🏷️ Basic Information

Make:

BMW

Model:

R100

Year:

1990

👋 Introduction

Target Audience:

Owners of BMW R100 series motorcycles from 1990 seeking to perform their own maintenance, repairs, and diagnostics.

Value Proposition:

Provides essential technical information and procedural guidance that can significantly reduce repair costs and ensure the longevity and optimal performance of the iconic BMW R100.

Accessibility:

Downloadable format ensures immediate access for urgent repairs or scheduled maintenance.

📋 Manual Details

Manual Type:

Service and Repair Manual

Language:

English

Format:

Downloadable

📖 Manual Coverage

Engine Overhaul:

Complete engine disassembly, inspection, and reassembly procedures for the BMW R100 boxer twin engine.

Fuel System:

Detailed diagnosis and repair of carburetors (Bing 32mm recommended), fuel lines, fuel pump, and fuel tank.

Ignition System:

Troubleshooting and repair of ignition coils, spark plugs, points and condenser (or electronic ignition system), and wiring.

Transmission And Drivetrain:

Service procedures for the 5-speed gearbox, clutch assembly, driveshaft, and final drive unit.

Braking System:

Inspection, repair, and bleeding procedures for front and rear disc brakes, including master cylinder and caliper service.

Suspension And Steering:

Front fork (telescopic) and rear swingarm suspension maintenance, including fork seal replacement and shock absorber service. Steering head bearing adjustment and replacement.

Electrical System:

Comprehensive wiring diagrams, troubleshooting guides for lighting, charging system (alternator/generator), starter motor, and instrumentation.

Frame And Bodywork:

Procedures for chassis inspection, fairing removal and installation (if applicable), and minor bodywork adjustments.

Routine Maintenance:

Oil changes, filter replacements, spark plug checks, chain lubrication and adjustment (if applicable to specific R100 variants), brake pad inspection, and general lubrication.

Troubleshooting Guides:

Step-by-step diagnostic procedures for common starting issues, running problems, electrical faults, and performance issues.

Component Rebuilds:

Detailed instructions for rebuilding carburetors, brake calipers, master cylinders, and the transmission.

Technical Specifications:

Torque values, clearances, fluid capacities, and electrical resistance readings.

Carburetor Rebuild:

Complete step-by-step guide to disassembling, cleaning, inspecting, and reassembling BMW R100 Bing carburetors, including jetting and tuning.

Clutch Adjustment And Replacement:

Detailed instructions for adjusting clutch cable tension and replacing clutch plates and springs.

Wheel Bearing Service:

Procedures for checking, repacking, and replacing wheel bearings on both front and rear wheels.

Battery And Charging System Testing:

Guides for testing battery health, alternator output, and voltage regulator functionality.

Tire And Tube Replacement:

Instructions for safe and proper tire and inner tube replacement, including mounting and balancing.

Headlight And Taillight Replacement:

Simple procedures for bulb replacement and fixture servicing.

Exhaust System Maintenance:

Instructions for exhaust pipe removal, gasket replacement, and muffler servicing.

Depth:

Comprehensive, from basic maintenance to complete engine and transmission overhauls. Suitable for both novice DIY mechanics and experienced technicians.

Wiring Diagrams:

Includes comprehensive, often color-coded, wiring diagrams for all electrical systems.

Diagnostic Charts:

Troubleshooting flowcharts and symptom-to-cause diagnostic tables.

Special Tool Identification:

Highlights necessary special tools for specific tasks, aiding in preparation.

📊 Manual Specifications

Digital Format:

PDF (Searchable and Printable)

Resolution:

High-resolution images and diagrams suitable for clear viewing and printing.

Digital Delivery:

Instant download link provided post-purchase.

N A:

Not applicable for digital format.

⚙️ Engine Specifications

Engine Type:

Air-cooled, four-stroke, horizontally opposed twin-cylinder (Boxer)

Displacement:

980 cc (approx. 59.8 cubic inches)

Bore X Stroke:

94 mm x 70.6 mm (approx. 3.70 x 2.78 inches)

Compression Ratio:

8.5:1 (typical, may vary slightly)

Valve Train:

Overhead camshaft (OHC) driven by the crankshaft via pushrods and rocker arms. Mechanical valve lash adjustment.

