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YAMAHA
4 STROKE
INATKE
SYSTEMS
ENGINE/
GASKETS
EXHAUST DRIVE LINE
HANDLING
ELECTRICAL WATERLINE
/BILGE
STEERING
& CONTROLS
BODY
ACCESSORIES
SERVICE TOOLS
/HARDWARE
CHEMICAL
YAMAHA FX-SHO/FZ/VXR/VXS • ENGINE
©2012 Hot Products. All rights reserved.
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
RIVA YAMAHA 1.8L
ENGINE PERFORMANCE
VALVE SEALS
RIVA’s high quality viton seals are extremely resistant to heat and abrasion.
Superior sealing keeps unwanted oil from contaminating combustion cham-
bers and prevents air leakage through valve guides. A precision seal removal
& installation tool (RY19040-VST) is available separately. Sold in sets of 16.
Description
Part No.
RIVAYamaha 1.8L Engine Performance
RY19040-PVS
Valve Seals
RIVA YAMAHA
1.8L ENGINE
VALVE
RETAINER
UPGRADE KIT
RIVA’s Valve Retainer
Upgrade Kit increases the reliability of your engine by reducing the possibility
of valve float at high rpm. Includes 16 lightweight, precision-machined
titanium valve retainers. A must for IJSBA & APBA Stock Class race craft.
NOTE: For modified engines (Stage 3 & above) we recommend the complete
RIVA Valve Train Upgrade Kit (part # RY19040-VTU).
Description
Part No.
RIVA Yamaha 1.8L Engine Valve Retainer
RY19040-SRU
Upgrade Kit
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