dz0k52

I just acquired (free) and 91 Seadoo XP. I was told it ran but one cylinder was "missing". A quick compression test shows no compression in the front cylinder. I guess I want to know is this a common problem? Do I have to pull the head off or is there something else to check first? ( I can see piston going up and down and can't see damage through spark plug hole.) Should I pull head off no matter what?
Also, I keep hearing of folks who get rid of the oil injection and mix their oil. I would hate to do that but is it a must? Is there a way to check the oil injection system? Is this machine worth all the fixing? The hull is okay but I don't want to be fixing this all the time.
Any advice would help....also a link to a repair manual would be awesome.
Thanks