Jacuzzi Jet Most Frequently Ask Questions

Jacuzzi 12YJ

Are parts available for my Jacuzzi 12YJ?

Yes all parts are available and most in stock.

My engine rpm has gone up and speed has gone down what is wrong?

#1 thing to check is the impeller clearance, excess clearance will allow the engine rpm to rise and the speed decrease due to too much clearance between the impeller and wear ring.  Solution = shim impeller

#2 item is there is debris in the jet causing cavitation. Solution is remove debris

How do I shim my impeller on the Jacuzzi 12YJ?

You shim the 12YJ impeller at the bearing housing, no need to remove impeller from jet drive. You will need to shim the impeller if you have more than .010" of clearance.  Complete details are available in our Service manual for $25.00.

Do I need the rudder on my Jacuzzi 12YJ?

Yes the rudder helps contorl the boat in slow and high-speed maneuvers. Note the rudder for the 12YJ is design to break if the rudder is grounded. This is to prevent the breakage of more expensive parts.  Rudders are in stock for $52.00.

I have excessive Jet noise, what is the cause?

#1 damaged thrust-bearing replace ASAP, #2 improper impeller to wear plate clearance. #3 cavitation cause by debris in the pump.

Should a 12YJ have some cavitation?

No, a 12YJ that is in good working condition should have not noticeable cavitation. Cavitation is normal for other jets on the market, but if your 12YJ has acceleration cavitation or high-speed cavitation there is something wrong with the jet drive.

What is the top speed of a 12YJ?

The average top speed of a 12YJ is 50 to 55 mph, can reach speeds of 60 mph.  The 12YJ has a 40% bigger nozzle than other jets, this allows for more thrust in the 0 to 35 mph range that other jets.

What is the max horsepower for the 12YJ?