Sea doo Bogs down at full throttle.

[Joedgiordano]

I have a 2001 sea doo gts 717. Complete rebuild. Bottom and top end
New carb
New fuel lines
New mpem
Runs and starts beatiful
*BUT*
As soon as it gets on plane it bogs right down.

after ready many post about the same thing I found a guy who says it’s possibly getting some water in the cylinders at full throttle. So I unplugged the water inlet pipe and it does not bog. So I ripped the motor down to the cylinder base gasket and rebuild from there up.

same problem. Where is water coming in?

 

[mikidymac]

How are you sure that water is getting into the engine?

 

[Joedgiordano]

I’m not 100% sure. But when I unplug the water inlet pipe it doesn’t seem to do it.

 

[mikidymac]

What do your spark plugs look like?
Did you replace the fuel selector? Fuel strainer o-ring?
Are you sure the new carb has the correct jets and settings?

 

[Joedgiordano]

Spark plugs are new and look a bit wet. Not fouled but a bit wet. Fuel system has been taken apart and replaced everything except selector but I cleaned the selector and it seems to work fine. Fuel strainer and ring are new carb is new with factory jet settings. Also tries adjusting carb 1/4 past and back
it’s not even like its bogging. It gets to a certain point and just falls on its face.

 

[Joedgiordano]

Only thing I could also think of is I did install a aftermarket mpem.

 

[mikidymac]

Replace the selector, you can't clean them.

 

[Joedgiordano]

Compression 130 on both, but with a cheap gauge and not open throttle. But they are identical reading in both cylinders

 

[Joedgiordano]

I could just bypass it to test it right?

 

[Joedgiordano]

Just run fuel line from “RES” on tank to filter?

 

[Joedgiordano]

Ok. Ran fuel straight from tank to carb. No change.

 

[mikidymac]

Could definitely be the AM MPEM. I would get a good tested used OEM from Westside Powersports Seadoo.