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This modification utilizes the RIVA Power Core Exhaust
Insert to replace the restrictive catalytic converter while
retaining the original exhaust system. The Power Core
increases peak horsepower and torque. Underhood temperatures
are dramatically lowered due to removal of catalytic
converter. Reduced temperatures in engine compartment allow
for use of RIVA Power Filter Flame Arrestor. Oil injection
system can be retained and you can now use standard Yamalube
Outboard Oil instead of special 2-W Yamaha Marine Oil. RIVA
Cat Temp Sensor Chip is installed to prevent warning lights
& beepers from activating when catalytic converter is
removed.
RIVA Pro-Series EFI Control Unit is installed. Unit provides
easy adjustment of fuel delivery to meet the needs of
modified EFI motors. Plugs directly into factory wiring
harness connectors for quick installation.
RIVA Cat Temp Sensor Chip is installed to prevent warning
lights & beepers from activating when a catalytic converter
is removed.
RIVA Power Filter Flame Arrestor is installed to increase
airflow to motor. Power Filter mounts easily to original
flame arrestor case and permits the removal of restrictive
air plenum chamber and internal OE flame arrestor screens
RIVA / Boyesen Reed Stuffers are installed into stock reed
cages with stock reed petals. Stuffers increase fuel / air
velocity through intake tract, resulting in increased
throttle response and acceleration.
RIVA Performance Cylinder Head Kit is installed. Head
features 48cc domes (including OEM gasket volume) producing
145-150psi compression (valves down). Girdled head design
securely clamps cylinder down preventing potential cylinder
cracking possible on modified motors.
(Note: We offer a modification service for your stock
cylinder head. This consists of decking and redesigning the
combustion chambers. This modification will produce
performance similar to the RIVA Performance Head, but does
not provide protection from cylinder cracking.)
RIVA GP1300R Free Flow Exhaust Kit is installed. Kit
replaces restrictive sound suppression system located
between waterbox and hull exit reducing backpressure and
engine operating temperatures.
RIVA / Solas 14/21 'Set-Back' Concord impeller is installed.
This impeller is specifically designed for the Stage II
GP1300R (`03~04 models) application using a 87mm exit
nozzle. RIVA GPR Billet Impeller Cone is included.
Original 87mm Yamaha GP1200R exit nozzle is installed
replacing the standard 85mm GP1300R exit nozzle. Larger exit
nozzle compliments the 14/21 Set-Back impeller maximizing
performance.
RIVA GPR Performance Ride Plate and Top-Loader Intake Grate
are installed. Our ride plate and intake grate combo
increase top speed and significantly enhance craft’s
handling characteristics. Prop spin and cavitation found
with the stock grate is greatly reduced along with the
modified GPR's tendency to drop on its nose when the
throttle is let off at high speeds.
RIVA GPR Pump Seal Kit is installed. Location specific
molded inserts are siliconed in to the voids of the OE pump
inlet shoe significantly reducing cavitation.
RIVA GP1300R Performance Trim Tabs are installed in place of
original trim tabs. Designed to trim craft up for increased
top speed and serve as a quick fix to unwanted proposing.
Tabs are 2.5 inches longer than stock.
RIVA GPR Pro-Series Adjustable Sponsons are installed.
Sponsons dramatically improve the handling of the GP1300R
with a superior blade design and mounting angle. Sponson
depth is adjustable to accommodate any riding style.
NOTE: Stage II modification is for competition use
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