KPMI Lightweight Racing Valve Spring Kit – CRF450R & CRF450RX 2017–2025
KPMI Lightweight Racing Valve Spring Kit – Honda CRF450R / CRF450RX (2017–2025)
Description
KPMI’s Lightweight Racing Valve Spring Kit is engineered for riders pushing the limits of performance. Built from premium Chrome-Silicon alloy, this system delivers precise valvetrain control at high RPMs while remaining compatible with boosted or turbocharged applications.
The titanium and H.T. steel retainers paired with dual Cr-Si springs ensure strength, reduced mass, and excellent harmonic balance. Designed to handle aggressive cam profiles with up to 0.440" intake lift and 0.405" exhaust lift, this spring kit provides the stability and reliability demanded by race-level builds.
What’s Included
✅ 2 × Intake CrSi Valve Springs
✅ 2 × Exhaust CrSi Valve Springs
✅ 2 × Intake Titanium Retainers
✅ 2 × Exhaust Titanium Retainers
✅ 2 × Intake H.T. Steel Basewashers
✅ 2 × Exhaust H.T. Steel Basewashers
Note:
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Exhaust springs include a progressively wound inner spring; install the tightly wound end toward the H.T. steel basewasher.
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Keepers not included.
Fitment
📦 Honda CRF450R / CRF450RX
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2025 CRF450R
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2025 CRF450RX
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2024 CRF450R
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2024 CRF450RX
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2022 CRF450R
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2022 CRF450RX
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2021 CRF450R
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2021 CRF450R W.E.
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2021 CRF450RX
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2020 CRF450R
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2020 CRF450R W.E.
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2020 CRF450RX
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2019 CRF450R
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2019 CRF450R W.E.
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2019 CRF450RX
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2018 CRF450R
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2018 CRF450RX
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2017 CRF450R
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2017 CRF450RX
Warranty Info
🛡️ Covered by KPMI’s limited warranty against defects in materials and workmanship.
Key Features
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Lightweight racing design for high-RPM and boosted applications
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Dual Chrome-Silicon springs with titanium and H.T. steel retainers
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Compatible with high-lift camshafts (0.440" intake / 0.405" exhaust)
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Seat Pressure: 50 lb intake / 90 lb exhaust
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Open Pressure: 162 lb intake / 220 lb exhaust
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Designed and manufactured in the USA
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Optimized for stability, reduced mass, and long service life
Price & SKU
💲 Retail Price: $207.83
SKU: 0926-3087
Brand Number: 30-32800
Estimated Shipping Weight: 0.56 lb
📦 Shipping Information
In-Stock Items:
- Most parts ship next business day
- Modquad parts: Monday–Thursday dispatch
Made-to-Order Items:
- Custom swingarms & A-arms: 2–4 weeks
- EVP exhaust systems: 2–4 weeks
- Sneakers: 1–2 weeks
Stock Guarantee: Items marked "In Stock" ship immediately. Made-to-order items are built fresh for you.
Questions? Contact us—we respond within 24 hours.
