1996 Seadoo gti issue

[cbn70]

Hello.
Just got My Seadoo gti out of storage. And it needs a bit of work before it goes back into the water. Last year it seemed to run ok but once it hit around 3/4 throttle or maybe a bit less it would not really gain any more rpm or speed. I am going to check the timing to see if it is set correctly(I installed a new crank in it and lined up the timing as close as I could to where it was previously). As well it appears that the impeller had a big “wobble” in it. Think the previous owner put a big rock or something through the pump. Could this be causing cavitation at the higher rpm? I know I will be ordering a new Seadoo impellor to remedy that situation. Don’t think it is jetting plugs are dark but not wet when I did a jetting run. What does
Everyone
Think?

 

[Spider4real]

Based on my experience, cavitation would cause RPMs to shoot up, not stop.

What is the max rpm you are hitting? Have you checked compression?

 

[mikidymac]

Yes, cavitation will cause high RPM but less to no forward speed. It is exactly like a slipping clutch.

 

[cbn70]

Compression is about 140 for each cylinder. From your responses it does not sound like cavitation then

 

[cbn70]

Not sure of rpm. Did not have a tach hooked ip

 

[Spider4real]

Compression is good. I would fix the impeller then water test again and check rpms to see if you are hitting the max. It should be hitting 7000 rpm (plus / minus 50) per the seadoo manual. If you don't have a tach then test the max speed with a GPS to see were you are at. Should be around 48-50 mph assuming everything is stock and pump is in good shape.

 

[cbn70]

impellor is on order. Now just need some good weather. still ice on the lake.