2026 KPMI Full Catalog V1 - Flipbook - Page 307
YAMAHA VARIOUS YZ / WR 450's 2014-'21
®
YZ™ 450F 2014-'19
™
YZ™ 450FX 2016-'20
•
WR™ 450F 2016-'21
•
YAMAHA
•
™
Intake Only • Steel Valve Conversion Kit
Seat Pressure Open Pressure
KPMI P/N
Type
*Max Valve Lift
Installed Height
80-81100
Intake
.450”
1.185"
46#
2
Intake Titanium Retainers
2
Intake CrSi Valve Springs
2
Intake H. T. Steel Basewashers
2
Intake Black Diamond™ Valves
Kit Includes
155#
@ Lift
.450”
The use of KPMI® guides(#80-8077X and #80-8078X) may be necessary when using higher than stock lift cams.
Valves • Black Diamond™ • Black Nitroneg Stems
Stem Diameter
Tulip
O. L.
Remarks
1.457"
0.2158"
20º
3.280"
Standard
1.201"
0.2155"
28º
3.380”
Standard
KPMI P/N
Type
Head Diameter
80-80872
Intake
37.00mm
80-80876
Exhaust
30.50mm
Must use Kibblewhite® Lightweight Valve Spring Kits when installing Black Diamond™ Valves.
Valves • O.E.M. Replacement • Tensilite® • Chromium Nitride PVD Coated Titanium
KPMI P/N
Type
Head Diameter
Stem
Diameter Tulip
O. L.
Material
Rep. OEM P/N
80-80872T
Intake
37.00mm
1.457"
0.2160"
18º
3.280"
Titanium
1SL-12111-00-00
80-80876T
Exhaust 30.50mm
1.201"
0.2155"
28º
3.375”
Titanium
1SL-12121-00-00
Note: These valves are intended as O.E.M. replacement valves and are completely compatible with the O.E.M. spring kits. However, experienced engine
builders, who are running aggressive camshafts or higher than factory RPM’s may 昀椀nd the combination of the O.E.M. Style Valve and KPMI’s Lightweight Racing
Spring Kits advisable. All titanium valves are (Tensilite®) PVD CrN coated, and all stainless valves are Black Diamond™ coated.
Valve Guides • C630 Bronze
A
B
C
D
E
0.540”
0.540”
0.560”
0.775"
0.432"
0.390”
0.390”
0.760”
1.030"
0.432"
F
G
0.2160" 0.4352” / Std.
0.2155"
Intake
Exhaust
80-80770
+0.001”
80-80771
+0.002”
80-80772
+0.010”
80-80779
0.4352” Std.
+0.001”
+0.002”
+0.010”
80-80780
80-80781
80-80782
80-80789
Stem Diameter
O.L
Seal O.D.
Seal Style
5.5mm
0.333"
0.455"
2
A
0.365”±0.002”
Part Number
71040-4
71040-8
71040-16
71040-50
71040-100
Designed for these guide specs
B
C
D
0.325”
0.120”
0.235”
Quantity
Pkg. of 4
Pkg. of 8
Pkg. of 16
Pkg. of 50
Pkg. of 100
Type
Intake
Exhaust
Quantity Discount
0%
0%
Less- 10%
Less- 15%
Less- 20%
289
Valve Guide Seals • Viton®
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