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INTAKE
SYSTEMS
YAMAHA
4 STROKE
ENGINE/
GASKETS
EXHAUST
DRIVE LINE
HANDLING
ELECTRICAL
WATERLINE
/BILGE
STEERING
& CONTROLS
BODY
ACCESSORIES
SERVICE TOOLS
/HARDWARE
CHEMICAL
YAMAHA FX-SHO & FZ • ENGINE
RIVA 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 titanium valve
retainers, racing valve springs, and base washers.
Description
Part No.
RIVA FX-SHO/FZR/FZS Valve Train Upgrade Kit
RY19040-VTU
R&D HIGH PERFORMANCE
DUAL VALVE SPRING KIT
R&D has developed an economical solution for
upgrading the valve train by offering a series of
upgrade parts that will work great with the O.E.M.
retainer and valve seals. R&D has documented
that the seat tension or pressure on the stock springs is a low 52-55 pounds, and
coil bind on the stock springs occurs .050” after full lift on the stock cams. As an
industry rule or standard, as boost levels are increased to the engine, the valve
spring seat pressure should be increased 1-2 pounds per pound of boost. As an
industry rule, as RPM'S are increased, the spring pressure at full lift should be
increased as well to reduce or eliminate valve float at high rpm frequencies.With
the stock springs “short lift travel” shimming is NOT an option. Valve Springs MUST
be upgraded. Also to consider is valve spring travel at full cam lift, and to have
enough spring clearance freedom to run high performance camshafts or add
additional spring tension pressures without coil bind issues. The R&D spring kit
parts were developed and used with stock retainers during the 2009 season and
have proven their performance with an APBA/IJSBA Pro Open National
Championship. R&D dual springs are a “lightweight design” and manufactured
from ultra clean, high tensile material with multi step surface treatments to improve
fatigue strength and reliability. NOTE: R&D Spring Kits must use the R&D Bottom
Spring Retainer Cups kit Pt. # 612-93006 for proper assembly and seat pressures!
Engine Tuning Features
• 70-75 pounds at seat, 140-150 pounds at full lift (standard spec.)
• Shim friendly, add R&D spring collar base shims to add 2 pounds per .010 shim
• Allows the use of higher lift cams (up to +.080)
• Linear spring pressure curve allows smooth precision valve control
• High performance materials and surface finishes add to reliability
Description
Part No.
R&D High Perf Dual Valve Spring Kit (16 per kit)
612-93001
R&D HIGH PERFORMANCE
VALVE SHIM KIT
The R&D spring base collar “shims” offer precision
valve spring tension shimming to fine tune spring
seat pressures based on boost pressures the engine will run at. The R&D shim
kits are offered in the thicknesses of .010”, .020”, and .030”.
Description
Part No.
R&D .010” Thick Shim Kit (set of 16)
612-93003
R&D .020” Thick Shim Kit (set of 16)
612-93004
R&D .030” Thick Shim Kit (set of 16)
612-93005
R&D HIGH PERFORMANCE
BOTTOM SPRING
RETAINER CUPS
R&D spring retainer cups will install under the R&D valve spring and support and
house the bottom of the spring securely. The R&D Spring Retainer Cups must be
used with the R&D spring kits for proper assembly. Use R&D Valve Spring Shim
Kits to fine tune valve spring seat pressure.
Description
Part No.
R&D High Perf Bottom Spring Retainer Cups (set of 16)
612-93006
R&D HIGH PERFORMANCE
VALVE STEM SEAL KIT
R&D offers High Performance Valve Stem Seal Kits
manufactured from only the best high quality Viton
rubber materials that will resist high valve guide and oil temperatures to maintain
a good valve seal in all high rpm, high performance applications.When valve
springs are changed out or periodic head service work is being performed, trust
R&D Valve Stem Seal Kits at any performance level.
Description
Part No.
R&D High Performance Valve Stem Seal Kit
612-93007
R&D VALVE STEM
CONCENTRICITY GAUGE
The R&D Valve Stem Concentricity Gauge
is a testing tool to check the roundness and
trueness of valves. Small valves can distort
or bend from heat produced in high
performance supercharged or turbo charged
engines. To achieve a perfect seal on the
seat the valve needs to be concentric and true in every dimension. Gauge is fully
adjustable to accommodate a variety of valve sizes and features a rigid, positive
stop that can be set once and the trueness for an entire set of valves can be
measured. Kit comes complete with dial indicator accurate to .001”. This is a must
have tool for any engine builder to get the most out of your high performance 4
stroke engine.
Description
Part No.
R&D Valve Stem Concentricity Gauge
612-80010
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 Yamaha 1.8L & Kawasaki 1.5L 4-stroke
FZR VALVE SPRING
COMPRESSION TOOL
KIT
The R&D Valve Spring Compression
Tool Kit allows easy removal of the
intake or exhaust valve springs and
keepers without removing the cylinder
head. R&D recommends using the compression adapter from a compression
gauge kit to pressurize cylinder keeping valves in place during removal of springs
and keepers.
Description
Part No.
FZR Valve Spring Compression Tool Kit
612-92013