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GP1200R Stage I Kit
Kit Performance Data
Stock 63-64mph @ 7150 rpm
Stage I Kit 68 mph @ 7250 rpm
Stage II Kit 70.5 mph @ 7280 rpm
Superstock Package 77-78 mph @ 7950 rpm
NOTE: All testing was performed with 1/3 tank of fuel (5 gal.) and trim in neutral position.
DESCRIPTION
QTY
 PART #
RIVA GP1200R Performance Cylinder Head Kit (66V)
1
 RY100388
RIVA Girdled Head Hardware Kit
1
 RY100389-H
RIVA GPR Free Flow Exhaust Kit
1
 RY1620
Solas Concord Impeller
1
 YF-CD-13/19
RIVA GPR Pump Seal Kit
1
 RY2520
RIVA GPR Top Loader Intake Grate
1
 RY22420
RIVA GPR Performance Ride Plate
1
 RY21013
   
    RY-RPM-12R-1
Our Price if Purchased as a Kit   Click Here
Kit Overview:

This modification utilizes stock exhaust system with catalytic converter in place. Stock flame arrestor case is retained, but internal screen and forward mounted plenum chamber are removed. We do not recommend the use of aftermarket flame arrestors in conjunction with stock exhaust system with catalytic converter. Our testing has proved that heat produced by the catalytic converter can cause engine damage when stock flame arrestor is removed. Stock oil injection system can be retained.

No internal carburetor modifications are performed. "Tamper Caps" are removed from high and low speed carburetor adjustment screws to optimize carb settings.

RIVA Performance Cylinder Head is installed. Head features 41cc domes that produce 145-150 psi compression (valves down). Girdled head design securely clamps cylinder down preventing potential cylinder cracking possible on modified motors.(Note: Riva also offers 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 GPR 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 GPR Ride Plate and GP1200R Top Loader Intake Grate are installed. Our rideplate and intake grate combo increase top speed and significantly enhance 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 Pro Pump Seal Kit is installed. Location specific molded inserts are siliconed into the voids of the OE pump inlet shoe significantly reducing cavitation.

RIVA GPR Performance Pump Cone is installed in place of stock pump cone on jet pump vein housing. Performance Pump Cone significantly reduces cavitation due to its innovative design and asymmetrical shape that matches 5-degree angle of stock Yamaha pump nozzle.

After extensive impeller testing we found the Solas 13/19 Concord to be the best all around impeller for stock thru Stage III GP1200R's. Riva GPR Billet Impeller Cone is installed in place of rubber Solas impeller cone that can blow out causing cavitation.

 
Secure On-Line Ordering Atlantic Jet Sports, LLC - Manahawkin, NJ
E-mail: sales@atlanticjetsports.com
Product descriptions, performance claims & testing results are that of the product manufacturer & not that of  Atlantic Jet Sports. Atlantic Jet Sports can not be held responsible for these claims.