BMW's R series is built around the signature boxer (flat-twin) engine in a layout that dates to the original 1923 R32. The modern R models at Sun Coast span from air-cooled vintage airheads through oilhead, hexhead, and liquid-cooled wethead generations, each with fundamentally different parts compatibility. Every R-series component in our inventory was pulled from a donor bike at our Odessa, Florida facility, evaluated by a technician, and listed under its own SKU with free shipping.
BMW R Models platform overview
The boxer engine went through five major architecture changes that define parts interchange. The airhead era (pre-1996) covers the R75, R100, R65, and related models with air-cooled, pushrod-actuated two-valve engines. The oilhead generation (1993-2005) introduced oil-cooling, fuel injection, and a four-valve head on the R1100 and R1150 series. The hexhead (2004-2009) brought the R1200 series with SOHC and a counterbalance shaft. The camhead (2010-2013) moved to DOHC while remaining air/oil-cooled. The wethead (2013+) added liquid cooling and unit construction on the R1200 and later R1250 models. Parts do not cross between these engine generations even when displacement or model names overlap.
Within the oilhead family, the R1100GS, R1100R, R1100RS, and R1100RT share the same basic 1,085cc engine with different state of tune, but use model-specific frames, bodywork, and electronics. The same pattern holds for the R1150 series. In the hexhead and later generations, the R1200GS, R1200R, R1200RT, R1200RS, R1200S, and R1200ST share engine internals within a given sub-generation, but again with distinct frames and bodywork per model. The R1200 C and CL cruiser used the oilhead boxer in a cruiser chassis unrelated to any other R model. The R nineT, introduced in 2014, uses the camhead (air/oil-cooled DOHC) engine from the 2010-2013 R1200R, making it a useful parts donor for that generation. The R18 is a standalone platform with an 1,802cc air/oil-cooled boxer sharing nothing with any other current BMW.
Shop BMW R Models parts by model
Wethead / liquid-cooled (2013+):
Hexhead and camhead (2004-2013):
Oilhead (1993-2005):
Standalone platforms:
Vintage airhead:
Also see: BMW K Models Parts • BMW F Models Parts • BMW S Models Parts • BMW G Models Parts
Inspected by Powersports Technicians • Only One in Stock • Ships Fast from Florida
