Yamaha - 3.3l water pressure h/w kit - 6P2-83728-00-00Yamaha Water Pressure Hardware Kit 3. 3L Cooling System Component 6P2 83728 00 00 Overview If youre running a 3. 3L Yamaha, keeping an eye on water pressure isnt optionalit tells you exactly how your cooling system is doing. Ive rigged setups where adding a proper pressure kit made it a lot easier to catch issues before they turned into overheating problems. When everythings installed right, you get real time feedback and a lot more confidence pushing