ok i bought my first jet boat. it has a panther jet drive. i was told the drive was new two years ago and only went in the water twice. but after that it sat for the two years uncovered and there was a lot of water in the botem of the boat. after redoing the floor the trusses and the motor i got the boat in the water and there is a pretty good vibration. i know this could be a couple things. the motor out of balance. the motor and jet not aligned. the ujoint could be bad or the jet itself could be unballanced. How do i check the jet drive to see if it is bad? also there is a dip stick on the top of the jet right next to the bell housing on the motor. the gear oil in there looks a little milky and i cant seem to find a place to drain it. as far as the vibration issue i am having. it is there at idle then it goes away around 1200rpm and it is smooth up till about 3200rpm then it is back and pretty bad till about 3700rpm then it cleans up and the boat runs smooth. could this be a timing issue? anyway i am just trying to narrow this down. i guess i am going to start with changeing the ujoint since that is probably the easiest step. i dont know anything about jet drives so i dont even know where to start checking that thing out. any info would help out..

thanks
 tony

The stock Panther pump is a joke, in comparison to a Bad Berk. The  drive shaft is very small, say 5/16" to the Berk at 3/4" (Not realsizing). It is easy to bend the impeller shaft. I am in no way a Panther pump guy  Tom is the man on them right now. But they are a jet pump and there is not much to these pumps period.

no my panther makes a rod knock sound...hahah