2000 GTX RFI 800 Exhaust Backflow pressure issue

[Larfme]

I recently purchased this PWC.
It runs okay out of the water but totally bogs in the water.
If I disconnect the Waterbox, it runs great.
I pulled the waterbox, flushed and cleaned it, reconnected it and same problem.
It seems the box is restricting the exhaust flow.
Even if there is no water in it.

Is the motor putting out too much exhaust pressure?

 

[mikidymac]

Check the big rubber hos that goes from the waterbox to the outside of the hull. They are known to delaminate on the inside and choke off the engine.

 

[Larfme]

Check the big rubber hos that goes from the waterbox to the outside of the hull. They are known to delaminate on the inside and choke off the engine.

thank you. I did. It bogs with only the waterbox attached and no piping connected to the discharge of the waterbox.

 

[Larfme]

The box looks like this. Looking inside, it has one flanged hole. It also has some sort of covered hole.

 

[mikidymac]

I would check your compression.
I haven't heard of a waterbox causing this issue unless a baffle broke free but you should hear it rattling around.

 

[Larfme]

I put it back together, everything seemed okay. Then I thought what if the RAVE valves are stuck. I removed them and found that there is a spring on the top of the valve, and a smaller spring under the baffle. I watched a few videos and one of them says there should never be a spring under the baffle. Is that true? I also don't see a second spring in the rebuild kit.

 

[mikidymac]

Are you talking about the ones on the engine or the water valve on the waterbox that looks like a rave valve?

 

[mikidymac]

On a 2001 GTX RIF there are two springs on the engine RAVE valves, #10 and #15 on the attached diagram.
2001 Sea-Doo GTX RFI, 5524/5525/5553/5555 Cylinder, Exhaust Manifold | Sea-Doo Warehouse

 

[Larfme]

On a 2001 GTX RIF there are two springs on the engine RAVE valves, #10 and #15 on the attached diagram.
2001 Sea-Doo GTX RFI, 5524/5525/5553/5555 Cylinder, Exhaust Manifold | Sea-Doo Warehouse

It is for the bellow on the engine.
One of the bellow is deformed.

 

[Larfme]

How do I find my exact model number?

 

[mikidymac]

Last two digits of the HIN is the year.
Sure looks like a 2001 GTX RFI to me though.

 

[burtshaver2021]

Just following along with this thread, can someone tell me roughly where part number 10 is on the diagram? I can’t for the life of me see it. I see part 15 which is common, on every rave valve I have ever seen but can’t find part 10 which says it is a compression spring. Thanks

 

[Larfme]

Last two digits of the HIN is the year.
Sure looks like a 2001 GTX RFI to me though.

HIN ends in 00, so 2000 model. Thank you for the assistance.

 

[Larfme]

Just following along with this thread, can someone tell me roughly where part number 10 is on the diagram? I can’t for the life of me see it. I see part 15 which is common, on every rave valve I have ever seen but can’t find part 10 which says it is a compression spring. Thanks

This number 10?

 

[burtshaver2021]

View attachment 62326

This number 10?

Thank you

 

[Larfme]

I would check your compression.
I haven't heard of a waterbox causing this issue unless a baffle broke free but you should hear it rattling around.

Do you know the compression specs?

 

[mikidymac]

150 psi is perfect and at 120 psi the engine is done.