Yuusuke Hirasaka Reveals Insane Billet Fully-Adjustable SX-R 1500 Pump Nozzles


Besides a Facebook wall full of pictures of absolutely delicious-looking waffles (no, we’re not joking), Wakayama, Japan local and jet ski racer and parts developer, Yuusuke Hirasaka has been letting the world quietly know about an insane project he’s been working on for the past few years: complete adjustable, race-ready billet-aluminum CNC’ed pump nozzles for the new Kawasaki SX-R 1500.

Recently, Hirasaka revealed some rather interesting data after some extensive testing. He writes, “Many tests for a billet pump nozzles for 1500 SX-R! It started from the design of fluid simulation and repeated the real run test. There’s pretty good data on the run test here!” What is unique to these bolt-on nozzle kits is that the pump nozzle ring and steering nozzle ring are interchangeable. This way a rider can exchange each part to fit their preferred setting.

Hirasaka notes, the “acceleration [is] good, top speed [is] good, handling [is] good, more than one surprise to the performance!” Moreover, Hirasaka put great care into ensuring that the hardware couldn’t deform the nozzles when installed like competitor’s products. Over-tightening is no longer an issue, he assures, as replacement parts are all machined within very tight specifics. The data sheet included here shows how the different nozzles direct thrust depending on the sized rings. The Watercraft Journal is watching the development of these nozzles closely and will have more updates as they arrive.

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Kevin Shaw

Editor-in-Chief – kevin.shaw@shawgroupmedia.com Kevin Shaw is a decade-long powersports and automotive journalist whose love for things that go too fast has led him to launching The Watercraft Journal. Almost always found with stained hands and dirt under his fingernails, Kevin has an eye for the technical while keeping a eye out for beautiful photography and a great story.

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