Installing A Jet Works Flow Control

From: AJS Tech Staff
Date: 1/7/00

Comments

The Jet Works flow control valve is for personal watercraft that have aftermarket exhaust systems. The valve cuts off the water flow at idle and off idle speeds into the stinger where it builds up in the waterbox and exhaust hoses. This water normally has to be forced out upon sudden acceleration in order to get full exhaust flow.

At lower speeds, the water pressure in the water lines is low and the valve stops the flow to the stinger and raises the line pressure slightly. This improves response off the line and out of turns. At higher speeds, the water pressure rises and opens the valve to the stinger, allowing unrestricted flow of water. This creates a wall stream of water inside the stinger, thereby increasing the reflectability of the pipe in a similar way like a smaller diameter outlet would do.

Step 1: You have got the standard hose going from the headpipe to the stinger. Take note that most of the engine's cooling water is run through this hose after cooling the engine and headpipe.

Step 2: When you cut the hose for the flow control valve installation, shorten it approximately one and a half to two inches (This is the length of the Jetworks flow control valve).

Step 3: Place the flow control valve between the hose ends with the arrow pointing toward the stinger. Tighten clamps. Note there are two basic flow control valves available: One is internally adjustable by shims. The other is externally adjustable; you can turn the latter by hand without loosening the clamps.

Step 4: Normally you want to run at four and a half PSI (Triple pipe systems usually run two and a half PSI). The valve is adjustable so you can get it down as low as half a PSI or up to 16-17 pounds of pressure. You will rarely have to run anything over 8 PSI.

Last changed: February 02, 2011