2026 KPMI Full Catalog V1 - Flipbook - Page 305
YAMAHA YZ 450F 2010-2013
®
™
YAMAHA
Valve Spring Kit • Lightweight Racing
KPMI P/N
Type
80-80750
Max Valve Lift Installed Height
Seat Pressure
Open Pressure
@ Lift
Intake
.450”
1.185"
46#
155#
.450"
Exhaust
.450”
1.185"
46#
155#
.450"
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
Kit Includes
The use of KPMI® guides(#80-8077X and #80-8078X) may be necessary when using higher than stock lift cams.
Intake Only • Steel Valve Conversion Kit
Seat Pressure Open Pressure
KPMI P/N
Type
Max Valve Lift
Installed Height
80-81050
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
155#
Kit Includes
@ 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
1.417"
0.2158"
20º
3.280"
Standard
37.00mm
1.457"
0.2158"
20º
3.280"
Oversize
30.00mm
1.181"
0.2155"
20º
3.385”
Standard
KPMI P/N
Type
Head Diameter
80-80762
Intake
36.00mm
80-80763
Intake
80-80766
Exhaust
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
80-80762T
Intake
36.00mm
1.417"
0.2160"
20º
3.280"
Titanium
33D-12111-00-00
80-80766T
Exhaust 30.00mm
1.181”
0.2155”
20º
3.375"
Titanium
33D-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
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
80-80770
+0.001”
80-80771
+0.002”
80-80772
+0.010”
80-80779
0.4352” Std.
+0.001”
+0.002”
+0.010”
Exhaust
80-80780
80-80781
80-80782
80-80789
287
A
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