I currently own a Kawasaki 650 SX stand up jet-ski and I want to know how is the main bearings in the bottom crankcase is lubricated. There is a plastic filler cap on front of engine and wondering what if any oil should be put into it. I am wondering if I fill front case with oil how do I check the level of the oil as there is no dip stick. I currently mix the two-stroke oil with the petrol before putting into tank of Jet Ski.