You must raise the engine approximately 6 inches higher on the transom than with a propeller until the leading edge of the intake is flush with boat bottom.
About one hour; more the first time, less after you have done it. Raising the boat transom approximately six inches takes longer, depending on how you do it. If you plan to switch between prop and jet, depending on water conditions, winter, summer, etc., purchase a second cooling water pump so that each, the prop and jet drive, have one installed and you don’t have to transfer the pump back and forth.
Since it is necessary to raise the engine about six inches higher when attaching our jet drive, some people use a jack plate instead of fabricating a transom riser block. It is not necessary to use an hydraulic jack plate since once the correct height is established for the jet drive, it is not necessary to change it. Due to a four to five inch set back when using a jack plate, it is usually necessary to attach a twelve inch wide plate to extend the bottom of the boat back to the jet intake to control water height reaching the intake. We have a manual jack plate, part no. 1570, which includes this plate and provides eight inches of travel so that either the jet or propeller drive can be used without removing the motor.
This stands for Spot Facer and Drill kit. It is used to drill a hole and spot face a seat to receive a bolt from above at the rear of the engine midsection. This is not used on all motors. See the Jet Drive Kits list. This only applies to certain models which were manufactured before 2004. New Jets will not require a spotfacer drill kit.
The water intake grill slopes down to the rear to give a scooping effect. The leading edge is flush with the bottom of the boat. The trailing edge is about two inches lower.
The height is approximately six inches higher than with a propeller. It varies between different motors and boats. When the jet drive is on the motor, set the height so that the leading edge of the intake is flush with the boat bottom. Then test the boat and adjust the height, if necessary, as high as possible without air entering the pump and causing cavitation (slippage).