High Performance " Turbo" and Lightweight Racing Spring Kits with New H.T. Steel Retainers for Polaris® RZR 900/ 1000 Applications
KPMI® performance valve spring kits are modeled using cam profile and simulation software. By utilizing Finite Element Analysis (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. With two different spring pressure option kits to choose from, these are the ultimate setup for any Polaris RZR/ Ranger tuner.
Kit Includes:
• Springs, H.T. Steel Retainers, H.T. Steel Basewashers, and Red Viton® Seals
To learn more about this Kibblewhite® New H.T. Steel Retainers for the various models, go to
Ovate Wire Beehive Valve Spring Kits and Components for Harley-Davidson® Milwaukee-Eight 2017-2018
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. 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.
These Black Diamond™ valves for the Milwaukee-Eight were designed by KPMI® to achieve excellent flow characteristics. They are lightweight, one piece forged and made from high strength. They are available with standard head diameters or call for customs sizes.
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.
To learn more about this Kibblewhite® beehive valve spring kits and other valvetrain related components for the Harley-Davidson® Milwaukee-Eight, go to Harley-Davidson ® Milwaukee-Eight Components Section.
Piston System Includes Valvetrain for Yamaha® YZ250F 2014-2016
• In order to maximize compression, the valve reliefs in the piston are purposely convex and match the geometry of the dishes in the valves
• The conversion to Black Diamond™ Stainless Steel Valves offers up to double the life over stock Titanium valves without a loss in performance.
Kit Includes:
• Piston, Rings, Clips and Pin
• Top End Gasket Kit by Cometic
• KPMI® S.S. Black Diamond™ Valves, Stock Head Dia.
• Dual Spring Titanium Retainer Spring Kit, Which Allows for 0.395” In. and 0.370” Ex. Valve Lift
To learn more about other Kibblewhite® Yamaha® parts, go to our www.kpmi.us Yamaha® YZ250F 2014-2017 Section
Nuts (Cylinder Stud), H.T. Steel , Honda®, CB™ 750 SOHC (Excluding F2™), 1969-1978
These nuts are manufactured from a high strength premium steel that promotes excellent surface finish and tight tolerances, two critical factors for achieving correct fit and torque. After machining, the nuts are heat treated to a specific depth. This creates hard, wear resistant working surfaces, while retaining a ductile core to prevent cracking under load. The premium black oxide treatment gives an excellent, corrosion resistant appearance.
Note:
• Designed for Honda® CB750, but can be used for general purpose
To learn more about other Kibblewhite® Hondai® parts, go to our www.kpmi.us Honda® CB750 SOCH Section
Racing Spring Kit, 0.515" Lift, Yamaha®, SR™/TT™/XT™ 500, 1976-1981
• 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
• This kit supersedes KPMI® spring only kit 80-0514, which is no longer available
Kit Includes:
• Springs, H.T. Steel Retainers, Keepers, and Shims
To learn more about other Kibblewhite® Yamaha® parts, go to our www.kpmi.us Yamaha® SR/TT/XT Section
New Swing Arm Bushings for Various Honda® Applications
• Replaces worn or damaged plastic O.E.M. bushing
• High quality bearing bronze offers increased durability and better fitment compared to O.E.M.
• O.E.M. P/N: 52108-457-300 & 52108-422-300
To learn more about this Kibblewhite® New Swing Arm Bushings for the various models, go to
Lightweight Racing Spring Kit and Components for Honda® CRF™ 250R 2016-2017
Since 1938, KPMI® has taken great pride in our ability to design innovative Performance improvements, valvetrains. This innovative ability has never been more apparent than with the development of the high tech lightweight racing valve spring kits, 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, these engines. Working together as a team enabled KPMI® to evolve with a "unified system" approach. In fact, these innovative High-Performance Lightweight Spring Kit, would not only outPerform factory parts but outlive them as well. reach KPMI® spring kit is designed, its specific application, taking into account several critical parameters including; cam profiles, harmonics, a 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, a host of applications.
To learn more about this Kibblewhite® lightweight racing kit and other valvetrain related components, go to Honda® CRF 250R 2016-2017 Components Section
High Performance Lightweight Racing Spring Kit and Components for Yamaha® 1.8L 4V Watercraft 2008-2018
• Spring Kit is designed with increased spring rate and higher lift compatibility over the stock components
• Spring Kit is specifically designed for high boost / high RPM applications
• CNC'd Titanium Retainers and Cr-Si dual springs provide valvetrain control at high RPM with high performance camshaft compatibility
To learn more about this Kibblewhite® high performance lightweight racing kit and other valvetrain related components, go toYamaha® 1.8L 4V Watercraft 2008-2018 Components Section
New H.T. Steel Retainers for Various BSA® & Triumph® Applications
Brand new state of the art finite element analysis software has allowed the KPMI® engineering department to reduce the mass of our heat treated steel retainers. Lightening holes have been added to the steel retainers without sacrificing any strength or durability. All shoulders and cross sections were also analyzed for other opportunities to further reduce mass. These efforts led to mass reductions of up to 25% over the O.E.M. retainers.
Kit Includes:
• Springs, H.T. Steel Retainers, and Basewashers
To learn more about this Kibblewhite® New H.T. Steel Retainers for the various models, go to
Cylinder Stud Kit, HT Steel, Oversized 1/2", Suzuki®, GSX-1300R™ Hayabusa™, 1999-2017
• 1/2″ Oversized studs for maximum strength, intended for high HP and forced induction applications
• High quality CNC machined, heat treated steel nuts. Also, the studs have rolled for maximum tensile strength
• 12-Point Nut pattern allows maximum power transmission and clearance when installing
Kit Includes:
• 10 Studs, 10 Nuts, and 10 Washers
To learn more about other Kibblewhite® Suzuki® parts, go to our www.kpmi.us Suzuki® GSX-1300R Hayabusa Section