Our race bred Supercharger System for the Kawasaki STX-15F includes all necessary engine components to produce the ultimate 80mph closed course race craft. Kit contains the same specifications that Team Kawasaki won back-to-back Pro Runabout World Titles with. System produces over 300hp using VP MS109 race fuel (Jet X).

Forged racing pistons and base gasket spacer are installed to provide maximum reliability for supercharged application. A Vortech R-5 centrifugal supercharger is mounted to the rear of motor using supplied brackets. Supercharger is driven by a heavy duty belt via a driveline coupler pulley. Pressurized air from supercharger is cooled by a water-cooled intercooler prior to introduction into original throttle body. Boost pressure of 13lbs produces a power gain of approximately 100% over stock motor. Fuel delivery, engine timing and rev limit are optimized to match the increased demands of the modified engine via a race programmed Mitsubishi ECU that plugs directly into factory wiring harness. Fuel delivery is increased through installation of larger injectors, auxiliary fuel pump and auxiliary fuel pressure regulator.

RIVA Free Flow Exhaust Kit is installed to replace the restrictive sound suppression system located between waterbox and hull exit reducing backpressure and engine operating temperatures. Utilizes stock exhaust outlet and includes RIVA Billet Exhaust Tip.

R&D Pro2 Aquavein Intake Grate and Pro2 Ride Plate are installed. Top loader intake grate improves hook-up while reducing cavitation. Ride Plate design allows craft to plane faster increasing acceleration & top-speed as well as improving handling.
Skat-Trak Magnum Pump with Swirl Impeller is installed. Superior materials and design maximize increased power. Swirl Impeller reduces cavitation while producing improved acceleration and top-end speed. OE pump inlet shoe is modified to accept oversized pump.

Skat-Trak Auto-Trim nozzle kit is utilized. Interchangeable venturi rings allow fine tuning to match highly modified engine and aftermarket pump. Auto-Trim nozzle automatically trims craft down when handlebars are turned relieving rider from manually adjusting trim of nozzle on racecourse. Manual trim lever and cable are utilized for improved hole shot.

RIVA STX-F Pro-Series Adjustable Sponsons are installed. Sponsons dramatically improve handling with a superior blade design and mounting angle. Sponson depth is adjustable to accommodate any riding style.

Supercharger System includes all necessary hardware and detailed installation instructions.

FOR CLOSED COURSE RACING USE ONLY.