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​​​KPMI® H.T. Steel Cylinder Stud Kit for Suzuki® LT-Z 400 2003-2008 / D-RZ400E / S / SM 2000-2019 


• Nuts are machined from billet high tensile steel and heat treated
• Studs are heat treated 180,000 PSI aircraft alloy steel
• Both nut and stud have rolled threads for the strongest possible threads
• Both nut and stud are black oxide treated for enhanced corrosion resistance


To learn more about these Kibblewhite®  H.T. Steel Cylinder Stud Kit and  other valvetrain related components for the various models,  go to  
Suzuki® LT-Z™ 400 2003-2008
Suzuki® D-RZ™ 400E/ S/ SM 2000-2019

Lightweight Racing Valve Spring Kit and Components for Indian ® Scout™ 4V 1200's 2015-2019


The KPMI® spring kit includes dual springs designed with attention paid to natural frequencies to avoid cam harmonics, FEA designed lightweight titanium retainers to reduce reciprocating mass, and hardened steel bases to keep the spring where it belongs. This kit is capable of handling high RPM and up to .450 valve lift!
Coupling this kit with KPMI® Black Diamond™ Valves and Manganese bronze guides has proven to be a race winning combination. 

•  These spring kits are compatible with the OEM tappet lash adjustment system and the KPMI® shim conversion tappets
•  The seals included in these kits are intended for use with OEM guides. Please use KPMI® P/N 71016-8 when installing

    KPMI® guides

We choose to use the copper based C63000 nickel-aluminum bronze as a material to make our bronze valve guides because of its ideal characteristics for the application. The 5% 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, which promotes high performance and endurance.


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 lightweight, strong, one piece forgings with profiles that provide excellent flow characteristics.


To learn more about these Kibblewhite®  Lightweight Racing Spring Kit and other valvetrain related components,  go to 

​Indian® Scout™ 4V 1200's 2015-2019


​​​KPMI® H.T. Steel Cylinder Stud Kit for Suzuki® GXS-R 750 and 1000 Applications 


• Nuts are machined from billet high tensile steel and heat treated
• Studs are heat treated 180,000 PSI aircraft alloy steel
• Both nut and stud have rolled threads for the strongest possible threads
• Both nut and stud are black oxide treated for enhanced corrosion resistance


To learn more about these Kibblewhite®  H.T. Steel Cylinder Stud Kit and  other valvetrain related components for the various models,  go to  
Suzuki® GXS-R 750 2004-2005

Suzuki® GXS-R 1000 2001-2004

Suzuki® GXS-R 1000 2005-2008

Suzuki® GXS-R 1000 2009-2016

KPMI® H.T. Steel Cylinder Kits for Polaris® Various 570's and 900-1000's Applications 


•  Each kit include studs, nuts and washers to replace the OEM bolt
•  Nuts are machined from billet high tensile steel and heat treated
•  Studs are heat treated 180,000 PSI aircraft alloy steel
•  Both nut and stud have rolled threads for the strongest possible threads
•  All studs, nuts and washers are black oxide treated for enhanced corrosion resistance



To learn more about these Kibblewhite®  H.T. Steel Cylinder Stud Kit and  other valvetrain related components for the various models,  go to 
Polaris® Various 570's 2012-2015

Polaris® RZR™ XP 900 2011-2012
Polaris® RZR™ XP 900 2013-2014
Polaris® ​​Various 900's 2013-2016
​Polaris® RZR™ XP 1000 2014
​Polaris® RZR™ XP1000 / RZR™ XP Turbo / RZR™ RS1 2015-'21​

Lightweight Racing Valve Spring Kit and Components forHonda® and Kawasaki® Various 250's 2018-2021


