Intake Only Kits for Honda® Various TRX™ 450's
• Spring Kit is designed with increased spring rate and higher lift compatibility over the stock components
• CNC turned retainers and Cr-Si dual springs provide valvetrain control at high RPM with high performance camshaft compatibility
• Black Diamond™ Stainless Steel Conversion system significantly increases valve durability
Since 1939 KPMI® has taken great pride in our ability to design innovative Performance improvements , valvetrain. This innovative ability has never been more apparent than with the development of the high tech lightweight stainless steel conversion systems , the incredibly stressed and torturous environment in today's ultra high revving 4-stroke singles.
The challenge to engineer valvetrain that would out Perform 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 a lightweight high flowing KPMI® stainless race valve was not going to be the complete answer , these engines. Working together as a team enabled KPMI® to evolve with a "unified system" approach. In fact, this innovative lightweight system would not only out Perform factory parts, but outlive them as well.
Today KPMI® proudly offers many complete valvetrain systems , a host of applications. Also, , applications with low hours and/or apparent In face recession and Ex components that meet factory specifications consider KPMI®'s Intake Only Systems when Performing necessary service. Bear in mind that KPMI® does not advise partial conversions on race bikes and/or engines that have reached factory advertised service limits. Always consult with qualified professionals suited to inspect your machine.
To learn more about these Kibblewhite® Intake Only Kits and other valvetrain related components, go to
Lightweight Racing Dual Spring Kits for Various Harley-Davidson® Applications
• AV&V Style Dual Spring kits for 0.650” and 0.675” lift
• Exact match for Installation Heights and Spring Pressures
• Retainers designed for optimum rocker cover clearance
• Includes Heavy Duty 9° H.T. Steel Keepers
• Offer in Titanium and H.T. Steel retainers
Since 1938, 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 V-Twin engines.
The challenge to engineer a valvetrain that would outperform OEM systems 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.
To learn more about these Kibblewhite® Dual Spring Kits and other valvetrain related components, go to
Harley-Davidson® Evolution™ 1984-1999
Harley-Davidson® Evo Sportster™ 883cc 1986-’03
Harley-Davidson® XL™ 1100cc 1986-1987
Harley-Davidson® Evo Sportster™ 1200cc 1988-’03
Harley-Davidson® Twin Cam™ 88” 1999-2004
Lightweight Racing Spring Kit and Components for Suzuki® King Quad's 700-750 2005-2020
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 Kits and other valvetrain related components, go to
Suzuki ® King Quad's 700-750 2005-2020
1st Round of Cylinder Head Service Kits for Various Applications
KPMI® is proud to introduce full CYLINDER HEAD SERVICE KITS. These kits contain all items to completely refresh and upgrade cylinder heads for popular Dirt / MX and Side x Side models with KPMI’s top quality racing valvetrain components.
• Save time money on your next cylinder head rebuild
• One package, everything you need for factory recommended valvetrain service
• Double your service life over OEM using KPMI® Valvetrain products
• Kitted with value added savings
Kit Includes:
◊ Retainers
◊ Springs
◊ Basewashers as required
◊ Seals
◊ Guides
◊ Complete Set of Stainless Steel Valve (Std. Head Size)
◊ Complete Cometic™ Top End Gasket Kit
To learn more about these Kibblewhite® Cylinder Head Service Kits, or other valvetrain related components for the various models, go to
Can-Am® Various 580-1000cc Twins 2013-2018
Honda® CRF 250R 2004-2007/ CRF 250X 2004-2015
Honda® CRF™ 450R / RX / WE 2017-2021
Honda® TRX™ 450R / ER 2006-2014
Polaris® RZR™ XP Turbo 2016-2020
Polaris® RZR™ XP1000 / RZR™ S1 2015-2020
Yamaha® YZ™ 450F 2003-'05 / WR™450 2003-'06
Yamaha® YZ™ 450F 2006-'09 / WR™450 2007-'15
Yamaha® YZ™ 450F 2014-'19 / 450FX 2016-'19
Yamaha®, Various 700's, 2006-2021
Figure 2
Steel Retainer Lightweight Racing Beehive Spring Kit and Components for Harley-Davidson® Milwaukee-Eight™ 2017-2021
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 Harley Davidson 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. This was critical, as there are nearly 100 camshaft part numbers available , these applications. KPMI® Beehive Springs are progressively wound using Kobe Super-Clean chrome silicon based wire that is heat treated and shot peened. The hardened steel basewashers included in these kits are designed to locate the spring and control lateral movement. KPMI® made OEM replacement seals are included for a more complete performance valvetrain solution.
