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R&D High Performance Valve Shim Kits (set of 16)
R&D High Performance Valve Shim Kits (set of 16)
Our Price: $32.95

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”. Each shim kit will have 16 shims per kit.
R&D High Performance Valve Stem Seal Kit
R&D High Performance Valve Stem Seal Kit
Our Price: $49.95

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.
RIVA Yamaha High Performance Valve Seals Kit
RIVA Yamaha High Performance Valve Seals Kit
Our Price: $59.95

Our high quality viton seals are extremely resistant to heat and abrasion. Superior sealing keeps unwanted oil from contaminating combustion chambers and prevents air leakage through valve guides. Precision seal removal & installation tool is available separately (part# RY19040-VST). Sold in sets of 16.
R&D High Performance Bottom Spring Retainer Cups
R&D High Performance Bottom Spring Retainer Cups
Our Price: $107.14

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.
RIVA Yamaha Valve Retainers Upgrade Kit
RIVA Valve Retainers Upgrade Kit - YAM 1.8L Eng
Our Price: $349.95

Our 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).

Dual Valve Spring Kit
R&D High Performance Dual Valve Spring Kit
Our Price: $449.95

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!
RIVA Racing Yamaha Engine Performance Valve Lifter Buckets
RIVA Racing Yamaha 1.8L Engine Performance Valve Lifter Buckets
Our Price: $459.95

RIVA Racing Yamaha 1.8L Engine Performance Valve Lifter Buckets

RIVA Performance Valve Lifter Buckets are a "must have" item when upgrading your engine's valve train. Designed to withstand the stress of increased valve spring tension and RPM in modified engines that can cause stock components to fail. Our lightweight valve lifter buckets are CNC machined from heat treated billet steel providing superior strength and durability. Order one kit per engine.
Riva RIVA Valve Train Upgrade Kit
RIVA Valve Train Upgrade Kit (SHO/FZR/FZS)
Our Price: $749.95

Our Valve Train Upgrade Kit increases 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.
Fits
FXSHO / FZR / FZS