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KPMI Racing Valve Spring Kit 40-40148



Model #40-40148

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KPMI valve springs are wound from Premium Kobe Super-Clean Chrome Silicon Wire. KPMI valve springs are heat-treated, stress relieved, and shot peened to insure maximum performance and life. Springs are engineered for each specific application using proprietary advanced spring design simulation, and analysis software. Engineers pay special attention to cam and spring harmonics, stress, mass, and operating rpm.


  • 80 Lbs of Seat Pressure / 205 Lbs at 0.435" Lift (Max)
  • Spring kit is designed for compatibility with the OEM integrated Seal/Base (OE# 3610212) where applicable
  • Lightweight heat treated Steel Retainer and Beehive Spring reduce reciprocating mass while providing the spring forces required by high performance boosted racing applications.

Other Part Numbers:
KPMI #191-22002

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KPMI (Kibblewhite Precision Machining) is a global manufacturer and distributor of valvetrain and specialized tools and components for the racing area. The KPMI product line comprises of Harley-Davidson motorcycles, sports bikes, valves, dirt bikes, ATVs, UTVs, tourers, cruisers, customs, and classics, as well as Jet Skis, Water Skis, and watercraft.

History of KPMI

James L. Kibblewhite formed the legacy of Kibblewhite Precision Machining, Inc. in 1939. In 1989, Jamesís son, William F. Kibblewhite, took over the operation. William Kibblewhite built on his father's good work and added a lot more products to the line of the automotive industry.


KPMI maintains a warehouse and supplies over 3,000 items to its consumers worldwide. There is no other company in the world that has such a wide range of products for the motorsports industry. Not only does KPMI manufacture finished products, but it also provides contract manufacturing services to OEMs and other third parties. Engineering, prototyping, and limited or full production runs are just some of the services they offer.


KPMI has five locations and a combined total of over 20,000 square feet of a machine shop, office, engineering, and warehouse space. KPMI has invested heavily in upgrading its operations during the last five years. As a company, they have eleven cutting-edge CNC lathes and other cutting-edge tools in their entire facility.

KPMI Quality

KPMI's objective is to supply consumers with products that function correctly the first time and deliver the best value for money in terms of reliability and performance. None of their products reaches final approval without first enduring a development flow procedure. Three signatures from engineering and one from production are required for final evaluations. This means that each product undergoes three independent assessments throughout its development process before a final product is launched.


Vivid Racing includes a wide collection of KPMI valve products, such as exhaust and intake valves, wrist bushing twins, service kits, seal valves, spring kits, and many more!

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