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I think a grease fitting in the cone is a great idea. i redid thhe pump on my seadoo a few years back and i filled the entire pump with grease and then the con as well until it looked like an ice cream cone so the bearings are always in grease. no problems since.
Yes I think they all have a cone on the end of your prop that you unscrew and grease the bearing. I know on my ultra250x people talk about the bearing going bad and when it does it breaks the crank on the motor Too
I modified mine with a drain plug and use gear oil. It is known mod in the PWC world. The grease needs to be API#0 which is quite thin grease that flows. Some use a mix of amsoil grease and amsoil gear oil to make a slurry to replace the API#0 grease. You can tell I researched it to death before I did the oil mod. Not sure that you can put a grease nipple on since the trapped air would get forced out the seals. cam.
I went with the gear oil mod when I rebuilt mine. There are also topics where people put a plug in the cone so the oil can be changed easily but you still have to pull the pump to do it.