BMW flat twin boxer engine identification

Air head
Until 1994.
Air cooled, 2 valves.
Up to 1000cc.
/2, /3 Series.
/3, /4, /5, /6 Series.
/7 Series.
Some late models are delivered with the "round" valve covers of the /6 Series.
Oil head
Air and oil cooled, 4 valves.
1993.
R1100 / R850 Series (1085cc / 848cc).
Spark cover with text "4VALVE".
1999.
R1150 / R850 Series (1130cc / 848cc).
Full length spark cover.
2003.
R1150 / R850 Series (1130cc / 848cc) Twin spark.
Half-long, spoon-shaped spark cover.
Chrome head
1997-2004.
R1200C Series (1170cc) Oilhead.
Chrome valve cover.
Hex head
2004.
R1200 Series (1170cc) Oilhead.
Hex shape head with four bolts and horizontal snake-head spark cover.
Cam head
2010.
R1200 Series (1170cc, 81 kW, Euro 3) Oilhead.
Dual Over Head Camshaft (DOHC).
Two bolts and vertical spark cover.
2021.
R-NineT-MY2021 (1170cc, 80 kW, Euro 5) Oilhead.
Dual Over Head Camshaft (DOHC).
Horizontal spark cover toward the rear.
Waterhead or Wethead or LC
Air and liquid cooled (LC).
2014.
R1200 Series (1170cc).
Horizontal spark cover toward the front.
The cylinder is rotated 90 degrees with the inlet on top and the exhaust at the bottom.
2018.
R1250 Series (1254cc).
Variable Camshaft control system.
Boomerang shape spark cover with text "SHIFT CAM".
Big Boxer
Air and liquid cooled.
2020.
R18 Series (1802cc).

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