Kibblewhite Racing Valve Spring Kit w/ Steel Retainers for Yamaha YXZ [(2016-21) 80-81700]Regular price $ 319.00
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.
- Twelve steel retaining caps
- Twelve dual-rate valve springs
- Twelve hardened steel base washers
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.