The BMW Boxer Twins Bible: All Air-cooled Models 1970-1996 (Except R45, R65, G/S & GS)
Before the /5 series, BMW had a reputation for producing expensive and idiosyncratic touring motorcycles. But the /5 changed that. Although still expensive, the market was opened to a new world of riders, and during the 1970s the air-cooled boxer evolved into the ground-breaking R90S and R100RS. These were among the first motorcycles with factory-fitted fairings and they also offered class-leading performance. Even when BMW decided to discontinue the twins in favor of the new four-cylinder K-series in 1984, demand for the older boxers forced BMW to reconsider. The boxer was resurrected and continued for more than a decade.
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2mm valve clearance aluminium AMA Superbike Beru bikes BMW motorcycle BMW’s Bosch boxer twin Brembo camshaft carburetor Main jet carburetor Right carburetor carburettors chassis closing Exhaust opening clutch Compression ratio crankcase crankshaft cylinder head Daytona disc brake drive Overall width driveshaft drum brake engine Fifith gear Final Final drive Overall fork legs Frame numbers front brake front fork fuel tank gap First gear gear Final drive gear Fourth gear gear Second gear gear Third gear gearbox handlebar head light horsepower Horsepower Left carburetor Idle jet Sparkplugs Intake closing Exhaust intake opening Intake jet Jet needle jet Needle jet K-series Main jet Needle Metallic mudguard Needle jet Jet Nivomat opening Intake closing Overall length Wheelbase Overall width Seat pinstripes piston Pridmore production pushrod R100RT Mono R1OOCS R1OORS racing rear Right carburetor Main shock absorber Superbike Superbike race swingarm Third gear Fourth updates Valve timing 2mm Wheelbase Weight including width Seat height