Ss-cycle Bore Big Twin Stroker Kit 1936–1999 3 7/16 - 3 1/2 User Manual Page 1

IMPORTANT NOTICE:Statements in this instruction sheet preceded by the following words are of special signicance.WARNINGMeans there is the possibility

10Excessive material removed from frame may cause structural damage and possible failure resulting in personal injury to you or others near you. C. I

11BREAKIN PROCEDUREThis procedure applies to all engines with close t pistons. NOTE: 

3⁄ - 3½ Big Bore Twin Stroker Kit 1936-1999121. Lower Oil Return Holes (Pan & Shovel) Big Twin cylinder oil return holes must be lowered in t

132. Piston and Cylinder Fitting (All) Fit pistons to cylinders using piston tting instructions provided. Check ring end gap and adjust as necessa

14NOTE: Early panhead cases are not as strong and a

15C. Install both cylinders and secure each with one nut.NOTE:D. Rotate ywheel until rods

16NOTES:  

17Improper breather timing causes poor oil scavenging from ywheel cavity and incorrect crankcase air pressure. These conditions may cause unwarranted

18NOTE: 5. Cam, Lifters and Tappet Blocks (All)NO

19Insucient clearance between piston and valves may cause them to contact each other during operation resulting in damage to piston and valve train c

2Flywheels assembled improperly prior to being dynamically balanced may sustain irreversible damage to mainshaft and crankpin tapers during actual bal

20

3S&S® FLYWHEEL ASSEMBLY TORQUE SPECIFICATIONSStock Harley-Davidson® ShaftsS&S Shafts (Street) S&S Shafts (Racing)Big TwinSprocket Shaft 29

41. Crankcase Alignment & Cylinder Mounting Studs (All)NOTE:

5Inadequate clearance between rods or too much clearancing on rods will cause unwarranted stress on connecting rods, rod bearings, pistons, etc. resul

6C. Inspect keyways and oil holes for burrs in ywheels and remove if necessary.D. With key in shaft, insert into respective tapered hole in ywheel

7NOTE: 

8Visual ProcedureA. Install pistons on rods without rings or wristpin clips. Bolt cylinders with gaskets in place.B. Move piston tight towards camsi

9Use of spiral-loc type wristpin retainers with wristpins with beveled ends could result in wristpin retainer failure and major damage to engine. PTFE