2017 Harley-Davidson Fat Boy S. We went out to check the pulse of the street and then into the garage. The Fat Boy® S rolled out. Raw custom attitude with the most powerful engine you can get in a cruiser this year… Power Blackout. The Fat Boy® S model gives you modern power in a blacked-out classic. The gloss black Screamin’ Eagle® Air-Cooled Twin Cam 110B™ engine is complimented by blacked out styling details wheel to wheel. You get gloss black lower forks, axle nut covers, handlebar and riser; black brake lever and hydraulic clutch assembly; and black over/under shotgun exhaust with slash cut mufflers. Take a ride on 110 cubic inches of dark style. Harley-Davidson doubles down on emotional appeal and performance with the new Softail® Fat Boy® S model. We’ve taken the winning relevance of the Fat Boy® motorcycle and made it work harder by giving it an engine upgrade and a new dark design.