Spunbearing
Member
Hi everyone,
I am hoping you can help me out with a problem I am having with my 1993 SeaDoo XP. This thing has been my go-to-Doo when my other ones need work and now it is the one acting up. It runs fine on the hose but when I put it in the water anything over 1/4-1/3 throttle makes it sound like one of the cylinders is missing. If I give it full throttle it accelerates for about 1 second like it is running perfect and then goes back to sounding like one cylinder is misfiring. It idles and starts without any issues. I think it is not getting enough fuel to the MAG side carb due to fuel starvation but it could be anything at this point.
Here is some back story, it was fogged and winterized but left in storage due to life events for 4 years. Last year I took it out for a run for the first time and it ran amazing on the hose but in the water it was bogging (pop-pop noise, engine misfire) when giving more then 1/3rd throttle. I pulled it out and cleaned the carbs over the winter. I used my ultrasonic cleaner, carb picks and compressed air to make sure it was spotless. I expected to see them gummed up but they were actually clean to start with. The Low-speed needle is 1-1/4 turns out, high-speed is closed and pop-off set to 26# per factory settings. Jets and intake are stock factory size. When I originally picked up the unit I rebuilt the carbs with Mikuni rebuild kits but kept the original float springs because the ones in the rebuilt kits are wrong. The filters in the carbs had some sediment in them so I cleaned them out. I put the carbs back and but I am still having the same problem. I forgot about the spin off fuel filter so I pulled that out and it was clean but the o-ring in the filter popped out of the groove and would not go in because it has expanded. A new one is being ordered so I can reinstall it. I also removed the fuel selector switch and verified that it is clean. All of the grey fuel lines were replaced a long time ago with fuel injection lines and the gas tank holds pressure. The fuel tank pickup with fuel level sensor is also less than 10 year old. I am using no ethanol gas but I did not drain the little gas left in the tank, instead adding fresh gas with it. I thought it could be old gas but at this point I have run about 10 gallons through it with no change in the throttle response. The gas in the tank does not smell “old” or look discolored, there is no sediment or buildup at the bottom of the tank. Changing the fuel selector to/from RES has no impact on the performance.
Thanks,
Spunbearing
I am hoping you can help me out with a problem I am having with my 1993 SeaDoo XP. This thing has been my go-to-Doo when my other ones need work and now it is the one acting up. It runs fine on the hose but when I put it in the water anything over 1/4-1/3 throttle makes it sound like one of the cylinders is missing. If I give it full throttle it accelerates for about 1 second like it is running perfect and then goes back to sounding like one cylinder is misfiring. It idles and starts without any issues. I think it is not getting enough fuel to the MAG side carb due to fuel starvation but it could be anything at this point.
Here is some back story, it was fogged and winterized but left in storage due to life events for 4 years. Last year I took it out for a run for the first time and it ran amazing on the hose but in the water it was bogging (pop-pop noise, engine misfire) when giving more then 1/3rd throttle. I pulled it out and cleaned the carbs over the winter. I used my ultrasonic cleaner, carb picks and compressed air to make sure it was spotless. I expected to see them gummed up but they were actually clean to start with. The Low-speed needle is 1-1/4 turns out, high-speed is closed and pop-off set to 26# per factory settings. Jets and intake are stock factory size. When I originally picked up the unit I rebuilt the carbs with Mikuni rebuild kits but kept the original float springs because the ones in the rebuilt kits are wrong. The filters in the carbs had some sediment in them so I cleaned them out. I put the carbs back and but I am still having the same problem. I forgot about the spin off fuel filter so I pulled that out and it was clean but the o-ring in the filter popped out of the groove and would not go in because it has expanded. A new one is being ordered so I can reinstall it. I also removed the fuel selector switch and verified that it is clean. All of the grey fuel lines were replaced a long time ago with fuel injection lines and the gas tank holds pressure. The fuel tank pickup with fuel level sensor is also less than 10 year old. I am using no ethanol gas but I did not drain the little gas left in the tank, instead adding fresh gas with it. I thought it could be old gas but at this point I have run about 10 gallons through it with no change in the throttle response. The gas in the tank does not smell “old” or look discolored, there is no sediment or buildup at the bottom of the tank. Changing the fuel selector to/from RES has no impact on the performance.
Thanks,
Spunbearing