Features:
- Kit includes all necessary parts for a complete top-end service/rebuild: pistons, piston rings, piston pins, gaskets, valves, and valve springs
- Pistons fully machined from 2618 aluminum alloy with a performance skirt coating
- Lightweight racing valve spring kit with titanium valve spring retainers, dual springs and H.T. steel base washers (springs are suitable for use with high-performance cams)
- All necessary gaskets, seals and O-rings included
- The pistons, rings,valve and pin clips are designed to work togethere as a system.
- Not compatible with OEM components.
- Includes: • 3x Intake Titanium Retainers • 3x Intake CrSi Valve Springs • 3x Intake H.T. Steel Basewashers • 2x Exhaust Titanium Retainers • 2x Exhaust CrSi Valve Springs • 2x Exhaust H.T. Steel Basewashers • 2x Intake Standard Outer White Diamond® Valves • 1x Intake Standard Center White Diamond® Valve • 2x Exhaust Standard White Diamond® Valves • 3x Intake Viton® Seals • 2x Exhaust Viton® Seals • 1x High Performance Piston Kit • 1x Top-End Gasket Kit
Fit the models:
| YAMAHA |
WR 450 F |
2004 |
| YAMAHA |
WR 450 F |
2005 |
| YAMAHA |
WR 450 F |
2003 |
| YAMAHA |
WR 450 F |
2006 |
| YAMAHA |
YZ 450 F |
2003 |
| YAMAHA |
YZ 450 F |
2004 |
| YAMAHA |
YZ 450 F |
2005 |

Kibblewhite Precision Machining, Inc. (KPMI) is a U.S.-based manufacturer founded in 1939, specializing in high-performance valvetrain components for motorcycles and motorsports. Headquartered in Pacifica, California, KPMI is known for precision-engineered valves, springs, guides, and related parts, serving a global market including sportbikes, dirt bikes, and custom builds.
| Brand |
Model |
Year |
Name |
CC |
| YAMAHA |
WR |
2003 |
|
450 |
| YAMAHA |
WR |
2004 |
|
450 |
| YAMAHA |
WR |
2005 |
|
450 |
| YAMAHA |
WR |
2006 |
|
450 |
| YAMAHA |
YZ |
2003 |
|
450 |
| YAMAHA |
YZ |
2004 |
|
450 |
| YAMAHA |
YZ |
2005 |
|
450 |
| YAMAHA |
WR |
2003 |
|
450 |
| YAMAHA |
WR |
2004 |
|
450 |
| YAMAHA |
WR |
2005 |
|
450 |
| YAMAHA |
WR |
2006 |
|
450 |
| YAMAHA |
YZ |
2003 |
|
450 |
| YAMAHA |
YZ |
2004 |
|
450 |
| YAMAHA |
YZ |
2005 |
|
450 |