Low RPM

[David N]

I have a 98 gsx limited, I bought it about 1 1/2 months ago, i was unable to ride it until a week later and found that it had no power & the rpm wouldn't come up, I did some checking & found the rear cylinder wasen't getting fuel, I took it to a local boat repair that freinds said was very good with these things, they rebuilt the carbs and hooked water to it to test run it and found the head pipe broken, it took about a week to find a used pipe(ebay saved the day) found a $600.00 pipe for 90 bucks yippee, got everthing together & finally took a cold ride, got cold in Va, ski had plenty of power comming out of the water but the rpm doesn't seem to be were i think it should be at wot, it's only turning about 6500 rpm, according to seadoo manual the rev limiter is 7200, is there anything i can check, any advice would be greatly appreciated

Thanks David N

 

[Nate Surveyor]

Compression check it.

N

 

[kustomkarl]

You'll need a compression tester. Go to Auto Zone. I think they sell for like $25.00. The compression gage, will screw in the cylinder head in place of the spark plugs. To test compression, remove both spark plugs. Place spark plug caps on the plug cap studs near the cylinder head to ground the empty caps. This completes the circuit of the ignition electrical system and prevents any electrical problems from the caps being un grounded. Using the correct adapter for the threaded end of the tester,( same length of the spark plug threads length)screw in the tester in one plug hole. Hold the throttle wide open. Push the start button. Watch the compression gauge, when it peaks out at the most compression, let go the start button. Read the psi number. I would do it 3 times to be sure it is accurate. Check both cylinders the same way. The ideal compression is 150 psi per cylinder. If it is less, it's not a problem as long as they are close to being the same. If the psi is less than 90 it might need be time for a tear down and a rebuild. If the psi in 1 cylinder is say 140 psi and the other is 80 psi you need to tear down and repair. This difference is a lot then there is a problem. I hope this helps you.

Karl

 

[David N]

comp is 135 on both cylinders, i noticed a little bit of oil inside 1 of the raves, not sure if this is an issue so i ordered new bellows for both, engine was overhauled before i purchased ski, not sure exactly how many hours are on rebuild

thanks david n

 

[kustomkarl]

You might not need Bellows if there aren't any pin holes in them. It is possible that the rave valves just need a yearly cleaning of carbon deposits.

Karl