Engines and Components› Camshafts and Valvetrain

Kibblewhite Precision Machining

Kibblewhite Valve Spring Kit

$342.95

SKU: 80-80394

In Stock
In Stock
Ships by Sep 12
Free Shipping over $200
$100 Minimum Order
30 Days Return
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Overview

The Kibblewhite Precision Machining 80-80394 is a spring-only valve spring kit designed for high performance applications. It features intake valve lift of 0.350" and exhaust valve lift of 0.315". The springs are made from Super-Clean Chrome-Silicon wire, traceable to Japanese manufacturing, and undergo rigorous heat treatment, stress relief, and shot peening processes.
Show original supplier description
The Kibblewhite Precision Machining 80-80394 is a high-performance spring-only valve spring kit engineered for various Yamaha applications. Designed in-house using proprietary software, these springs are meticulously analyzed for stress, natural frequency, system harmonics, and fatigue life. The Super-Clean Chrome-Silicon wire used is sourced from Japan, known for its quality, and each spring undergoes a controlled heat treatment, stress relief, and shot peening process to ensure durability and optimal performance. This kit provides specific lift specifications for both intake and exhaust valves. The intake side offers a valve lift of 0.350" with an installed height of 1.370", featuring 30 lbs of seat pressure and opening to 90 lbs at full lift. The exhaust side provides a valve lift of 0.315" with an installed height of 1.415", offering 44 lbs of seat pressure and opening to 95 lbs at full lift. This high-performance valve spring kit is compatible with several Yamaha models, including the YZF-R1 from 1998-2003, the Apex from 2006-2010, and the RX-1 from 2003-2005. All KPMI valve springs are manufactured by ISO-certified U.S. based partners, ensuring a high standard of quality. Combining advanced design, simulation, and manufacturing protocols, Kibblewhite Precision Machining aims to deliver the best possible valve springs for performance enthusiasts.

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

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Specifications

BrandKibblewhite Precision Machining
Part Number80-80394
CategoryEngines and Components

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Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

Free shipping over $200 in the continental US. Alaska, Hawaii, U.S. territories (Puerto Rico, U.S. Virgin Islands, Guam, American Samoa, and the Northern Mariana Islands), and international orders carry surcharges — most appear at checkout. Some exceptions (LTL freight, or suppliers who quote freight only after we place the order) won’t. In those cases we’ll reach out with the exact charge before your order moves forward.

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