S&S Cycle

S&S MK136 Black Edition Engine

S&S Cycle is introducing what it describes as "the next generation of 'Proven Performance' for 2017 and newer H-D Touring models" - the 49-state MK136 engine.

This is the newest version of the complete crate engines S&S has been known for since it introduced its first ever, game-changing, scratch-built 98"/1,600 cc 'Sidewinder' in 1993.

Building on the popularity of the 1,200 cc (73") 'Shovelhead' style engine it had launched in 1990, the 'Sidewinder' exploited the market opportunity that Harley themselves created a couple of years later when it withdrew from the crate motor segment. The rest, as they say, is history.

This 'ready-to-install' Black Edition 136 incher (2,220 cc) slips into the stock 2017-2023 oil-cooled M-8 frame. S&S took its MK-Series crankcases, married them to the 136” cylinders and flywheels, and then fitted high-flow cylinder heads with +1 mm valves and .605" springs. 

"stock 2017-2023 oil-cooled M-8 frame"

The seats, guides, valves, seals and +1 mm oversized intake and exhaust valves are all premium grade. The valves are .030” longer than stock for improved valvetrain geometry (.605” max. lift valve springs) and the high-strength alloy used in casting the cylinder heads gives the improved strength at high temperatures that is needed.

There is an enlarged cooling passage around the exhaust seats, and the MK136 uses S&S exclusive breather boxes, forged pistons, an S&S performance oil pump and cam support plate, with premium tappets and tappet cuffs.

Sprocket shaft spacer is included, with Champion spark plugs. The MK 136 retains the stock engine height. 

"valves are .030" longer than stock"

The crankcase has patented dual-spray piston cooling jets, a precision-machined oil scraper, enlarged oil sump and a contoured floor to allow oil to easily drain back to the sump. 

There are 49-state and race only versions available. 

S&S CYCLE INC.

www.sscycle.com