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PERFORMANCE MOTORCYCLE PARTS AND KITS FOR AMERICAN V-TWINS

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Stroker Pistons for 1972-'85 Harley-Davidson® Sportster® Models

 
 
 
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$318.95
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Description
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Fitment
Instructions

These 3 3⁄16" bore stroker pistons are designed to be used in conjunction with S&S 4 5⁄8" stroke flywheels to convert 1000cc ironhead engines in 1972-'85 Harley-Davidson® Sportster® models to 1200cc (74") displacement.

These pistons can also be used to replace pistons in older S&S stroker engines with 4 1⁄16", 4 9⁄16", 4 1⁄2", and 4 13⁄16" stroke flywheels. All clearances must be checked. See chart below for displacements and compression ratios. These pistons are normally used in stock Harley-Davidson® cylinders. No cylinders are available from S&S for ironhead Sportster models.

 

 

Stroker Pistons for 1972-'85 Harley-Davidson® Sportster® Models
Size   Part Number  
 +.010    106-5542  
 +.020    106-5543  
 +.030    106-5544  
 +.060    106-5791  
 Piston Deck Height    .806"  
  Recommended Piston Fit: Close: .0030"-.0035" Loose: .0045"-.0055"  

 

 

 

 

 Stroker Pistons Specifications for 1972–'85 Harley-Davidson® Sportster® Models 
Displacement    71"    72"    73"    74"    77" *  
Stroke    4 7⁄16"    4 1⁄2"    4 9⁄16"    4 5⁄8"    4 13⁄16"  
Cylinder Length    5.330"    5.330"    5.330"    5.330"    5.330"  
Compression    7.5:1    8:1    8.5:1    9:1    9:1  
*If replacing the pistons in a older 77" stroker engine, stroker plates are required, and all clearances must be checked.

 

 

Notes: If replacing the pistons in a older 77" stroker engine, stroker plates are required, and all clearances must be checked.
S&S offers machine shop services through the S&S remanufacturing program. New pistons can be fit to your existing cylinders for a reasonable charge.

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