seem to locate it again.

No port. You have to tee into the line. Most of us do it in place of or just after the in-line fuel filter.

 

[mike4slund]

No port. You have to tee into the line. Most of us do it in place of or just after the in-line fuel filter.

These looked crimped on. How would I service the filter? I've never seen anything like it before.

 

[WaarrEagle]

These looked crimped on. How would I service the filter? I've never seen anything like it before.

Original fuel filter was crimped but most have been cut out by now and replaced with hose clamps. If that filter is original, it could be the source of pressure issues.

 

[mike4slund]

Original fuel filter was crimped but most have been cut out by now and replaced with hose clamps. If that filter is original, it could be the source of pressure issues.

Definitely going to be cutting it out and replacing it. Then I will check for fuel pressure. But after some more testing within the last hour. I have another question that may also be the cause of my issues. My battery is at 12.6 to 12.8 while running. But. The battery light isn't on. And the rectifier is new as well. How common is a magnito failure? Should I try another new rectifier first? Other things to check first?

 

[etemplet]

Nope. That is for fogging the engine.

smoke check??

 

[etemplet]

Mixing oil with gas on a DI is not good. Will plug your injectors.

thefuelinjectorman.com told me the premix won't hurt the injectors. That said... I wouldn't do more than 80:1 BUT.... I don't think adding oil to the fuel is needed at all.... EVER so I don't do it. LOL If you pump is working properly you just don't need it.

 

[etemplet]

Definitely going to be cutting it out and replacing it. Then I will check for fuel pressure. But after some more testing within the last hour. I have another question that may also be the cause of my issues. My battery is at 12.6 to 12.8 while running. But. The battery light isn't on. And the rectifier is new as well. How common is a magnito failure? Should I try another new rectifier first? Other things to check first?

I just checked my battery and it is 13.2 and didn't really go up much when I rev the engine. Kind of a concern for me at the battery voltage is about 12.9 when I shut down. Just a note but I put a lot of used parts on my skis.

 

[jhjesse]

smoke check??

You should always fog your engine with fogging oil after use especially if it is not going to be used for a while. Example; winterizing.

 

[jhjesse]

thefuelinjectorman.com told me the premix won't hurt the injectors. That said... I wouldn't do more than 80:1 BUT.... I don't think adding oil to the fuel is needed at all.... EVER so I don't do it. LOL If you pump is working properly you just don't need it.

Well he would know.

 

[WaarrEagle]

Definitely going to be cutting it out and replacing it. Then I will check for fuel pressure. But after some more testing within the last hour. I have another question that may also be the cause of my issues. My battery is at 12.6 to 12.8 while running. But. The battery light isn't on. And the rectifier is new as well. How common is a magnito failure? Should I try another new rectifier first? Other things to check first?

That does sound low. The service manual has numbers that you should see at idle and at (i believe) 5500 RPM. I recently bought a used OEM unit off e-bay to replace mine for ~$20 and so far so good. I wanted to buy the upgraded unit from OSD but they were backordered at the time: OSD Heavy Duty Rectifier - Sea Doo 787 RFI / 947 DI (1998-2004) [OSD4001] - $94.99

 

[mike4slund]

Fuel pressure is good. My fuel pressure gauge mazes out at 100. But it quickly went to the max. But this is what came out of the filter. I couldn't test fuel pressure with the filter in it. So I have nothing to compare it to.

 

[mike4slund]

That does sound low. The service manual has numbers that you should see at idle and at (i believe) 5500 RPM. I recently bought a used OEM unit off e-bay to replace mine for ~$20 and so far so good. I wanted to buy the upgraded unit from OSD but they were backordered at the time: OSD Heavy Duty Rectifier - Sea Doo 787 RFI / 947 DI (1998-2004) [OSD4001] - $94.99

Thank you for the link.

I did check amp output like service manual suggests. And I was within specs. So maybe I'll try a new rectifier.