2026 KPMI Full Catalog V1 - Flipbook - Page 36
BSA B50 GOLDSTAR 1971-1973
®
™
BSA
Valve Spring Kit • Lightweight Racing
KPMI P/N
Type
Max Valve Lift Installed Height
Seat Pressure Open Pressure
@ Lift
Intake
10-10050
.500”
1.375"
80#
258#
.500”
Exhaust
2
Kit Includes
CrSi Valve Springs
2
H. T. Steel Retainers
2
H. T. Steel Basewashers
The springs in these kits are wound from super clean chrome silicon wire that has been heat treated and shot peened. These components o昀昀er optimal 昀椀tment,
keeping lateral movement to a minimum. They work together as a system, providing long life, and maximum performance.
Valves • Black Diamond™ • Black Nitroneg Stems
KPMI P/N
Type
10-10062
Intake
44.45mm
10-10066
Exhaust
38.86mm
Stem Diameter
Tulip
O. L.
Remarks
1.750”
0.3105”
20°
4.080”
Standard
1.530”
0.3100”
24°
4.025”
Standard
Head Diameter
Valve Guides • Manganese Bronze
A
B
C
D
E
F
G
Intake
0.465”
0.675”
0.910”
1.215”
0.560”
0.3100”
0.5010” / Std.
10-10070
10-10072
10-10074
10-10076
10-10079
+0.002”
+0.004”
+0.006”
No seal required.
Exhaust
+0.050”
Push Rod • Steel • Chrome Moly Tube
KPMI P/N
Type
Material
A
B
Quantity
Intake
• Thin Wall Chrome Moly Tube
• H. T. Steel Tips
8.642"
8.502"
Pkg. of 2
10-10425
Exhaust
Custom length pushrods available upon request.
Blank Pushrods • Steel • Chrome Moly Tube
A
Ø.371” OD
B
9.120” Overall Length
C
Ø.305” ID Before Machining
D
E
F
G
R.124
0.675”
0.375”
0.310”
Machining Information:
1. Break ID edge
only at .015 x 45°
KPMI P/N
Model
Material
Kit Includes
90502-2
Various
• Thin Wall Chrome Moly Tube • H. T. Steel Tips
2 Female Ended Pushrods / 2 Male Endpieces
90502-4
Various
• Thin Wall Chrome Moly Tube • H. T. Steel Tips
4 Female Ended Pushrods / 4 Male Endpieces
18
Blank Pushrods Kits (sets of 2 and 4) can be machined to desired length and assembled by KPMI® for a 昀氀at fee of $120.00. Orders can be placed by using the
Custom Pushrod Order Form found on our website at www.kpmi.us/forms.html.
order 650-557-2046
