The Kawasaki KZ650 oil pump turned out to be in perfect condition, but it needed some cleaning. To clean the oil pump properly I completely dismantled it, down to removing the strainer.
Since the original gasket is already more than forty years old, I decided to check how the aftermarket gasket for the oil pump fits. This gasket came with a set of gaskets I’ve bought earlier, even before I started working on the KZ650 engine. Turned out that it fits very poorly and that’s about all you have to know about aftermarket gaskets. In the best case the chance they fit properly is 50/50.
Not much could be said about it. All that is necessary is a clean table and clean engine oil. I do not recommend assembling an oil pump on the fabric as its fibers may get into the pump. First came the outer rotor.
After it I installed pump cover. I have nothing against cruciform screwdrivers and screws, be they of Philips, JIS or other types. Moreover, I have a set of such screws that I reinstalled more than 50 times and they are still intact. However, I also know pretty well that being untouched for a long time they could become PITA to unscrew. So I always replace them with Allen screws. In case of Philips or JIS round head screws – with Allen round head screws.