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RIVA ULTRA VALVE TRAIN
UPGRADE KIT
Riva’s Valve Train Upgrade Kits increase the
reliability of your modified engine by reducing
the possibility of valve float at high rpm.
Includes lightweight, precision-machined tita-
nium valve retainers, racing valve springs,
and base washers.
Description
Part No.
RIVA Ultra Valve Train Upgrade Kit
RK19085-VTU
Ultra (All), STX-15F
RIVA VALVE COMPRESSION TOOL
Riva’s overhead Valve Compression Tool allows easy removal of valve springs
and keepers without removing cylinder head. Includes compression adapter to
pressurize cylinder keeping valves in place during removal of stock springs and
keepers. Fits both Yamaha 1.8L & Kawasaki 1.5L 4-stroke engines.
Description
Part No.
RIVA Valve Compression Tool
RY19040-VCT
Fits Kawasaki 1.5L 4-stroke & Yamaha 1.8L
RIVA/CARRILLO
CONNECTING RODS
Riva’s lightweight connecting rods
improve the reliability and performance of
turbocharged and supercharged watercraft
engines. Manufactured to our specifications
by Carrillo Industries, these rods are forged
from an ultra high-strength alloy and rated to
500+ horsepower. Unique H-beam design is
substantially stronger and lighter than OEM equipment, allowing your engine to rev
quicker and hold up to the punishing demands of high boost applications. Includes
high-strength silicon-bronze wrist pin bushing & race spec fasteners.
Description
Part No.
Riva/Carrillo Connecting Rod Set
RK19090-9M4449S
ULTRA 260/250/LX & STX-15F/12F (set of 4)
RIVA PRO-SERIES
4-STROKE CYLINDER
HEAD GASKETS
Riva’s Pro-Series Cylinder Head Gaskets were developed to withstand severe heat
& pressure generated by high-boost and high horsepower applications delivering
maximum reliability to your racing engine. Key Benefits Include:
• Three layer stainless construction for durability & corrosion resistance.
• Viton coated & embossed surfaces for maximum sealing.
• Unique design promotes even torque load & requires no re-torque.
Description
Part No.
Riva Pro-Series Head Gasket Standard
RK10090-CHG
Ultra 250/260
50
INTAKE
SYSTEMS
KAWASAKI
4 STROKE
ENGINE/
GASKETS
EXHAUST
DRIVE LINE
HANDLING
ELECTRICAL
WATERLINE
/BILGE
STEERING
& CONTROLS
BODY
ACCESSORIES
SERVICE TOOLS
/HARDWARE
CHEMICAL
ULTRA 250X/260X • ENGINE
RIVA PRO-SERIES 4-
STROKE RACING PISTONS
Riva’s forged racing pistons deliver maxi-
mum reliability and performance in high
boost & turbo applications. High strength
piston kits include premium ring package,
tool steel wrist pin & carbon steel wire locks.
Key Features Include:
• CNC machined from high strength/lightweight forgings.
• Optimized dome design for efficient combustion.
• Improved lubrication hole placement for reduced friction.
• Premium low friction ring package.
• High-strength tool steel wrist pins machined from special tool
steel bar stock & heat treated.
• Carbon steel wire locks.
• Direct replacement diameter plus 2 oversizes available.
9.5 to 1 Compression
Part No.
Ultra 260/250 (9.5:1/STD)
RK1000-15009.5
10.5 to 1 Compression
Part No.
Ultra 260/250 (10.5:1/STD)
RK1000-150010.5
R&D ULTRA 250
9.5-1 COMPRESSION
RATIO PISTON KIT
R&D Ultra Forged Racing Piston Kits have
been developed for the hard core race
enthusiasts or precision engine builders who
are looking to gain maximum horsepower and
reliability from their racing engines. R&D offers high quality forged aluminum,
heat treated, and CNC machined racing pistons in 9.5-1 compression ratios to
replace O.E.M. cast aluminum pistons known to break, crack, or shatter in high
performance, high heat conditions. High horsepower marine engines with high
boost pressures are more prone to have detonation over conventional racing
engines due to sustained loads. Forged pistons in marine applications are a must.
• Direct replacement piston kits for High H.P. applications
• High quality forged materials replace low performance cast
• Improved ring seal with Nascar Style ring sets
• Increased RPM’s and horsepower by reducing weight
• Works great with high boost compressor wheels and turbo kits
Description
Part No.
R&D Ultra 250 9.5-1 Compression Ratio Piston Kit
431-25095
RIVA PRO-SERIES
4-STROKE CYLINDER
HEAD STUD KITS
Riva’s ultra high strength cylinder head stud kit is essential equipment when
upgrading internal components on your high boost Yamaha engine. Precision
machined from premium grade 8740 alloy and heat treated to exacting tolerances,
these studs dramatically increase reliability & ease of maintenance.
Key Benefits Include:
• Superior material & heat treat process provide 10X better than OEM bolts.
• Studs provide improved alignment of cylinder head and gasket.
• More accurate & consistent torque loading.
• Helps prevent blown head gaskets and assures optimum engine sealing.
Description
Part No.
RIVA Pro-Series Cylinder Head Stud Kits
RK10085-HSK
Ultra (All), STX-15F