Editing Straight-twin engine (section)

=== Main bearings ===
Each cylinder in a straight-twin engine has a separate [[crankpin]], unlike V-twin engines which can use a common crankpin for both [[connecting rod]]s. Most vintage British straight-twin motorcycle engines (such as Triumph, BSA, Norton and Royal Enfield) had two [[main bearing]]s.<ref name="BargerRide" /> Beginning in the late 1950s, most Honda straight-twin engines had four main bearings.<ref name="EveryHonda" /><ref name="FrankHonda" /> Subsequent straight-twin engines had four or occasionally three main bearings.<ref name="balls" />