Since 1939, KPMI® has taken great pride in our ability to design innovative performance improvements for valvetrains. This innovative ability has never been more apparent than with the development of the high tech lightweight racing valve spring kits for the incredibly stressed and torturous environment in today’s high revving 4-stroke engines. The challenge to engineer a valvetrain that would outperform OEM systems, that in some cases included titanium components, was not an easy one. This task would require the concentrated efforts of every member of KPMI®’s design team. It was apparent early on that an OEM style spring with a bit more pressure was not going to be the complete answer for these engines. Working together as a team enabled KPMI® to evolve with a “unified system” approach. In fact, these innovative high performance lightweight valve spring kits, would not only outperform factory parts, but outlive them as well. Each KPMI® spring kit is designed for its specific application, taking into account several critical parameters including; cam profiles, harmonics, natural frequency of the springs, valvetrain mass, required pressure, wire stress, fatigue life, and engine rpm, just to name a few! Today KPMI® proudly offers complete high performance lightweight valve spring kits for a host of applications.

We choose to use the copper based C63000 nickel-aluminum bronze as a material to make our bronze valve guides because of its ideal characteristics for the application. The 5% 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, which promotes high performance and endurance.


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 lightweight, strong, one piece forgings with profiles that provide excellent flow characteristics.


To learn more about these Kibblewhite®  Lightweight Racing Spring Kit and other valvetrain related components,  go to 

Honda® CRF™ 250R / RX 2018-2021

​Kawasaki® KX250F™  2020-2021​

KPMI® High Chrome Seats for HD® Milwaukee-Eight 2017-2021


•  18-22% Chromium for resistance to abrasion, corrosion, and deformation
•  1-2% Nickel content, which lends to corrosion-resistance and toughness
•  Machined from solid bar stock and ground to exacting tolerances
•  The alternative to Powder Metal
•  Machines as a continuous chip
•  Use KPMI® “High Chromium Seats” for your next gasoline or diesel engine rebuild



To learn more about these Kibblewhite®  High Chrome Seats and  other valvetrain related components, go to 
Harley-Davidson® Milwaukee-Eight 2017-2021

​​​KPMI® H.T. Steel Std. OEM Dia. Cylinder Stud Kit for Honda® Various 450's 2002-2017


• Nuts are machined from billet high tensile steel and heat treated
• Studs are heat treated 180,000 PSI aircraft alloy steel
• Both nut and stud have rolled threads for the strongest possible threads
• Both nut and stud are black oxide treated for enhanced corrosion resistance

• No Cylinder Head modification is required



To learn more about these Kibblewhite®  H.T. Steel Cylinder Stud Kit and  other valvetrain related components for the various models,  go to  
Honda® CRF450R 2002-2008​

Honda® CRF450X 2005-2017

Honda® TRX450R/ ER 2006-2014

KPMI® Tensilite® Titanium Blank Valves for HD® Milwaukee-Eight 2017-2021


Kibblewhite® Tensilite® titanium valves are manufactured from solid U.S. milled titanium bar. The titanium bar is cut, and forged, and then the stem is pulled from the forging process and cross-sectionally reduced.
These one piece forgings made from 6AL4V or 6-2-4-2 titanium alloy reflect the latest developments in titanium valve alloys. These alloys have superior hardness, strength, and thermal characteristics. After final grinding and machining, Tensilite® valves are encased in a hard Chromium Nitride (CRN) shell. CRN offers excellent resistance to impact, abrasion and corrosion. These qualities and its low coefficient of friction make CRN the coating of choice for high performance titanium valves.



To learn more about these Kibblewhite®  Tensilite Titanium Blank Valves and  other valvetrain related components, go to 
Harley-Davidson® Milwaukee-Eight 2017-2021

Beehive Racing Valve Spring Kit and Components for Honda® Various 1000's Applications


By taking advantage of the latest development in valve spring wire chemistry and manufacturing techniques, KPMI® has developed ovate wire Beehive style springs that will live and Perform at a high level in Honda® applications. By coupling these developments with strict KPMI® design protocols and employing multiple design, simulation, and FEA analysis software, we were we able to overcome the torsional stresses unique to ovate wire springs that previously severely limited their operating parameters. KPMI® Beehive Springs are progressively wound using Kobe Super-Clean chrome silicon based wire that is heat treated and shot peened. KPMI® uses its tightly toleranced, FEA designed hardened Titanium and H.T. Steel retainers in these applications to ensure correct assembly height and resist keeper pull through. The hardened steel basewashers included in these kits are designed to locate the spring and control lateral movement.

We choose to use the copper based C63000 nickel-aluminum bronze as a material to make our bronze valve guides because of its ideal characteristics for the application. The 5% 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, which promotes high performance and endurance.


We fully CNC machine our White Diamond® Valves from a one-piece forging of either EV8 Stainless Steel or Inconel-751. These materials have proven heat and corrosion resistance properties. Each valve is designed using Finite Element Analysis software, and profiles are tested on our computerized flow bench. Strict attention is paid to the surface preparation of the valves, and the purity of the chrome is closely monitored. A 360 degree anode is used to produce the highest possible grade of hard chrome finish. White Diamond® Valves are light, strong, one piece forgings with profiles that provide excellent flow characteristics


To learn more about these Kibblewhite®  Lightweight Racing Beehive Spring Kit and other valvetrain related components for the various models,  go to 

​Honda® CRF™ 1000A/D 2017-2019

​Honda® ​Talon™ 1000X/R 2019-2021

​Honda® ​Pioneer™ 1000 2016-2021

KPMI® H.T. Steel Cylinder Kit for Yamaha® Various 450's 2006-2020


•  Each kit include studs, nuts and washers to replace the OEM bolt
•  Nuts are machined from billet high tensile steel and heat treated
•  Studs are heat treated 180,000 PSI aircraft alloy steel
•  Both nut and stud have rolled threads for the strongest possible threads
•  All studs, nuts and washers are black oxide treated for enhanced corrosion resistance



To learn more about these Kibblewhite®  H.T. Steel Cylinder Stud Kit and  other valvetrain related components for the various models,  go to 
Yamaha® Various 450's 2003-2020 (Dirt)

Yamaha® Various 450's 2003-2020 (ATV/UTV)

3nd Round Top End Service Kits - Stainless Conversion for Suzuki® LTR™ 450 and  Yamaha®  YFZ™ 450 / 450R Applications


ALL KIT CONTENTS
•  High Compression Racing Piston with Coated Skirt (with rings and pin)
•  Top End Gasket Kit (Head Gasket, Base Gasket, Exhaust Gasket, Cam Chain Tensioner  Gasket, Valve Stem Seals, Cylinder Head Drain Seal)
•  Std. Black Diamond™ or White Diamond® Stainless Valves
•  Lightweight Racing Spring Kit (Titanium Retainers, Dual Springs, H.T. Steel Basewashers)

FEATURES
•  Designed specifically for the performance demands of popular racing MX Bikes and Quads.
•  Pistons designed to maintain the stock compression after the effects of the dished stainless valves
•  2618 Alloy Fully CNC Machined Piston with performance skirt coating
•  Black Diamond™ and White Diamond® Stainless Steel Conversion system significantly increases valve durability
•  Lightweight Racing Spring Kit Compatible with high performance cams
•  All of the gaskets, rings, pins and seals required for a top end rebuild
 
IMPORTANT NOTE: The piston, rings, valves and pin clips in this kit are designed to work together as a system. They are NOT COMPATIBLE with O.E.M. components and should ONLY be used with the components in this KPMI® Top End Service Kit.

​​

To learn more about other Kibblewhite® Various Suzuki® and Yamaha® parts and accessories, go to 
Suzuki®  LTR 450R 2006-2009
Yamaha Various 450cc 2003-2020 

​​​​KPMI® H.T. Steel Cylinder Stud Kit for Suzuki® LTR 450 / 450Z 2006-2009


• Nuts are machined from billet high tensile steel and heat treated
• Studs are heat treated 180,000 PSI aircraft alloy steel
• Both nut and stud have rolled threads for the strongest possible threads
• Both nut and stud are black oxide treated for enhanced corrosion resistance



To learn more about these Kibblewhite®  H.T. Steel Cylinder Stud Kit and  other valvetrain related components, go to 
Suzuki® LTR 450 / 450Z 2006-2009