487
S&S Button Style Keepers available in different thickness to con-
trol wristpin end play which varies with bore size. Button style keep-
ers must be fully supported by wrist pin hole. Sold in pairs.
VT No.
Range
Type
3 5/8" Bore
STD to +.030 Teflon
+.040 to +.070 Teflon
3 7/16" and 3 1/2" Bore
STD to +.040 Teflon
+.050 to +.090 Teflon
Note: Piston Kits include Hastings X Ring.
1948-78 1200 74" FL-FLH 9:1 Compression 3 7/16" Bore.
Piston Kit
Wiseco Rings
STD
.010
.020
.030
.040
.050
.060
.080
1978-84 1340 80" Shovel 7:1 Compression 3 1/2" Bore.
Piston Kit
Wiseco Rings
STD
.010
.020
.030
.040
1978-84 1340 80" Shovel 9.5:1 Compression 3 1/2" Bore .
Piston Kit
Wiseco Rings
STD
.010
.020
.030
.040
Forged Piston Kits
The Keith Black 390 Hypereutectic alloy is cast in a permanent
steel mold.
Engine
Pan
1340cc 1340cc
Shovel Shovel Shovel
Model
FLH-FX FLH-FX FLH-FX
Years
1941-79 1980-84 1980-84
C.I.D.
74"
80"
80"
Bore
3.438"
3.498" 3.498"
Stroke
3.969"
4.250" 4.250"
Head Type .656 Dome .426 Dome
Cyl Height 5.330"
5.330" 5.330"
Comp. Ratio 8.5:1
8.0:1
9.5:1
STD
.005
.010
.020
.030
.040
.050
—
—
.060
—
—
.070
—
—
.080
—
—
MC Moly Coated Piston
Kits feature cast construc-
tion with moly (moS
2
)
coating which helps
reduce friction and wear,
while allowing adequate
break in. Hastings Moly
Rings Set, wrist pins and
locks included.
Size 3
7
/
16
" 74" 3
1
/
2
" 80"
1948-84 1978-84
FLH-FX
FLH-FXE
—
Wiseco Replacement Wrist Pins are sold each.
VT No. Bore Size
Wiseco Replacement Circlips fit all Wiseco pistons,
available in pairs. Fits 3 7/16" & 3 1/2" Bore Pistons.
Piston Kits
SHOP TIP Piston Installation
Caution: Do not install piston pin without lubricating it first with motor oil or assembly lube.
Touch up outer edges of piston pins with emery cloth before installation.
1. Refer to applicable service manual for proper installation methods.
2. Piston should be measured front-to-rear at the base of piston skirt, perpendicular to wrist
pin.
3. Piston should be set-up with the following tolerances:
Recommended piston/cylinder running clearances:
Minimum Maximum Preferred
Evolution® Models .0015 .0022
.002
(Aluminum Cylinders)
Big Twin Models
.0015 .003
.0025
(Cast Iron Cylinders)
Sportster Models
.003
.004
.0035
(Cast Iron Cylinders)
Specifications for ring end-gap are supplied with the ring sets and vary by type and size.
Note: Run engine at moderate speeds for at least 500 miles, avoiding excessive running in
lower gears, in order to properly break-in new pistons and rings.
KB PERFORMANCE PISTONS
