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All Categories > Motorcycle Valvetrain Components > Honda® Motorcycle Valvetrain Components > Honda® XL™ 500S | XR™ 500/500R
1979 to 1984 
 

Honda® XL™ 500S | XR™ 500/500R
1979 to 1984

 
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3030015_HON_XL_XR600R_650L_Sprkit_08_LRB

Lightweight Racing Valve Spring Kits for Honda® XL™ 500S & XR™ 500/500R1979-1984

KPMI takes a scientific “System” approach when designing our Valve spring kits. Each component is designed to work with the others as part of the complete system. KPMI’s engineers use our proprietary design and simulation softwares, and draw on our 70+ years of design experience to create these systems. Our design, simulation, and manufacturing processes insure compatibility of the valve spring’s force and natural frequency with the cam profile, valvetrain mass, system harmonics, and the engine RPM. Our spring manufacturing partners are U.S based companies that are ISO certified. The Super-Clean Chrome Silicon valve spring wire we use is traceable back to Kobe Japan where some of the best spring wire in the ...

3030017_HON_XL_XR600R_650L_Spring_08_LRb

High Performance Spring Only Kits for Honda® XL™ 500S & XR™ 500/500R1979-1984

303003_HON_GB550_XR500R_Valve_LRB

Black Diamond™ Valves for Honda® XL™ 500S & XR™ 500/500R 1979-1984

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All KPMI Black Diamond™ stainless steel valves are impregnated by a special German process to a depth of .002”, with a surface build up of .0002”. This “Black Diamond™” process improves wear properties, reduces friction, and provides resistance to corrosion and wear that is superior to chrome and nickel electrolysis plating. Each valve is designed using Finite Element Analysis software, and profiles are tested on our computerized flow bench. Black Diamond™ Valves are light, strong, one piece forgings with profiles that provide excellent flow characteristics.

303050_HONXR650_Guide_09FAK_LRB

Valve Guides for Honda® XL™ 500S & XR™ 500/500R 1979-1984

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We choose to use the copper based C63000 nickel-aluminum bronze as a material to make valve guides because of its ideal characteristics for the application. The 4-5 percent nickel content provides superior resistance to wear, and the approximately 80 percent copper content delivers outstanding heat conductivity. KPMI guide profiles are designed to have minimal effect on the airstream while maintaining critical cross sectional thickness in high temperature areas, promoting high performance and endurance. The top portion of the guides are shortened when cam lift information available at the time of design shows that additional retainer to seal clearance is required.

700100018_Seals style4_LRB

Valve Guide Seals for Honda® XL™ 500S / XR™ 500/500R 1979-1984

KPMI Red 100% Viton® valve stem seals are designed to have optimum fitment, allow for maximum lift, and to give maximum life. KPMI Red valve stem seals are resistant to high temperatures, petroleum products and the corrosive gasses that are the by-products of combustion. These seals retain their ability to seal in situations where other materials could harden and allow oil to enter the combustion chamber causing detonation, carbon build up and a loss of power. The Red Ones are truly the racer’s choice.

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