All modern Sportsters come with Harley-Davidson's Evolution V-twin engine, which has been bored to either 883cc (54 cubic inches) or 1200cc (74 cubic inches).
The 883 engines are easily upgraded to the 1200, since the stroke is identical, by the addition of new pistons and jugs (or by just boring out the 883 cylinders), and by slightly modifying the 883 heads.
The kit that Harley-Davidson sells to change an 883 into a 1200 will set you back around $900, which should include installation by your local Harley-Davidson dealer.
While either engine size gives you easy control of instant torque for real world riding situations, the 1200 is especially popular because of the nice upgrade in power you get over the 883.
Use the drop-down menu below to sort through the used Harley Sportsters with the 1200 engine on sale right now:
