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INTAKE
SYSTEMS
ENGINE/
GASKETS
EXHAUST
DRIVE LINE
HANDLING
ELECTRICAL
WATERLINE
/BILGE
STEERING
& CONTROLS
BODY
ACCESSORIES
SERVICE TOOLS
/HARDWARE
CHEMICAL
ULTRA 250X • EXHAUST SYSTEM & COMPONENTS
RIVA RACING
BLOCK-OFF VALVE COVER KAW 4-STROKE
ENGINE ULTRA 250X/LX; STX-15F/12F
The Ultra 250X Valve Cover Block-off Kit is designed to seal
off the ports on the valve cover when removing the emission
control system for racing applications. There are two major
benefits to removing the factory emissions system:
1) For racing applications it is recommended to remove all
necessary equipment from your craft for increased reliability
and reduced maintenance. This also cleans up plumbing in
the engine compartment providing a clean look.
2) To accurately monitor air/fuel ration for tuning purposes you
must remove the emissions system. The OEM system pumps
fresh air into the exhaust stream throwing off air/fuel ratio.
Plates are precision machined from billet aluminum and
anodized to prevent corrosion. Includes two block-off plates
and installation instructions.
Description
Part No.
Riva Racing Ultra 250X (07)/LX (07),
RK19090-VCB
STX-15F, STX-12F Exhaust Emissions Block-off Kit
R&D Ultra 250X (07)/LX (07), STX-15F,
331-25000
STX-12F Exhaust Emission Block-off Kit
TBM Ultra Ultra 250X (07) Valve Cover Block Offs
TBM137
RIVA PRO-SERIES ULTRA 250X WATER BOX
The Riva Racing Pro-Series Water Box delivers increased
horsepower and performance by reducing exhaust
restriction and back pressure. Features lightweight aluminum
construction and precise fit.
07 Models: Direct replacement for original water box. Use with
RIVA Free Flow Exhaust Kit RK16090.
08 Models: Direct replacement for original water box. Features
larger outlet (2-1/4“) compared to stock water box (1-3/4“).
Must be used with RIVA Free Flow Exhaust Kit RK16090-08.
Description
Part No.
RIVA Ultra 250X Pro-Series Water Box
RK16091
TBM RACING ULTRA
250X VALVE COVER
VENT BLOCK OFF
PLATE
Complete the valve cover
dress up with our Valve
Cover Vent Block off Plate.
This is the last piece to give your engine compartment the
ultra trick look.
Description
Part No.
TBM Ultra 250X Valve Cover Vent Block off Plate
TBM138
RIVA RACING
BILLET
ALUMINUM
EXHAUST TIP
FOR ULTRA
250X/LX,
STX-15F/12F
Quickly and easily add style to your craft with this direct
replacement for the stock, plastic exhaust tip. Made from billet
aluminum with laser etched graphics. Anodized to prevent cor-
rosion.
Description
Part No.
Riva Racing Billet Aluminum Exhaust Tip
RK16086
Ultra 250X/LX, STX-15F, STX-12F
Riva Racing Billet Aluminum Exhaust Outlet
RK160090-ET
Ultra 250X/LX, STX-15F, STX-12F
RIVA ULTRA 250X FREE FLOW EXHAUST KIT
Enables you to bypass or remove secondary muffler (weight
savings of +10lbs) improving engine performance by
reducing back pressure and harmful detonation. Formed
aluminum exhaust tube is lightweight and powder coated
to resist corrosion. Included billet exhaust tip (also sold
separately) with laser-etched graphics is anodized to prevent
corrosion. High temperature silicone couplers included with
detailed installation instructions.
Description
Part No.
Riva Free Flow Exhaust Kit ST-15F/12F
RK16085
Riva Free Flow Exhaust Kit
RK16090
Ultra 250X (07)/LX (07)
Riva Free Flow Exhaust Kit Ultra 250X (08)
RK16090-08*
*Note: Must use with Part # RS16091 Riva Racing Waterbox
RK16086