1B. How high exactly do you have to raise the transom?
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).
2B. How far does the jet go down into the water?
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.
3B. What is SF & D?
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.
4B. How long does it take to change from prop to jet?
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.
5B. Can I put a short shaft on a long shaft motor so I won't have to raise the transom?
No. The jet drive shaft length must match the motor shaft length, or you would have to change the entire mid section of the motor.
6B. Will I have to raise my motor up on the transom for a jet?
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.
7B. Where should I set my Intake for max performance?
The first step is to trim your motor so that the main housing of the Jet is perfectly level, so that the nozzle of the pump shoots water straight back. Step two is to adjust the height of the motor. The toe of the Intake should be level or just slightly above the flow of water, whether that be the bottom of your boat, rear end of your splash plate or top of your tunnel. The Intake is designed with an angle to assist in water pickup. This will ensure maximum performance. Use this photo as an example.
8B. Do I need to buy a different Water Pump to fit my Jet?
No, With a few exceptions, our Jets use the stock Water Pump for the Outboard. Some Yamaha 4 stroke outboards as well as a couple of older Honda's do require modified water pumps. We always recommend using OEM cooling system components rather than aftermarket to ensure proper fitment and longevity.
9B. I want to build a Tunnel, Where do I begin?
The first thing you need to do is study our tunnel design. Click HERE to view that document. The next thing to be aware of is how wide to make your tunnel. The correct width of a Jet Tunnel is 13/4 the size of the Intake Shoe. The chart below will assist you.
10B. Is there a gasket between the Jet and the midsection?
The Jet does not use a gasket and does not require Silicone.