96 Kawasaki STS 750 problem

klipster · 07-21-2009, 02:27 PM

Bill,
I am helping a friend with his jet ski. He brought it to me with the complaint that the ski didn't run very well. I found that one of the oil lines had broken off of the fitting on the mag carb. Ran a compression check and there was no compression on the mag cylinder and 140 psi on the pto cylinder. I rebuilt the top end of the motor for him. I went to ride it on Saturday and the engine will not achieve top rpm's and misfires. I suspected that the fuel pump on the pto carb was weak but after inspection it appears fine. No leaks. Now I am beginning to suspect that I have a pressure leak somewhere in the engine. Is there any reccomended pressure that you should get from the pulse line? This particular engine has a water drain on it. Did these water drains leak often? Any help would be appreciated. Thanks
Regards,
David

Bill O'Neal · 07-21-2009, 07:09 PM

You think an air leak is making it misfire ?

To pressure test a motor pump between 5 and 8 psi into the pulse line fitting after blocking off the exhaust manifold and the intake manifold. See if it will hold it. And yes, water drains can leak.

I'm thnking weak stator myself, but who knows ?

klipster · 07-24-2009, 02:13 PM

How do I test the stator and what am I looking for?

I am not familiar with Kawasaki's because I have always had Sea Doo's but the water from the discharge on the port side seems unusually warm. It doesn't burn you but you definitely notice it when the spray hits you while riding. Is this normal? Temperature light does not indicate overheating but I don't trust it.

Bill O'Neal · 07-24-2009, 07:05 PM

If that water coming out is steam, you have a blown head gasket. Other than that I know little of what the temp should feel like.
You probably would get better advice in the Kawasaki forums. I do not have the manual to tell you how to test the stator. I do not know the values for the test.

klipster · 07-25-2009, 11:20 PM

Bill,
I feel like a DA. It was a defective spark plug. Once I found the problem and got both cylinders firing, the water coming out of the starboard discharge port seemed to be a little cooler. Could raw fuel burning in the pipe cause the warmer discharge water? Thanks for all your help.
Regards,
David

Bill O'Neal · 07-27-2009, 01:40 PM

I doubt there was much of a change in water temps other than your imagination, but hey, I don't know everything If it works, quit fretting over it and go have some fun with it. I have no explination of why water temps would drop if both clyinders are now firing. Seems illogical to me.