2026 KPMI Full Catalog V1 - Flipbook - Page 44
HD KNUCKLEHEAD 1936-1947
®
™
HARLEY-DAVIDSON
Valve Spring Kit • O. E. M. Replacement
Kit Includes
KPMI P/N
Type
Intake
20-20425
Exhaust
Max Valve Lift
H. T. Steel
Retainers
H. T. Steel
Keepers Pr.
4 20-20426
4
Installed Height
CrSi Valve
Springs
20-20429
H. T. Steel
Basewashers
20-20427
4
4
20-20428
Open Pressure
Seat Pressure
@ Lift
.415”
1.375"
127#
270#
.415"
All KPMI® retainers are designed using the latest CAD software available. Further, the retainers are tested using 昀椀nite element analysis (FEA) to ensure the
retainer can endure high stress levels during operation. By using billet aircraft alloy material, heat treating it, and then employing our high powered design
software, KPMI® is able to maximize weight saving by incorporating a series of drilled holes in the retainers. These retainers are both strong and light,
allowing signi昀椀cant reduction to overall valvetrain mass, which is known to improve performance. All components are the quality you can expect from KPMI®,
manufactured to exact O.E.M. dimensions. These O.E.M. replacements parts may be purchased separately using the above part numbers.
Engine Kit with O. E. M. Replacement Spring Kit
KPMI P/N
Type
Max Valve Lift Installed Height Seat Pressure
Open Pressure
@ Lift
270#
.415”
Intake
20-22050
.415”
1.375"
127#
Exhaust
Kit Includes
4
In / Ex H. T. Steel Retainers
4
In / Ex H.T. Steel Keeprs Pr.
4
In / Ex CrSi Valve Springs
4
In / Ex H. T. Steel Basewashers
2
In Std. Black Diamond™ Valves
2
Ex Std. Black Diamond™ Valves
Components • Replacement • Engine Kit
KPMI P/N
Description
20-20425
20-4101
20-4102
Spring Kit, OEM Replacement
Speci昀椀cation
Includes: H. T. Steel Retainers, CrSi Valve Springs, H.T. Steel Basewashers, H.T. Steel Keeprs
Intake, Standard Valve
Valve • Black Diamond™ • Black Nitroneg Stems
Exhaust, Standard Valve
Valve • Black Diamond™ • Black Nitroneg Stems
Valve Kit • Black Diamond™ • Black Nitroneg Stems
KPMI P/N
20-22000
Type
Head Diameter
Stem
Diameter
Tulip
Radius
O. L.
Angle
Remarks
Intake
1.750”
44.45mm
0.3765"
R0.234
23°
3.590"
Standard
Exhaust
1.750”
44.45mm
0.3760"
R0.236
27°
3.670”
Standard
2
Kit Includes
In Std. Black Diamond™ Valves
2
Ex Std. Black Diamond™ Valves
Valves • Black Diamond™ • Black Nitroneg Stems
O. L.
Remarks
0.3765"
Tulip
Radius
Angle
R0.234
23°
3.590"
Standard
49.28mm
0.3765"
R0.234
23°
3.590"
Oversize
44.45mm
0.3760"
R0.236
27°
3.670”
Standard
KPMI P/N
Type
Head Diameter
Stem
Diameter
20-4101
Intake
1.750”
44.45mm
20-20414
Intake
1.940”
20-4102
Exhaust
1.750”
Valve Guides • Cast Iron
A
0.600"
26
F
G
0.3755" 0.6440" / Std.
+0.002”
+0.004”
+0.006”
+0.008”
+0.025”
For sizing KPMI® Cast Iron Valve Guides please use Reamers and Ball Hones listed in HD® Tool section (Pg.90-93).
order 650-557-2046
B
0.700”
C
0.700”
D
1.200"
E
1.050"
Intake
Exhaust
20-4095C
20-4096C
20-4097C
20-4098C
20-4099C
20-4100C
