BMW 247 engine

With minor and more significant updates (247/76 in 1976 and 247/M80 in 1981) it was used by BMW beginning with the 1974 /6 series in its motorcycles from 1974 to 1995.

From 1981, introduced in the R80G/S it used electronic ignition, Nikasil cylinders, and a lighter flywheel.

[1] A number of different models were on the market: Subsequent to the type 247 motor, BMW also built other air-cooled flat twin engines known as the Typ 248/1 used for the R45, the R65 and the R65LS BMW motorcycles.

Before that they built side-valve and OHV engines commencing with the R32 of 1923.

After the type 247, BMW substantially changed the engine design to include partial oil cooling and four valves per cylinder, a design which was to become known as the "oilhead".