Kibblewhite yamaha yz250f

Kibblewhite Yamaha YZ250F

Valvetrain Components for Honda CRF450R Motocross.

Black Diamond Stainless Steel Valves

All KPMI™ Black Diamond™ stainless steel valves are impregnated by a special German process to a depth of .002”, with a surface build up of .0002”. This “Black Diamond™” process improves wear properties, reduces friction, and provides resistance to corrosion and wear that is superior to chrome and nickel electrolysis plating. Each valve is designed using Finite Element Analysis software, and profiles are tested on our computerized flow bench. Black Diamond™ Valves are lightweight, strong, one piece forgings with profiles that provide excellent flow characteristics.

Lightweight Racing Valve Spring Kits

KPMI® takes a scientific “System” approach when designing our Valve spring kits. Each component is designed to work with the others as part of the complete system. KPMI® engineers use our proprietary design and simulation softwares, and draw on our 70+ years of design experience to create these systems. Our design, simulation, and manufacturing processes insure compatibility of the valve spring’s force and natural frequency with the cam profile, valvetrain mass, system harmonics, and the engine RPM. Our spring manufacturing partners are U.S based companies that are ISO certified. The Super-Clean Chrome Silicon valve spring wire we use is traceable back to Kobe Japan where some of the best spring wire in the world is manufactured. Combining our design and simulation protocols with this premium quality valve spring wire, and manufacturing processes including, heat treatment, stress relief, and shot peening, allow us to supply you with the best valve springs in the world.

Valve Guides

We choose to use the copper based C63000 nickel-aluminum bronze as a material to make our bronze valve guides because of its ideal characteristics for the application. The 5% nickel content provides superior resistance to wear, and the approximately 80 percent copper content delivers outstanding heat conductivity. KPMI® guide profiles are designed to have minimal effect on the airstream while maintaining critical cross sectional thickness in high temperature areas, which promotes high performance and endurance.

Valve Stem Seals

KPMI® solid Viton® valve stem seals are designed to have optimum fitment, allow for maximum lift, and to give maximum life. KPMI® Red valve stem seals are resistant to high temperatures, petroleum products and the corrosive gasses that are the by-products of combustion. These seals retain their ability to seal in situations where other materials could harden and allow oil to enter the combustion chamber causing detonation, carbon build up and a loss of power. The Red Ones are truly the racer’s choice.

Application Listing

Click on application in the list to view more details on the part. All Prices are in Canadien Dollars

Part No. Supplier No. Description
VALVES
80-80073 Black Diamond Valve - Yamaha YZ250F 2001-2013 - Intake STD 23.00mm/0.906" $57.95(7) Check Stock
SND-020106-IV Black Diamond Valve - Yamaha YZ250F 2001-2013 - Intake OS 24mm, +1mm (Splash'n Dirt Exclusive) $144.00(7) Check Stock
80-80075 Black Diamond Valve - Yamaha YZ250F 2001-2013 - Intake STD (Center) 23.00mm/0.906" $57.95(7) Check Stock
80-80077 Black Diamond Valve - Yamaha YZ250F 2001-2013 - Exhaust STD 24.50mm/0.965" $57.95(7) Check Stock
SND-020106-EV Black Diamond Valve - Yamaha YZ250F 2001-2013 - Exhaust OS 25.50mm (Splash'n Dirt Exclusive) $144.00(7) Check Stock
TITANIUM VALVES
80-80073T Titanium Valve - Yamaha YZ250F 2001-2013 - Intake STD 23.00mm/0.906" $117.00(7) Check Stock
80-80075T Titanium Valve - Yamaha YZ250F 2001-2013 - Intake STD (Center) 23.00mm/0.906" $117.00(7) Check Stock
80-80077T Titanium Valve - Yamaha YZ250F 2001-2013 - Exhaust STD 24.50mm/0.965" $117.00(7) Check Stock
80-80912T Titanium Valve - Yamaha YZ250F 2014-2016 - Intake STD 31.00mm/1.220" $117.00(7) Check Stock
80-80916T Titanium Valve - Yamaha YZ250F 2014-2016 - Exhaust STD 25mm/0.984" $117.00(7) Check Stock
VALVE CONVERSION KIT
80-80850 Steel Valve Conversion Kit - Yamaha YZ250F 2001-2013 - Intake Only $403.00(7) Check Stock
SPRING KIT
80-80066 Racing Lightweight Valve Spring Kit - Yamaha YZ250F 2001-2013 $461.00(7) Check Stock
80-80900 Racing Lightweight Valve Spring Kit For Ti Valve - Yamaha YZ250F 2014-2018 $320.00(7) Check Stock
80-80970 Intake Only Valve Spring Kit With Titanium Valve - Yamaha YZ250F 2014-2018 $380.00(7) Check Stock
80-81400 Racing Lightweight Valve Spring Kit For S.S. Valve - Yamaha YZ250F 2014-2018 $320.00(7) Check Stock
80-82300 Racing Lightweight Valve Spring Kit - Yamaha YZ250F 2019-2021 $320.00(7) Check Stock
VALVE GUIDES
80-80920 Valve Guide - Yamaha YZ250F 2014-2016 - Intake STD (0.3957") $22.95(7) Check Stock
80-80921 Valve Guide - Yamaha YZ250F 2014-2016 - Intake OS +0.001" $22.95(7) Check Stock
80-80922 Valve Guide - Yamaha YZ250F 2014-2016 - Intake OS +0.002" $22.95(7) Check Stock
80-80929 Valve Guide - Yamaha YZ250F 2014-2016 - Intake OS +0.010" $22.95(7) Check Stock
80-80930 Valve Guide - Yamaha YZ250F 2014-2016 - Exhaust STD (0.3563") $22.95(7) Check Stock
80-80931 Valve Guide - Yamaha YZ250F 2014-2016 - Intake OS +0.001" $22.95(7) Check Stock
80-80932 Valve Guide - Yamaha YZ250F 2014-2016 - Intake OS +0.002" $22.95(7) Check Stock
80-80933 Valve Guide - Yamaha YZ250F 2014-2016 - Intake OS +0.010" $22.95(7) Check Stock
VALVE GUIDE SEALS
80-80072 Valve Stem Seals - Yamaha YZ250F 2001-2013 (Exhaust Only) (pk of 2) $15.95(7) Check Stock

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