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Riva Racing Kawasaki Ultra 300X Stage 1 Kit
Riva Racing Kawasaki Ultra 300X Stage 1 Kit

Stock 66 MPH @ 7,500 RPM
Stage I Kit

73 MPH @ 7,900 RPM


Parts Price Total: $1,814.70
Price if Purchased as Kit: $1,725.00
You save $89.70!
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Kawasaki Ultra 250 Sponson Kit
RIVA Ultra 260 250 Pro-Series Sponson Kit
Delivers a significant improvement over the stock sponsons with superior blade design and backing plate. Includes a bulletproof mounting system that features three anchor points with billet inserts in sponson fins. Backing plate is precision machined from high strength billet aluminum that is anodized to prevent corrosion. Sponson depth and forward/aft position are adjustable to control the amount of influence they have on the craft. Easy installation requires no drilling.

Our Price: $389.95
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Kawasaki Ultra 300 Riva Pro-Series Waterbox
Kawasaki Ultra 300 Riva Pro-Series Waterbox
Developed on our Dyno and tested extensively on the water, this water box features radiused exhaust tubes and end caps for optimum exhaust flow. Unique exhaust baffle will increase the low-end power and mid-range pull of your Kawasaki Watercraft. Delivers up to 15hp on modified engines along with significant torque gains. High-strength aluminum construction will survive backfires and meltdowns. Powder coated to prevent corrosion. A must for modified motors. Includes detailed installation instructions.

2011 Ultra 300: Direct replacement for original water box. Use with stock exhaust outlet hose or RIVA Free Flow Exhaust Kit (part# RK16090-08).

`10~08 260/250 models: Direct replacement for original water box. Must be used with RIVA Free Flow Exhaust Kit (part# RK16090-08).

`07 250 models: Direct replacement for original water box. Use with RIVA Free Flow Exhaust Kit (part# RK16090).

Key Features:

  • Delivers up to 15hp on modified craft.
  • Machined hose flanges for reliable coupler retention.
  • Radiused exhaust tubes & end caps.
  • Powder coated to prevent corrosion.


Our Price: $374.95
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Kawasaki Ultra 300 Riva Performance Ride Plate
Kawasaki Ultra 300 Riva Performance Ride Plate
Our new Ultra 300 ride plate was designed to limit bow rise allowing your craft to drive through chop and corner like it's on rails. The plate is entirely redesigned from our Ultra 250/260 plate with a strong emphasis on rough water hook up and handling. Includes billet block-off for use when speedometer sender is removed.

Key Features:

  • Improves Hook up & Handling
  • Reduces Porpoising
  • Provides Quicker Planing
  • Integrated Reverse Gate Brackets
  • Powder Coated to Prevent Corrosion
  • Includes speedo sender block-off
  • IJSBA Race Legal


Our Price: $289.95
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Kawasaki Ultra 300 Riva Power Filter Kit
Kawasaki Ultra 300 Riva Power Filter Kit
Delivers greatly improved acceleration and increased top speed by replacing the restrictive stock intake system. The Power Filter feeds your supercharger with an increased volume of air via a large 4 diameter intake duct and oversized K&N filter element. Ducting is precision formed from a race proven composite that will not conduct heat to incoming air. Includes water-repellent pre-filter. IJSBA legal for all classes.

Our Price: $259.95
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Kawasaki Ultra 300 Riva TBM Intake Grate
Kawasaki Ultra 300 Riva TBM Intake Grate
Our fully tunable Top-Loader Intake Grate for the Ultra 300 features an adjustable foil & removable rear inlet chip. Developed through a joint effort with TBM Racing, this grate provides riders with the ability to tune for specific riding style or water conditions. The center foil has three positions or can be removed entirely. In flat water conditions it can be raised to the highest position increasing speed .5mph. Or be removed completely producing the same speed as the stock grate. The deeper center bars and removable rear inlet chip dramatically improve handling and hook up. The rear inlet chip can be removed or used with or without the center foil. Whether you're a closed course racer, offshore racer, or just a weekend warrior, our Tunable Top-Loader Intake Grate will enhance the hook up and handling of your Ultra 300.

Key Features:

  • Adjustable design allows rider to tune grate.
  • Dramatic increase in hook up & handling.
  • Improved top speed in rough water conditions.
  • No top speed loss on smooth water.
  • Race bred design provides excellent handling.
  • Significantly reduces cavitation.

Our Price: $249.95
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Kawasaki Ultra 300 Speed Control Override Module
Kawasaki Ultra 300 Riva Speed Control Override Module
The RIVA Speed Control Override Module removes the restrictive speed control function on Kawasaki Ultra 300X/LX models delivering significant increases in top speed with stock ECU. Easy to install module delivers 3~4mph to stock craft and allows further top speed gains through aftermarket modifications.

Key Features:

  • Removes restrictive speed limiter system.
  • Increases top speed utilizing stock ECU.
  • Works on all US model 2011 Ultra 300X & Ultra 300LX.
  • U.S. models will gain 3-4mph with no additional modifications.
  • Allows further top speed gains through aftermarket modifications.
  • All original dash functions are retained.
  • Easy plug-in installation.

Our Price: $199.95
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