The JETWORKS FLOW CONTROL VALVE provides improved throttle response and much quicker starts by drying out your water box at low rpm and idle sppeds. Tests have shown an average acceleration improvement of 12 feet over a non-equipped model in the first 50 feet. Allows unrestricted water flow to the stinger for better top speed. Yet it controls the amount of water at low speeds for better response. It also allows for an easier tuning of the carburetors. It does not interfere with normal engine or exhaust pipe cooling and is compatible with all electronic water injection systems.

In a race start situation, the craft is under a slight load while waiting the start, water fills up the water box and exhaust hoses. Upon sudden acceleration all of this water must be forced out quickly before full exhaust flow can occur. During this time the craft feels a slight hesitation and/or sluggishness, especially when the water box is mounted up front and has a rear exhaust. Improves response through turns when the throttle is let off for a split second. This drys out the water box while at the same time raising the water pressure slightly in the head pipe of the exhaust. This raised water pressure allows the water injection orifices and/or nozzles to work quicker and more effectively.

Two models are available: The standard flow control valve is preset at 3.5p.s.i. and is adjustable by adding the supplied stainless steel shims to increase the spring tension. The Pro-Series valve is externally adjustable by turning the outer housing by hand. Pressure can be tested with a pop off gauge. Both models feature a positive sealing viton on metal seals with a precision calibrated, variable rate spring. This allows for true water flow and pressure management of multiple water lines and dedicated cooling line applications.

The Jet Works adapter kit is designed to improve bottom end response and get the craft into high speed quickly and gives more acceleration out of turns. By allowing the craft to get up on plane quicker, less time is spent pushing or plowing the craft through the water. This is especially true on the XL models. The quicker you get the craft up and on the water, the quicker the boat will accelerate because you can use or free up the horsepower that is  being used up to displace and push aside the water. The water drag - frictional loss of the wetted surface - is reduced and this is when the craft actually starts to really accelerate. One of the main reasons the GPR and XL are sluggish or experience a lag on acceleration is due to the large amounts of water that enter the water box. This water backs up in the water box and hoses to be purged or blown out upon acceleration, The water box can hold a considerable amount of water. This can not be purged out easily since the hoses and resonators are located at a higher level then the water box. The water must be pushed upward and through the resonators. Since the water box is fairly large it can hold a good amount of water. It is not until all this water is blown out that the exhaust can be free flowing. During all this time the craft is trying to get on plane which causes more load on the engine and further lengthens the process. If you pull skiers, then you know the drag created when pulling a skier out of the water. Once the boat is on plane and the skier is up, this drag is significantly reduced. So, getting the boat on plane quicker will mean less time spent in the inefficient transition period just before planing. This allows you to pull up the skier faster and allows the craft to handle even heavier skiers.
There are two kits available:
The 23-0140 kit requires the removal of the cooling system overheat sensor. The 23-0141 kit retains the overheat sensor but requires you to drill and tap the water jacket of the exhaust system and install a calibrated bypass fitting on the craft. This kit comes complete with all the bypass fittings, hoses, tees and clamps