I have a '92 Wave runner 650 that I'm trying to replace the impeller on. It appears that the whole jet drive needs to be removed to do this? I have all of the bolts out of the drive unit, but the driveshaft is not allowing removal. I have a crappy manual off eBay that says all I need to do is remove the bolts and the jet unit will come out. How do I get the driveshaft disconnected from the engine? Any tips to make this go a little easier? Thanks in advance?