2026 KPMI Full Catalog V1 - Flipbook - Page 49
HD SPORTSTER 1957-1969
®
™
KPMI P/N
Type
H. T. Steel
Retainers
Intake
20-20440
H. T. Steel
Keepers Pr.
4 20-20441
Exhaust
Kit Includes
CrSi Valve
Springs
20-4275
4
H. T. Steel
Basewashers
20-2215
4
20-20085
4
Max Valve Lift
Installed Height
Seat Pressure
Open Pressure
@ Lift
.400”
1.245"
95#
330#
.400"
Harley-DaviDson
Valve Spring Kit • O. E. M. Replacement
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
330#
.400"
Intake
20-22250
.400”
1.245"
95#
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
20-20440
20-4258
20-4197
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
20-22200
Type
Radius
0.3090"
R0.375
0.3384"
R0.236
In Std. Black Diamond™ Valves
2
Intake
1.825”
46.36mm
Exhaust
1.570”
39.88mm
Kit Includes
2
Tulip
Stem
Diameter
Head Diameter
O. L.
Remarks
23°
3.562"
Standard
29°
3.512"
Angle
Standard
Ex Std. Black Diamond™ Valves
Valves • Black Diamond™ • Black Nitroneg Stems
Tulip
KPMI P/N
Type
Head Diameter
Stem
Diameter
Radius
Angle
20-4258
Intake
1.825”
46.36mm
0.3090"
R0.375
20-4197
Exhaust
1.570”
39.88mm
0.3384"
20-4197-1
Exhaust
1.630"
41.40mm
0.3384"
KPMI P/N
Type
10-SC541
Intake
2.132”
54.15mm
1.690”
42.93mm
0.450”
11.43mm
Pkg. of 1
10-SC446
Exhaust
1.757”
44.62mm
1.375”
35.00mm
0.450”
11.43mm
Pkg. of 1
O. L.
Remarks
23°
3.562"
OEM18071-58
R0.236
29°
3.512"
OEM18080-58R
R0.236
29°
3.512"
Oversize
Valve Seats • Powdered Metal
I. D.
Height
Quantity
KPMI’s proprietary seat material is compatible with leaded and unleaded fuels including methanol and ethanol fuel blends. This material o昀昀ers excellent
thermal characteristics and resists microwelding that leads to seat and valve face recession. Leading edge has generous radius to ease installation.
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O. D.