To learn more about these Kibblewhite® Lightweight Beehive Spring Kits and other valvetrain related components, go to
Harley-Davidson® Milwaukee-Eight 2017-2021
Beehive Spring Kit, 0.625" Lift for Harley-Davidson® Milwaukee-Eight™ 2017-2021
• 0.625” Valve Lift capable, ovate Wire beehive springs designed specifically for maximum performance Harley Davidson®
Milwaukee Eight engines
• Lightweight Titanium or Heat Treated Steel Retainers and Beehive Springs reduce reciprocating mass while providing
the spring forces required for high-lift camshaft and sustained high rpm’s
• KPMI® made OEM replacement seals, #71046-8 are included for a more complete performance valvetrain solution
To learn more about these Kibblewhite® Beehive Spring Kits and other valvetrain related components, go to
Harley-Davidson® Milwaukee-Eight 2017-2021
Tech Bulletin- Superseded Kawasaki® and Suzuki® Valves
KPMI® has several Kawasaki® and Suzuki® valve designs whereas we have selected a proprietary material and heat treatment process that enhances the durability of the valve face to retard valve face recession. For several years now, this material and heat treatment process was coupled with the KPMI® Black Diamond™ surface treatment. During the heat treatment stage of manufacturing, the Black Diamond™ coating would come under attack and suffer oxidation and corrosion, leaving a new valve looking used. Although this combination of processes did achieve a superior stainless one piece valve that would prove to have a highly durable valve face, the valve heads had an unaesthetic appearance (see Figure 1 and 2). Recently, the KPMI® engineering department completed design reviews for all valves with these issues. The solution was to move away from the KPMI® Black Diamond™ treatment and introduce the well-recognized and proven KPMI® White Diamond® coating and then post process after heat treatment to leave the head of the valve in a beautiful polished stainless finish (see Figure 1 and 2). We hope you are as excited as we are to provide you with these enhanced valve designs that we will be introducing in a superseding fashion over the next few months.
Please refer to 3rd round of the updated superseded part numbers, go to
Figure 1
Performance Rebuild Beehive Spring Only Kit and Components for Suzuki® GSX-R1000 2009-2016
These high quality replacement springs have been designed to exceeds the OEM specifications by fitting precisely on the spring shoulder diameter of both the OEM retainers, and KPMI® H.T. Steel retainers (P/N 60-61701).
This kit also includes H.T. Steel basewashers in order to achieve a precision fitment on the large end of our beehive spring which, better controls the lateral motion of the spring, ensuring longer life and less wear on the valvetrain components.
KPMI® has gone a step further and specified the latest in spring materials and processing, an extremely robust design that will last longer than anything currently on the market
Unique features of this spring include is beehive variable rate wind to reduce the chances of spring surge due to cam harmonics, Super-Clean Chrome Silicon wire with additional Vanadium and Nickel added, increased strenth, and a gas nitrided and double shot peened finish, greater fatigue life Each basewasher has been engineered to maximize its mechanical strength using FEA design software.
By utilizing FEA software, it was possible to take advantage of the increased strength and wear resistance of a heat treated steel retainer, while reducing its mass to within grams of a comparable titanium retainer. These retainers are intended as an OEM replacement and are completely compatible with the OEM springs, keepers, and shims. The spring shoulder diameter has been designed to match the OEM retainer and spring as well as KPMI's beehive spring (P/N 60-61700), making this retainer your high performance OEM alternative.
