96 Kawasaki sts 750 bogging after carb rebuild

[bigd46]

I rebuilt the carbs using SBT kits, after assembling the ski started ok and idled, when I hit the throttle it died.
After restarting the ski it would idle again, so I eased into the throttle and after 1/4 throttle it acts like it is running out of gas?? One time it actually went past the bog and reved up after playing with the throttle a lil.

All of this is while it is out of water, so I'm sure it will be worse in water, since it is a 30 min ride to the closest lake I'd like to see if I can get it close to running right.

Thanks in advance for any help!!
Dustin Mitchell

[bigd46]

Re: 96 Kawasaki sts 750 bogging after carb rebuild

Ok, I took it to the water today, once you ease into the throttle and get it past the initial bogging it runs great at full throttle! Rode it for an hour always with the same result! Still have no clue how to fix...

[Technical Support]

Re: 96 Kawasaki sts 750 bogging after carb rebuild

The pop-off springs may be wrong, did you do a pop-off test, if not install the old springs and see how it runs.

[bigd46]

Re: 96 Kawasaki sts 750 bogging after carb rebuild

I re-used the old springs, because I do not have a pop off tester.

[dereks1]

Re: 96 Kawasaki sts 750 bogging after carb rebuild

My 900 was doing something similar; it turned out that the compression was low in one of the cylinders. I haven't been able to test it after fixing the compression yet. My carbs are also freshly rebuilt.
Compression increases as the engine heats up; maybe this explains why it works sometimes. Also, compression increases as piston velocity increases; the air and fuel mixture has less time to leak by. This is consistent with good operation at high RPM.