S&S Cycle

1926–'84 vintage engines

1984–1999 Evolution ® 1926–1984 Vintage Engines Tools & Shop Supplies Warranty & Company Policy Appendix & Index

FORGED 3-5/8" BORE PISTONS FOR 1936–’84 OHV ENGINES FITMENT • 88", 93", 96", 98" and 103" engines for 1936–’84 OHV big twins FEATURES AND BENEFITS • Forged pistons for superior strength • Modern alloys and piston skirt profiles for low noise and long engine life • Dome volume 30cc • Piston kits include set of pistons, rings, wristpins, and clips OPTIONS • Available in 35/8" Standard. +.010", .020", .030", and .060"oversizes S&S will fit these pistons to your existing cylinders (when purchasing new cylinders, pistons can be fit to them as an option)

106-5535

S&S® 35/8" BORE FORGED PISTON APPLICATION CHART

Cylinder Length

Wristpin Deck Height

Flywheel Diameter

Displacement

Stroke

Compression Ratio

SH-Series & P-Series Engines

KN-Series Engines

88" 93"

1.260" 1.260" 1.260" 1.260" 1.260" 1.260"

41/4" 41/2" 41/2" 45/8" 43/4"

81/2" 81/2" 81/2" 81/2" 81/2" 81/4"

7.5:1 8.5:1 9.1:1 9.1:1 8.9:1 9.7:1

5.330" 5.405" 5.363" 5.440" 5.530" 5.630"

–

5.625"

93" HC

– – – –

96" 98"

103"

5"

REPLACEMENT RINGS FOR FORGED 35/8 BORE PISTONS Oversize Part # Standard (35/8") 94-1220X +.010" 94-1221X +.020" 94-1222X +.030" 94-1223X +.060" 94-1226X

FORGED 35/8" BORE PISTON SETS FOR 1936–’84 OHV BIG TWINS Oversize Wristpin Deck Height Part # Standard (35/8") 1.260" 106-5535 +.010" 1.260" 106-5536 +.020" 1.260" 106-5537 +.030" 1.260" 106-5538 +.060" 1.260" 106-5789 Recommended Piston Fit Close: .003" - .0035" Loose: .004" - .005" NOTE: Compression ratios will change when replacing existing pistons in S&S engines with this series of forged pistons. If higher compression is desired, we suggest shortening cylinders, or decking heads to achieve the desired compression ratio. A change of .060" will produce approximately 1 point of change in the compression ratio.

REPLACEMENT WRISTPINS AND KEEPERS Description Part # Wristpin .791" diameter 106-6123 Wristpin keeper, c-clip each 94-9254-S 4 pack 94-9254

145