i have a 1996 seadoo gtx i just replaced the motor with a rebuilt one from a local seadoo mechanic that builds them on the side also replaced all the fuel lines and rebuilt the carbs with oem carb kits the issue i was having is under throttle around 4000 rpm it starts to stutter and wont excelerate but if i let off the the throttle idles perfectly was going through a lot of fuel and some times it jumps right up on plane and runs very well so the seadoo dealer asked if i replaced the needle and seats as the ski sat for ten years before i got it so i replaced the needle and seats and the dealer set the pop off pressure for me i put the carbs back on and ran it for an hour yesterday and no issues today i took it out and it ran fine for about 20 min and then under throttle it started to stumble like it was missing i brought it back to idle again idled fine let it idle and tried a few times to excelerate would go to 4000 then stumble then i hit the throttle again jumped right up on plane and ran fine for an hour or so could not duplicate the issue running fine could it be the rave valves hanging up