Since 1938, 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® Spring Kits and other valvetrain related components, go to
Suzuki ® GSX-R 1000 20009-2016
H.T. Steel Rocker Arm Tower Stud Kit for Harley-Davidson® Milwaukee-Eight™ 2017-2021
• 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
• This kit is the M8 rocker tower solution
To learn more about these Kibblewhite® Rocker Arm Tower Stud Kit and other valvetrain related components, go to
Harley-Davidson® Milwaukee-Eight 2017-2021
Cylinder Studs for Harley-Davidson® Milwaukee-Eight 2017-2021
• Heat treated 180,000 PSI aircraft alloy steel
• Centerless ground to remove material imperfections
• Rolled threads for the strongest threads period
• Black oxide treated for enhanced corrosion resistance
• The M8 Cylinder Stud solution
KPMI® Cylinder Studs are made from 180,000 psi yield strength, fine grain, heat treated, aircraft grade alloy steel. When you want a stud that meets proof-stress and maximizes clamping force, look no further. KPMI® “rolls” the threads, heat treats and then centerless grinds the entire body of the stud. Rolling the threads creates the toughest and strongest thread possible and centerless grinding removes notch sensitivity. Further, the case end thread is designed to have a slight interference fit to minimize distortion and maintain good thread contact during torque procedure. The final process for all KPMI® Studs is to encase the entire stud with premium corrosion resistant treatment of Black Oxide. Congratulations on your choice to purchase a stud that meets and exceeds your stock-replacement of high-performance needs!
To learn more about this cylinder studs and other valvetrain related components, go to
Harley-Davidson® Milwaukee-Eight 2017-2021
Shim On Bottom (SOB)
Engine and Valve Kits for Various Harley-Davidson® Applications
• Save time money when purchasing this kit
• One package, everything you need for a cylinder head overhaul
• Double your service life over OEM using KPMI® Valvetrain products
• All the components in this kit would cost more if bought individually
Engine Kit Includes:
• KPMI® complete Valve Spring Kit that meets or exceeds OEM specifications
• Seals (where applicable)
• Keeper (where applicable)
• KPMI® S.S. Black Diamond™ Valves, Stock Head Dia.
Valve Kit Includes:
• A Full Set of S.S. Black Diamond™ Valves, Stock Head Dia.
To learn more about these Kibblewhite® Engine and Valve Kits, or other valvetrain related components for the various models, go to
Harley-Davidson® Knucklehead™ 1936-1947
Harley-Davidson® Panhead™ 1948-1965
Harley-Davidson® Sportster™ 1957-1969
Harley-Davidson® Sportster™ 1970-1983
Harley-Davidson® Shovelhead 74" 1966-1977
Harley-Davidson® Shovelhead 80" 1978-1983
Harley-Davidson® Evolution™ 1984-1999
Harley-Davidson® Sportster 883cc 1986-2003
Harley-Davidson® Sportster 1200cc 1988-2003
Harley-Davidson® Sportster 1200cc 2004-2021
Harley-Davidson® Twin Cam 88" 1999-2004
Harley-Davidson® Twin Cam 88"-103" 2005-2017
Figure 2
Lightweight Racing Spring Kit and Components for Yamaha® YZ™ 250F 2019-'21 / WR™250F & YZ™ 250FX 2020-'21
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 Kits and other valvetrain related components, go to
Yamaha® YZ™ 250F 2019-'21 / WR™250F & YZ™ 250FX 2020-'21
KPMI® Tech Bulletin- Superseded Suzuki® GSX-1300R Hayabusa Valves
The KPMI® valve designs for the Suzuki® Hayabusa™ utilize a proprietary material and heat treatment process that enhances the durability of the valve face to retard valve face recession. For several years now, this material and heat treatment process was coupled with the KPMI® Black Diamond™ surface treatment. During the heat treatment stage of manufacturing, the Black Diamond™ coating would come under attack and suffer oxidation and corrosion, leaving a new valve looking used. Although this combination of processes did achieve a superior stainless one piece valve that would prove to have a highly durable valve face, the valve heads had an unaesthetic appearance (see Figure 1 and 2). Recently, the KPMI® engineering department completed design reviews for all valves with these issues. The solution was to move away from the KPMI® Black Diamond™ treatment and introduce the well-recognized and proven KPMI® White Diamond® coating and then post process after heat treatment to leave the head of the valve in a beautiful polished stainless finish (see Figure 1 and 2). We hope you are as excited as we are to provide you with these enhanced valve designs that we will be introducing in a superseding fashion over the next few months.
