2026 KPMI Full Catalog V1 - Flipbook - Page 295
YAMAHA WR / YZ 250F 2001-2013
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™
™
YAMAHA
Valve Guide Seal Kits • High Performance
O.L
Seal
O.D.
Seal
Style
A
B
C
D
4.0mm
0.320"
0.355"
5
0.285”±0.002”
0.245”
0.120”
0.215”
Exhaust Stem
Diameter
O.L
Seal
O.D.
Seal
Style
A
B
C
D
4.5mm
0.331"
0.370"
4
0.321”±0.002”
0.281”
0.120”
0.240”
80-80440
Part Number
Designed for these guide specs
Intake Stem
Diameter
Designed for these guide specs
Kit Includes
3
Intake Viton® Seals
2
Exhaust Viton® Seals
YAMAHA YZ 250F 2014-'18 / WR 250F & YZ 250FX 2014-'19
®
™
™
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Valve Spring Kit • Lightweight Racing for Titanium Valves
KPMI P/N
80-80900
Type
Max Valve Lift Installed Height
Intake
Exhaust
Kit Includes
.425”
1.180"
.400”
1.125"
Seat Pressure
Open Pressure
@ Lift
48#
151#
.425"
119#
.400"
40#
2
In Titanium Retainers
2
In CrSi Valve Springs
2
In H. T. Steel Basewashers
2
Ex Titanium Retainers
2
Ex CrSi Valve Springs 2
Ex H. T. Steel Basewashers
Valve Spring Kit • Lightweight Racing for Stainless Valves
KPMI P/N
80-81400
Type
Max Valve Lift Installed Height
Intake
Exhaust
Kit Includes
.395”
1.150"
.370”
1.100"
Seat Pressure
Open Pressure
@ Lift
55#
151#
.395"
119#
.370"
46#
2
In Titanium Retainers
2
In CrSi Valve Springs
2
In H. T. Steel Basewashers
2
Ex Titanium Retainers
2
Ex CrSi Valve Springs 2
Ex H. T. Steel Basewashers
Intake Only • Titanium Valve Kit
Seat Pressure Open Pressure
KPMI P/N
Type
*Max Valve Lift
Installed Height
80-80970
Intake
.425”
1.180"
48#
Intake Titanium Retainers
Intake H. T. Steel Basewashers
2
2
Kit Includes
2
2
151#
@ Lift
.425"
Intake CrSi Valve Springs
Intake Tensilite® Titanium Valves
* It may be necessary to use KPMI shortened valve guides (KPMI® #80-8092X & 80-8093X) to achieve higher than stock lift.
Top End Service Kit for WR / YZ 250F 2014-2016
Piston
Bore Size
80-81200
77.00mm
Kit Includes
Max
Installed
Seat
Open
@ Lift
Valve Lift
Height
Pressure
Pressure
Intake
.395”
1.150"
55#
151#
.395"
Exhaust
.370”
1.100"
46#
119#
.370"
2 In Titanium Retainers 2 In CrSi Valve Springs 2 In H. T. Steel Basewashers
2 Ex Titanium Retainers 2 Ex CrSi Valve Springs 2 Ex H. T. Steel Basewashers
2
In Black Diamond™ Valves
2
Ex Black Diamond™ Valves
1
High Performance Piston Kit
1
Top End Gasket Kit
Type
IMPORTANT NOTE: The piston assembly (piston, rings, valves, pin and pin clips) in this kit are designed to work together as a system.When
used complete, the piston assembly can be used as an OEM replacement. The individual components are NOT INTERCHANGEABLE with
O.E.M. valves and piston assembly components.
277
KPMI P/N
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