DOHC boxers

The R Series range of flat-twin models was also updated in 2004, beginning with the BMW R 1200 GS dual-sport, which was powered by a new 1,170 cc (71 cu in) "oilhead" engine. This was followed by the 2005 BMW R 1200 ST sport-tourer, the 2005 BMW R 1200 RT tourer, the 2006 BMW R 1200 S sport-tourer, and the 2006 BMW R 1200 R naked bike. In 2014, the redesigned BMW R1200 RT used a water-cooled engine and a wet clutch. The BMW HP2 Enduro dirt bike was introduced in 2005, based on the BMW R 1200 GS. In 2007, the HP2 Enduro was joined by the road-biased HP2 Megamoto fitted with smaller alloy wheels and street tyres.