2026 KPMI Full Catalog V1 - Flipbook - Page 296
YAMAHA YZ 250F 2014-'18 / WR 250F & YZ 250FX 2014-'19
®
™
™
™
YAMAHA
Components • Replacement • Top End Service Kit for WR / YZ 250F 2014-2016
Speci昀椀cation
KPMI P/N
Description
80-81400
Spring Kit
80-80912
Intake, Standard Valve
Valves • Black Diamond™ • Black Nitroneg Stems
80-80916
Exhaust, Standard Valve
Valves • Black Diamond™ • Black Nitroneg Stems
80-81201
Gasket Kit
Includes: Ti Retainers, CrSi Valve Springs, H.T. Steel Basewashers
Includes: Head Gasket 77mm Bore (1), Base Gasket (1), Exhaust Gasket (1), Cam Chain Tensioner Gasket
(1), Ex. Valve Stem Seal (2), In. Valve Stem Seal (2), Cylinder Head Drain Seal (1), Cam Chain Tens. Crush
Seal (1), TPS O-ring (1)
These components are intended for use with the KPMI® Top End Kit and are not intended for OEM compatibility.
Cylinder Head Service Kit
KPMI P/N
Type
80-82410
Max Valve Lift Installed Height Seat Pressure
Open Pressure
@ Lift
Intake
.395”
1.150”
55#
151#
.395”
Exhaust
.370”
1.100”
46#
119#
.370”
2
Kit Includes
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 Std. Black Diamond™ Valves
2
Ex Std. Black Diamond™ Valves
2
In Std. C674 Valve Guides
2
Ex Std. C674 Valve Guides
1
Top End Gasket Kit
Components • Replacement • Cylinder Head Service Kit
Speci昀椀cation
KPMI P/N
Description
80-81400
Spring Kit
80-80912
Intake, Standard Valve
Valve • Black Diamond™ • Black Nitroneg Stems
80-80916
Exhaust, Standard Valve
Valve • Black Diamond™ • Black Nitroneg Stems
80-80920
Intake, Standard Valve Guide
Valve Guide • C674 Bronze
80-80930
Exhaust, Standard Valve Guide
Valve Guide • C674 Bronze
80-82411
Gasket Kit
Includes: Ti Retainers, CrSi Valve Springs, H.T. Steel Basewashers
Includes: Head Gasket 77mm Bore (1), Base Gasket (1), Exhaust Gasket (1), Cam Chain Tensioner Gasket
(1), Ex. Valve Stem Seal (2), In. Valve Stem Seal (2), Cylinder Head Drain Seal (1), Cam Chain Tens. Crush
Seal (1), TPS O-ring (1)
Valve Guides • C674 Bronze
A
B
C
D
E
0.350”
0.360"
0.535"
0.905"
0.430"
F
G
0.1962" 0.3957" / Std.
+0.010”
0.330”
0.340"
0.615"
1.015"
0.391"
Intake
Exhaust
80-80920
80-80929
80-80930
0.1760" 0.3563" / Std.
80-80939
+0.010”
Valve Guide Seal Kits • High Performance
278
Part Number
order 650-557-2046
Intake Stem
Diameter
O.L
Seal
O.D.
Seal
Style
5.0mm
0.350"
0.405"
4
Exhaust Stem
Diameter
O.L
Seal
O.D.
Seal
Style
4.5mm
0.331"
0.370"
4
80-80990
Kit Includes
Designed for these guide specs
A
B
C
0.340”±0.005”
0.303”
0.125”
Designed for these guide specs
A
B
C
0.321”±0.002”
0.281”
0.120”
2
Intake Viton® Seals
2
D
0.230”
D
0.240”
Exhaust Viton® Seals
