An outboard motor needs water running through it when running. When the boat is on the water, the engine draws water into the outboard … But you have to provide water to the engine behind it by removing the supply hose from the pump body and hooking up … You can use specially designed products that are available that will fit an outboard or inboard water intake to act as if the boat was sitting in water. Yes, a Berkeley jet can run dry, there is nothing in it that needs to be wet. Mercury sells a flushing adapter that uses a 3/8" National Course bolt thread on one end and a female garden hose end on the other. Jet boats go an average of 25 mph but can go way beyond that if the water jets are more efficient (around 60 mph). With most boats, it isn’t necessary to have ear protection while you’re out on the water. Re: running motor with water hose Depends on your drive. Unfortunately, that’s not necessarily the case with Jet boats. When the water is reduced to the headers so they don't milk up the oil, you are cutting down even further the amount of water that can get out of the engine and the engine block pressure goes up even more as a result. My next question is do I need to run another hose to the pump and whats the process. This is a flushing fitting hole. To control excessive header water the jet boater will install a header water control valve somewhere in front of the header tee. An Alpha or pre alpha unit or Cobra you need to run on muffs to keep water to the impeller or you will have to replace the whole pump assy in the drive just under $200 not counting labor. As it turns out, you can safely start your boat engine while out of the water as long as you have a properly connected water supply, like a garden hose attached to the water intake vent. When a boat comes onto plane it rises up out of the water substantially, and this can reduce draft by a matter of several inches or even more. Jet skis have an average speed of 65 mph. A: Running the Berkeley out of the water: A Berkeley pump can be run out of the water as it has a greased thrust bearing and lubricated tailshaft bushings. A set of outboard rabbit ears is used to bring water to the intake from your hose to test an outboard while it is out of the water. I would like to run my boat so I can trouble shoot some probelms but I want to make sure Iam not going to cause any more problems to my boat, in the picture below is that the correct spot to hook up the hose and if so whats the process of starting the engine. Understanding how to run safely and perform on-the-water maintenance is critical if you want to avoid accidents, bodily injury and consistently bring your jet boat back to trailer in tip top shape. Tilting the engine up a bit can reduce running draft even further. They show hooking up a garden hose to the bolt hole by the grease zerk on the jet pump and running the engine this way out of the water. Just picked up an 04 g3 1652 with an 04 Yamaha 60/40. I have been reading through all of the maintenance articles online and came across one on snyder boats website on winterizing. Off The Water Maintenance/Repairs : To flush the motor, there is a 3/8" stainless bolt head on the LH side just below the juncture of the motor's midsection and where it bolts to the jet lower unit.