Kibblewhite Precision Machining (KPMI) high-performance lightweight racing valve spring kits are engineered to withstand the punishing environments and high-RPM demands of race-modified power plants. Designed using a strict "unified system" approach, these premium components out-perform and outlast factory OEM valvetrains, making them an essential upgrade for high-stress applications running aggressive aftermarket camshafts.

Key Features & Engineering:

• Advanced Metallurgy: Springs are progressively wound from high-strength Chrome Silicon (CrSi) or ovate wire, heat-treated, and shot-peened to deliver incredible resistance to fatigue and valve float.

• Mass-Optimized Retainers: Equipped with lightweight, FEA-designed (Finite Element Analysis) titanium or hardened heat-treated (H.T.) steel retainers that minimize top-end valvetrain weight without sacrificing structural integrity.

• Application-Specific Harmonics: Every kit is precisely engineered for its specific engine platform, balancing critical parameters like cam profiles, harmonic frequencies, mass, wire stress, and exact seat/open pressures.

• Complete Drop-In Security: Each kit provides a matched set of high-strength base washers, springs, and premium retainers—offering total valvetrain control, added clearance, and exceptional longevity under maximum lift conditions.

The Verdict: Whether you are building a high-revving motocross engine, upgrading an aggressive trail quad, or pushing extreme boost pressures, KPMI racing springs deliver the precise valvetrain control needed to protect your engine from catastrophic damage at peak RPM.

 WORKS BEST with STAGE 1 or 2 CAMSHAFT

KIBBLEWHITE SPRING KIT 80-8000Racing Spring Kit (Titanium, 0.475" Lift)

KIBBLEWHITE BLACK DIAMOND EXHAUST VALVE (34mm head diameter)

KIBBLE WHITE BLACK DIAMOND INTAKE VALVE (40mm head diameter)

Made in the USA