To learn more about these Kibblewhite® Superseded Valves and other valvetrain related components, go to
High Performance Spring Only Kit and Black Diamond™ Valves for Honda® CB™ 750 SOHC F2/3 1977-1978
• High performance spring only solution compatible with the OEM retainer and base
• Increased spring force and rates compared to the OEM springs designed for hi-lift cams and high RPM conditions
• Premium grade, super clean ground chrome silicon wire X-Rayed at regular intervals to check for inclusions, heat
treated, and shot peened, insuring maximum spring life.
• Material and workmanship for desired advantages
• One piece forged EV8-SS offers uninterrupted grain flow for head stability
• Tufftride® coated for a high durability, low friction impregnated surface finish
• “Super-Finished” stem allows for Formula 1 level coating consistency
• Highly controlled production tolerances for outstanding consistency
• Every surface is either CNC machined or ground as top quality valves should be
• Swirl polished or CNC machined profiles are Flow Bench tested for optimized air flow
• Street, Strip or Track. You are choosing extreme durability and performance
To learn more about these Kibblewhite® Spring Only Kits and Valves, go to Honda® CB750 SOHC F2/3 1977-1978
2nd Round of Cylinder Head Service Kits for Various Applications
KPMI® is proud to introduce full CYLINDER HEAD SERVICE KITS. These kits contain all items to completely refresh and upgrade cylinder heads for popular Dirt / MX and Side x Side models with KPMI’s top quality racing valvetrain components.
• Save time money on your next cylinder head rebuild
• One package, everything you need for factory recommended valvetrain service
• Double your service life over OEM using KPMI® Valvetrain products
• Kitted with value added savings
Kit Includes:
◊ Retainers
◊ Springs
◊ Basewashers as required
◊ Seals
◊ Guides
◊ Complete Set of Stainless Steel Valve (Std. Head Size)
◊ Complete Cometic™ Top End Gasket Kit
To learn more about these Kibblewhite® Cylinder Head Service Kits, or other valvetrain related components for the various models, go to
Honda® CRF™ 150R, 2007-2021
Honda® TRX™ 450R/ ER 2006-2014
KTM® 400-560 RFS Eng. 2000-2009 89mm Bore
KTM® 400-560 RFS Eng. 2000-2009 95mm Bore
Polaris® Predator / Outlaw™ 500 2003-2007
Polaris® RZR™ XP 900 2011-2012
Suzukii® LT-Z / D-RZ™ 400 2000-2017
Yamaha®, Various 600's 2001-2008
Yamaha® WR/YZ™ 250F 2014-2018/ WR™ 250F & YZ™ FX 2014-2019
Figure 1
Beehive Spring Kit, Solid Tappet Conversion, 0.385" Lift for Can Am® Maverick™/ X3 (900cc Triple Engines) 2017-'20 / Rotax® ACE 900cc Triple Engines 2014-'19
• The KPMI® Solid Tappet Conversion Valve Spring kit for the Maverick X3 replaces the OEM hydraulic tappet tappet unit
with a lightweight precision manufactured solid unit.
• By removing the OEM hydraulic unit, considerable weight savings are made. This allows the KPMI® valve spring kit to
control the valvetrain at higher boost pressures, higher RPM’s and with larger camshafts.
• The KPMI® solid tappet is CNC machined from high tensile strength bar stock, heat treated, ground and lapped for a
precision unit.
• The lightweight titanium retainer included is designed to house a standard Ø7.5mm lash adjustment shim.
To learn more about these Kibblewhite® Beehive Spring Kit, Solid Tappet conversion and other valvetrain related components, go to
Lightweight Racing Spring Kit and Components for Honda® CB350F / 400F 1972-1977
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 Kits and other valvetrain related components, go to
Honda ® CB350F / 400F 1972-1977