POLARIS
AAT |
Adjust-A-Thrust for Yamaha PWC and Jet Boats
Stock Yamaha jet pumps are not the most efficient design in the world of PWC jet pumps. The stator hub is small, and the bowl of the exit nozzle is a huge. The introduction of 155 pump in ’95 on the Raider 1100 was great. A bigger pump moved more water, right? Yamaha moved more water through the 155 pump, but they did it just as inefficiently as the 144 pump! These pumps don’t do a very good job of maintaining water velocity through the pump. The Adjust-A-Thrust is larger than the stock tailcone, because of this there is less space to fill before water exits the pump, allowing a higher water velocity to be maintained through the pump. Maintaining water velocity really helps in rough water, it is easier to maintain a higher speed in rough water with the Adjust-A-Thrust installed. Most stock Yamaha nozzles have enough meat on them to bore out 2mm. If you want more low end, the stock exit nozzle can be bored, or you can install a lighter pitched impeller. If you ever tow skiers or boarders, this makes the job of getting them on plane much easier. Installation on the Yamaha pumps is the easiest of all. If your hands are small enough to fit into the exit nozzle, it takes about 10 minutes. The Adjust-A-Thrust also fits Yamaha jet boats. Our Yam2 and Yam3 units are angled to match the water flow of the 3 or 5 degree exit nozzles found on many Yamaha Models. |
