S&S Cycle

1986–2020 HD ® Sportster ® Models

1250 cc CONVERSION KIT FOR 1986–2020 1200cc HARLEY-DAVIDSON ® SPORTSTER ® MODELS

Milwaukee-Eight ®

FITMENT • 1986–2020 1200cc Harley-Davidson® Sportster® models • 1986–2020 883cc Harley-Davidson Sportster models FEATURES & BENEFITS • Forged pistons— coated piston skirts with measurement window • Stock 1986–2020 1200cc cylinders can be bored over to accept these pistons • Pistons have larger than stock valve pockets—accepts up to 2.00" valves OPTIONS • Silver powder coat finish • Wrinkle black powder coat finish KIT CONTENTS • S&S 1250cc pistons w/rings and wristpins • S&S 39/16" bore cylinders • MLS head, base, and exhaust gaskets • Assembly lube • Instructions

96 ™ /103 ™ /110 ™

2007–2017 Twin Cam

1999–2006 Twin Cam 88 ®

Sportster ® & Buell ® Indian ® Models Street Rod ™

1986–2020

910-0692

2014–2019 Street ® &

1250cc CYLINDER AND PISTON CONVERSION KITS Fitment Piston Type

Compression Ratio

Finish

Part #

910-0689 910-0691 910-0690 910-0692

Silver

S&S Forged Flat top

10.3:1

Wrinkle Black

1986–2020 Sportster®

Silver

S&S Forged 5.5cc dome 11.2:1

Wrinkle Black

*The cylinder fin profile does not perfectly match the fins on 2004 and later stock heads, but the difference is not considered to be objectionable. See Photos. Compression ratios given are with 60cc combustion chambers. DISCLAIMER: NOT LEGAL FOR SALE OR USE IN CALIFORNIA ON ANY POLLUTION CONTROLLED MOTOR VEHICLE. NOT LEGAL FOR SALE OR USE NATIONWIDE ON ANY FEDERAL POLLUTION CONTROLLED MOTOR VEHICLE UNDER THE CLEAN AIR ACT

Can not run stock 883 cylinder heads with this kit. 883 heads may be used if S&S CNC porting is performed. PN 909-0011 The cylinder fin profile does not perfectly match the fins on 2004 and later stock heads, but the difference is not considered to be objectionable. See photo. S&S does not recommend boring 2004 and later 883cc cylinders from 3" to 31/2" bore to increase engine displacement to 1200cc due to changes in factory cylinder and liner. A smaller O.D. liner and large chamfer on the bottom of the spigot make boring the 883 cylinder not possible. New cylinders are recommended. This kit is not compatible with the stock ignition.

Tools & Shop Supplies

NOTES

Warranty & Company Policy

S&S cylinders match the fin profile on 1986–’03 cylinder heads. Although there is a slight difference in the fin profiles of S&S cylinders and stock 2004 –’20 cylinder heads (shown above), the look is generally not considered to be objectionable. You decide!

Index

Appendix &

253