1998 gsx wont rev above 5300

[Mraw]

Hi, I recently purchased a 98 gsxl, it has been sitting in a yard for a year. I took it to the water today after draining and refilling fluids. At first it wouldn't rev above 3500 but after running it for a while it now jumps quickly to 5300 rpm at WOT. I will clean the raves valves, any other ideas or suggestions considering the history of the ski is unknown? It starts up very quickly.

 

[Mraw]

Spark plugs are new

 

[Mraw]

Also when starting I get a 12v low warning. Also after a few minutes a loud long beep occurs. It has a new AGM battery

 

[JeremyD615]

There are quite a few possibilities, but the first place to start on any new to you ski is with the fuel system. Read the carb rebuild sticky, and start there.

 

[Mraw]

Hi, the ski now gets consistantly to 5500 rpm and will slowly crawl to 6100 after cleaning the carbs, the carbs were in good condition besides the filters being very plugged, rave valves have also been cleaned aweell as bypassing the fuel selector. Upon starting I get a 12v low warning and a long beep every 2-3 minutes

 

[JeremyD615]

A long continuous beep?

Have you looked at the water regulator on the exhaust expansion chamber? It controls the amount of water that is injected into the exhaust, and has an effect on top end rpm...

 

[Mraw]

Ok thank you I will definitely check that out. Compression using a Bosch tetser shows a hair under 120 with a almost fully charged battery. The 12v low warning was present while cranking. Also according to the chart that came with the battery 12.8 is supposed to be fully charged but after a 30 min ride it got only up to 12.65 after getting it home, yesterday when I took it out it got to 12.75 after getting it home. Could the rectifier be bad as well?

 

[Ckrawiec]

Ok thank you I will definitely check that out. Compression using a Bosch tetser shows a hair under 120 with a almost fully charged battery. The 12v low warning was present while cranking. Also according to the chart that came with the battery 12.8 is supposed to be fully charged but after a 30 min ride it got only up to 12.65 after getting it home, yesterday when I took it out it got to 12.75 after getting it home. Could the rectifier be bad as well?

Yes, the rectifier could be suspect....a functioning rectifier should keep voltage on the wires (while running) at 13.5 to 14.5 VDC thereabouts. A fully charged battery in a static state should be 12.6/7/8.

A long continuous beep is MOST LIKELY an OVERTEMP WARNING...check all your water cooling lines for free flowing condition, disconnect them and blow them out ( I had a 1 1/2" vegetation plug in one of my lines). Hooking the ski to a hose (for a short time with the ski running first before starting the water), the ski should be peeing out the back pretty strongly...otherwise, start looking for blockage.

 

[Ckrawiec]

Ok thank you I will definitely check that out. Compression using a Bosch tetser shows a hair under 120 with a almost fully charged battery. The 12v low warning was present while cranking. Also according to the chart that came with the battery 12.8 is supposed to be fully charged but after a 30 min ride it got only up to 12.65 after getting it home, yesterday when I took it out it got to 12.75 after getting it home. Could the rectifier be bad as well?

For your reading pleasure....FWIW

 

[Mraw]

Thank you, while riding water comes out of two holes in the rear. The long beep occurs every 2 to 3 minutes if the dess key is inserted, even if the engine is off. It beeped this morning every 2 to 3 when I checked compression.

 

[Ckrawiec]

Thank you, while riding water comes out of two holes in the rear. The long beep occurs every 2 to 3 minutes if the dess key is inserted, even if the engine is off. It beeped this morning every 2 to 3 when I checked compression.

???? - A long beep, with engine NOT running (so definately not an overtemp problem)....kinda points to:
1) Bad connection between lanyard cap and switch
2) wrong safety lanyard
3) salt water in safety lanyard
4) improper operation of MPEM or defective wiring harness
(that's directly from the DESS section of the manual)...for what that's worth

 

[Mraw]

Hi, I believe I found out my problem, one of the clamps on the muffler was loose and I tightened it and got to 6200 rpm with a slow crawl to 6400. When fogging the engine I realised that it was leaking water and smoke from in between the exhaust pipe gasket and the manifold. Have I caused any permanent damage running it with a water leak between the exhaust pipe and manifold?

 

[mikidymac]

No damage but it can spray water directly into the carbs.

That’s why seadoo added the “pipe diaper” and all the flaps and ducts on the airbox intake.

 

[Mraw]

Hi, I put on a new gasket and the water leak is gone. However today after riding it with the same issue I discovered a exhaust leak where the two pipe halves meet. I will be ordering a new copper gasket. Any tips for getting the new copper gasket on?