GP1800 IJSBA Stock Class Race Kit
- Stock 68 MPH @ 7,400 RPM
- Stock Class 83 MPH @ 8,650 RPM
Note: All testing performed with 1/3 tank of fuel, trim in neutral, sea level elevation, air temp 80-degrees F.
NOTICE- This kit is not designed for recreational use. IJSBA Stock Class rules limit the modification of the craft’s cooling system beyond what is included in this kit. Recreational applications should utilize RIVA SVHO Engine Cooling Upgrade Kit and RIVA Power Cooler Kit for maximum reliability.
This kit was developed to offer the maximum level of performance while complying with 2017 IJSBA Stock Class rules. Kit delivers a huge performance gain with simple bolt-on modifications! Expect awesome acceleration and a top speed increase of 15 MPH.
MaptunerX programmer is utilized to reflash your original ECU (Engine Control Unit) for added performance. Our race proven Stock Class tune is used by the World’s top racers and tuners.
Quickly and easily load our IJSBA Stock Class performance tune into your Yamaha ECU (engine control unit) eliminating the need to ship out your ECU for programming. Features a slick, full color, touch screen display. There is no limit to the number of vehicles or tunes you can reflash with the MaptunerX. Simply purchase one additional tuning license for each vehicle that you would like to program. The MaptunerX features a slick, full color, touch screen display for east operation. Includes full access to RIVA's world famous tuning library along with unmatched technical support. Easily switch between performance tunes and then back to stock settings if you wish.
RIVA Performance Power Filter is installed. Kit replaces restrictive factory intake system delivering improved throttle response and top-speed.
RIVA Engine Breather Upgrade Kit is installed. Eliminates power-robbing crankcase emissions from your engine's air intake. Increases horsepower by removing the engine's requirement to burn relatively non-combustible oil.
RIVA Valve Retainer Upgrade Kit is installed. Kit increases the reliability of your engine by reducing the possibility of valve float at high rpm.
Solas Concord Impeller is installed. New design incorporates a large blade area and superior hub design that deliver increased acceleration and top speed. Billet nose cone included.
RIVA Pump Seal Kit Dramatically reduces cavitation and prop spin. Location specific, molded inserts fill the voids in intake grate ramp that can bleed air into pump causing cavitation.
RIVA Top-Loader Intake Grate is installed.. Race bred design features oversized top loader wing and optimized inlet ramp for racing applications. Bulletproof stainless steel construction makes this grate virtually indestructible and eliminates the need for additional restrictive support bars.
RIVA Billet Pump Strainer is installed. Pump Strainer allows more water to enter your engine’s cooling system for lower operating temperatures. This is the only cooling modification allowed under IJSBA Stock Class rules.
RIVA Performance Ride Plate is installed. Our ride plate increases top speed and significantly enhances handling characteristics.
RIVA Pro-Series Sponsons are installed. Delivers dramatically improved handling & straight line stability with superior fin & backing plate design. Fully adjustable three position fin to control the amount of influence they have on the craft.
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