1955-1966 BMW R26 / R27 Repair Manual

BMW R26 and R27 Technical Documentation

• Covers 1955–1966 BMW R26 and R27 motorcycles, documenting engine, chassis, transmission, and electrical systems in detail
• Official BMW publication P/N 9099 136, July 1962 printing
• Contains 153 detailed technical figures, diagrams, and exploded-view illustrations for components
• File link appears in your order confirmation straight away
• Laid out for standard letter and A4 printing
• This 1962 edition documents the transition and servicing requirements for both the single-cylinder R26 and the higher-performance R27 build

Component and System Coverage

This factory manual provides an expert overview of the assembly, adjustment, and maintenance for the BMW R26 and R27 series. The document details the internal workings of the 4-stroke single-cylinder engine, including valve timing, piston and cylinder clearances, and crankshaft installation. Beyond the engine, how factory workshop documentation is structured includes guidance for the 4-speed transmission, foot-operated gear change mechanism, and the rear-axle drive assembly. The manual focuses on structural integrity, covering frame alignment, swing-arm suspension setup, and sidecar configuration specifics for both models.

Specification and Reference Data

Technical depth is provided through comprehensive tables documenting tightening specifications, fluid capacities, and electrical reference values. The documentation lists specific torque settings for cylinder head bolts at 25 ft-lbs and flywheel retaining screws at 123 ft-lbs. Intake valve clearance is specified at 0.15 mm (0.006") while exhaust valve clearance is set at 0.20 mm (0.008") for both models in engine-cold conditions. The manual includes dedicated sections for Bosch electrical components, specifying spark plug gaps and ignition timing metrics for precise engine tuning. All service data shown here is for reference only — qualified technicians and the original OEM documentation remain the authoritative source for any hands-on work. An official BMW factory publication covering the 1955–1966 R26 and R27 motorcycles, documenting engine, chassis, electrical, and drive-train specifications for these classic single-cylinder German machines.