+.020" Stroker Pistons for 1972-'85 Harley-Davidson® Sportster® Models
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. | |||||
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