2026 KPMI Full Catalog V1 - Flipbook - Page 304
YAMAHA VARIOUS 450cc 2003-'25
®
YAMAHA
•
•
WR™ 450 2003-'15
YZ™ 450F 2003-'09
•
•
•
YFZ™ 450 2004-'09
YFZ™ 450X 2008-'11
YFZ™ 450R & SE 2009-'25
Valve Guides • C674 Bronze
A
B
C
D
E
F
0.350”
0.385"
0.480”
0.680"
0.430"
G
Intake
0.1768" 0.3957" / Std.
0.385"
0.510”
0.680"
0.430"
80-80220
80-80229
+0.010”
0.350”
Exhaust
80-80230
0.1961" 0.3957" / Std.
80-80239
+0.010”
Valve Guide Seal Kits • High Performance
Part Number
In / Ex Stem
Diameter
O.L
4.5mm /
0.331"
Designed for these guide specs
Seal
O.D.
Seal
Style
A
B
C
D
0.370"
4
0.321”±0.002”
0.281”
0.120”
0.240”
80-80710
Kit Includes
3
Intake Viton® Seals
2
Exhaust Viton® Seals
Keeper Set • O.E.M. Replacement
“B”
KPMI P/N
Style
80-80715
Single
Radius Bead
Type
A
B
C
D
E
Quantity
Intake
0.177"
6.0°
0.186"
0.221”
0.212”
3 Pr.
Exhaust
0.196"
6.5°
0.181"
0.216”
0.270”
2 Pr.
“D”
“C”
A
E
Note : The bead height is referenced from the minor diameter of the keeper to the center of the bead.
Cylinder Head Stud Kit for WR 450F 2007-'15 / YZ 450F 2006-'09 / YFZ450R & SE 2009-'23
KPMI P/N
Body Dia.
O. L. "C"
A
B
Remarks
80-82800
0.358"
7.0”
1.45”
1.45”
Standard
Kit Includes
4
H.T. Steel Studs
4
H.T. Steel Nuts
4
H.T. Steel Washers
KPMI® Cylinder Studs are made from 180,000 psi yield strength, 昀椀ne grain, heat treated, aircraft grade alloy steel. When you want a stud that meets proof-stress
and maximizes clamping force, look no further. KPMI® “rolls” the threads, heat treats and then centerless grinds the entire body of the stud. Rolling the threads
creates the toughest and strongest thread possible and centerless grinding removes notch sensitivity. The 昀椀nal process for all KPMI® Studs is to encase the entire
stud with premium corrosion resistant treatment of Black Oxide. Congratulations on your choice to purchase a stud that meets and exceeds your stock-replacement
of high-performance needs!
Cylinder Head Nuts for WR 450F 2007-'15 / YZ 450F 2006-'09 / YFZ450R & SE 2009-'23
KPMI P/N
Hex Pattern
Material
O. L.
F. D.
Thread
Quantity
41010-4
12mm
H. T. Steel
0.400”
0.700”
M10 x 1.25
Pkg. of 4
Replacement nuts for Stud Kits, #80-82800, but can be used for general purpose (see diagram for detail)
286
KPMI® nuts are single point machined from high tensile strength Aircraft Alloy Steel. During the machining process close tolerances and smooth surface 昀椀nishes are
maintained. Two critical factors for achieving correct 昀椀t and torque. After machining, the nuts are heat treated to a speci昀椀c depth. This creates hard, wear resistant working
surfaces, while retaining a ductile core to prevent cracking under load. The premium black oxide treatment provides excellent corrosion resistance and appearance.
order 650-557-2046
