Racing Spring Kit, Titanium, 0.415″ Lift, Kawasaki®, KX™ 250F, 2017-2019 40-41400


Available on back-order



Available on back-order

Frequently Bought Together

Valve (OEM Replacement), Tensilite® Titanium, Std. IN, Kawasaki®, KX™ 250F, 2017-2019 # 40-41412T (each)

Kawasaki® KX™ 250F, 2017-2019





Valve (OEM Replacement), Tensilite® Titanium, Std. IN, Kawasaki®, KX250F (&F/ X/ XC)™, 2020-2023 # 40-41612T (each)

Kawasaki® KX™ 250F, 2020-2023





SKU: 40-41400 Categories: , , Tags: , ,


Lightweight High-Lift Racing Valve Spring Kit

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.

Installation Instructions Click Here
Type Intake / Exhaust
Retainer Material Titanium
Intake Valve Lift 0.415″
Intake Installed Height 1.315″
Intake Seat Pressure 65#
Intake Open Pressure 181#
Intake @ Lift 0.415″
Exhaust Valve Lift 0.415″
Exhaust Installed Height 1.310″
Exhaust Seat Pressure 49#
Exhaust Open Pressure 155#
Exhaust @ Lift 0.415″

Additional information

Weight .4 kg
Dimensions 18 × 12 × 5 cm


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