These superior US-made Kibblewhite Black Diamond exhaust valves are the correct fitment for the Triumph T100 models from 1967 through the end of production of the T100R model in 1973. Available in both standard 1.325″ and oversize 1.375″ head diameters.
Kibblewhite Black Diamond exhaust valves feature a proprietary impregnated coating to a depth of .002″ that improves wear properties, reduces friction, and provides resistance to corrosion and wear that is superior to traditional nickel-plated valves. Stem diameters are .3095″, overall length is 3.425″ for standard & 3.445 for oversize, and the tulip radius is 27 degrees.
The exhaust valves allow the expulsion of the combustion gases from the combustion chamber when opened. It is critical the valve seats and valve faces make a seal when the valves are closed to maximize compression. The valve stems must have the correct clearance within the valve guides to be properly lubricated and dissipate heat.
The rocker boxes and cylinder head must be removed to access the valvetrain. A valve spring compressor is employed to compress the springs far enough to remove the retaining collets from the top collars. Once fitted into the valve guides, the replacement valves will require “lapping-in” to the valve seats. Refer to the factory workshop manual for the complete instructions. Replacing valves is a multi-step procedure and may be best done by a professional machinist.
FROM KIBBLEWHITE FROM KIBBLEWHITE 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.
STANDARD: HEAD DIAMETER….1.325″ / 33.66MM. STEM DIAMETER…..0.3095″. TULIP…..27 º radius. OVERALL LENGTH…..3.425″
OVERSIZE: HEAD DIAMETER…..1.375″ / 34.93MM. STEM DIAMETER…..0.3095″. TULIP…..27 º radius. OVERALL LENGTH…..3.445″