Kibblewhite Racing Valve Spring Kit w/ Steel Retainers for Yamaha YXZ [(2016-21) 80-81700]

The Yamaha YXZ 1000R is one of the few unique UTV's that like to rev high RPM's. This valve spring kit has been revved up to 11500 rpm coupled with a raised rev limit—a significant upgrade for turbo applications and higher-revving tunes. 

Includes:

• Twelve steel retaining caps
• Twelve dual-rate valve springs
• Twelve hardened steel base washers

Type- Intake/Exhaust

Retainer Material- Titanium

Valve Lift- 0.445"

Installed Height- 1.300"

Seat Pressure- 53#

Open Pressure- 162#

@ Lift- 0.445"

Note- To achieve higher than stock lift, it may be necessary to use KPMI Shortened Valve Guides #80-80470.

Since 1938, KPMI® has taken immense 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 of engineering a valvetrain that would outperform OEM systems, which 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. Early on, it was apparent that an OEM-style spring with a bit more pressure would not be the complete answer for these engines. Working together enabled KPMI® to evolve with a "unified system" approach. These innovative, high-performance, lightweight valve spring kits would outperform factory parts and outlive them.

Each KPMI® spring kit is designed for its specific application, considering several critical parameters: cam profiles, harmonics, the natural frequency of the springs, valvetrain mass, required pressure, wire stress, fatigue life, and engine rpm, to name a few!

Today KPMI® proudly offers complete high-performance, lightweight valve spring kits for a host of applications.