Bosch PPH6 C8 Series Especificaciones descargar pdf (Pagina 24)

YAMAHA

4 STROKE

INATKE

SYSTEM

ENGINE/

GASKETS

EXHAUST

DRIVE LINE

HANDLING

ELECTRICAL

WATERLINE

/BILGE

STEERING

& CONTROLS

BODY

ACC

SSO

RIE

ACCESSORIES

SERVICE TOOLS

/HARDWARE

CHEMICAL

YAMAHA FX-SHO/FZ/VXR/VXS • ENGINE

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.

RIVA Yamaha 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

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