523

CLASSIC

Forged Piston Kits

MC Moly Coated Piston Kits feature cast construction with
moly (moS

) coating which helps reduce friction and wear,

while allowing adequate break in. Hastings Moly Rings Set,
wrist pins and locks included. 8.5:1 comp ratio.

Size 3⁷⁄₁₆” 74”

3¹⁄₂” 80”

1948-84 Rings

1978-84

Rings

FLH-FX

FLH-FXE

Standard

11-0267 11-1368 11-0273

11-1363

.010

11-0268 11-1369 11-0274

11-1364

.020

11-1370 11-0275

11-1365

.030

11-1371

11-1366

.040

11-0271 11-1372 11-0277

11-1367

.050

11-0272 11-1373 —

—

Wiseco Replacement Wrist Pins are sold each.
VT No.   Bore Size
11-9776  3³⁄₁₆” and 3⁷⁄₁₆”
11-9777  3¹⁄₂”

Wiseco Replacement Circlips fit all Wiseco pistons,
available in pairs. Fits 3⁷⁄₁₆” and 3¹⁄₂” bore pistons.
VT No. 11-9773

Piston Kit

11-9725

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

11-0267

11-2204

11-0273

Note: Piston Kits include Hastings X Ring.
Note: Rings are packaged per piston.

1948-78 1200/74” FL-FLH 9:1 Compression 3⁷⁄₁₆” Bore.

Piston Kit

Wiseco Rings

Standard

11-9725

.010

11-9726

11-9754

.020

11-9727

11-9755

.030

11-9728

.040

11-9729

.050

11-9730

11-9758

.060

11-9731

11-9759

.080

11-9732

11-9760

1978-84 1340/80” Shovelhead 7:1 Compression 3¹⁄₂” Bore.

Piston Kit

Wiseco Rings

Standard

11-9733

11-9759

.020

11-9735

11-9760

.030

11-9736

11-9764

.040

11-9737

11-9765

1978-84 1340/80” Shovelhead 8.5:1 Compression 3¹⁄₂” Bore.

Piston Kit

Wiseco Rings

STD

11-9444

11-9759

.010

—

11-9762

.020

11-9446

11-9760

.030

11-9447

11-9764

.040

—

11-9765

1978-84 1340/80” Shovelhead 9.5:1 Compression 3¹⁄₂” Bore.

Piston Kit

Wiseco Rings

STD

11-9738

11-9759

.010

11-9739

11-9762

.020

11-9740

11-9760

.030

11-9741

11-9764

.040

11-9742

11-9765

The Keith Black 390 Hypereutectic alloy is cast in a per-
manent steel mold.

Engine

Panhead
Shovelhead

1340cc
Shovelhead

Model

FLH-FX

Years

1941-79

1980-84

C.I.D.

74”

80”

Bore

3.438”

3.498”

Stroke

3.969”

4.250”

Head Type

.656 Dome

.426 Dome

Cylinder Height 5.330”

5.330”

Compression
Ratio

9.0:1

7.2:1

8.3:1

Standard

11-2200

—

11-2251

.005

11-2201

11-2235

11-2252

.010

11-2202

11-2236

11-2253

.020

11-2203

11-2237

11-2254

.030

11-2204

—

11-2255

.040

11-2205

—

11-2256

.050

11-2206

—

.060

11-2207

—

.070

11-2208

—

.080

11-2209

—