Cooling System:

Air cooling.

Lubrication System:

Wet sump lubrication with oil filter.

Horsepower:

Approx. 65-70 HP @ 7000 RPM (varies by specific R100 model variant)

Torque:

Approx. 75 Nm (55 lb-ft) @ 5000 RPM (varies by specific R100 model variant)

Carburetor Type:

Dual Bing constant velocity carburetors (typically 32mm).

Fuel Grade:

Unleaded gasoline, minimum 91 RON (87 AKI)

🔧 Transmission

Transmission Type:

5-speed constant mesh manual gearbox

Clutch Type:

Single dry plate, diaphragm spring

Final Drive:

Shaft drive

Gear Ratios:

Specific gear ratios provided in manual, crucial for performance tuning and diagnostics.

Gearbox Oil:

Manual specifies SAE 80W-90 gear oil (e.g., BMW recommends Castrol EPX 80W-90 or equivalent).

📐 Dimensions

Wheelbase:

Approx. 1465 mm (57.7 inches) (varies by model)

Seat Height:

Approx. 780-830 mm (30.7-32.7 inches) depending on seat and suspension.

Fuel Tank Capacity:

Typically 20 liters (5.3 gallons), with a reserve.

Dry Weight:

Approx. 208 kg (458 lbs) (varies by model)

Gross Vehicle Weight:

Typically around 400 kg (880 lbs)

🛡️ Safety Features

N A:

Motorcycles of this era do not typically have standardized crash test ratings like automobiles.

Braking System:

Dual front disc brakes and a single rear disc brake. Early models might have drum brakes on the rear.

Frame Construction:

Steel tubular frame providing structural integrity.

💡 Technology Features

N A:

No integrated infotainment systems typical of modern vehicles. Focus is on mechanical and electrical functionality.

N A:

No electronic driver assistance features.

N A:

No modern connectivity features.

🔧 Maintenance

Oil Change:

Every 5,000 - 10,000 km (3,000 - 6,000 miles) or annually, depending on usage. Engine oil and filter change.

Valve Adjustment:

Every 10,000 - 20,000 km (6,000 - 12,000 miles). Crucial for Boxer engines.

Spark Plug Replacement:

Every 10,000 - 20,000 km (6,000 - 12,000 miles) or as per manual recommendation.

Engine Oil:

20W-50 or 10W-40 motorcycle specific oil (check manual for precise recommendations).

Brake Fluid:

DOT 3 or DOT 4 (check manual for specific caliper requirements).

Final Drive Oil:

SAE 80W-90 Gear Oil (e.g., Castrol EPX 80W-90 or equivalent)

Oil Leaks:

Common at cylinder base gaskets, pushrod seals, and output shaft seals due to age and heat cycles. Manual provides detailed replacement procedures.

Electrical Connector Corrosion:

Can lead to intermittent electrical issues. Manual guides on inspection and cleaning.

Carburetor Sync And Idle Stability:

Requires periodic synchronization and adjustment. Manual offers detailed steps.

Final Drive Spline Lubrication:

Requires periodic lubrication of the driveshaft and final drive splines to prevent wear. Manual details the process.

Steering Head Bearings:

Can develop notching or looseness over time, requiring adjustment or replacement. Manual provides torque specifications for adjustment.

📚 Vehicle History

Bmw Motorrad:

BMW Motorrad has a long and storied history dating back to the 1920s, known for engineering excellence and reliable motorcycles.

R Series Legacy:

The R100 is part of the iconic R series boxer twin lineup, which has been a cornerstone of BMW's motorcycle production for decades, evolving through various displacements and configurations.

R100 Variants:

Encompasses models like R100RT, R100RS, R100GS, R100R, R100CS, R100T, and the R100GS Paris-Dakar, all sharing the core boxer engine and drivetrain.

Manufacturing Location:

Germany

🏆 Awards & Recognition

N A:

BMW motorcycles of this era are renowned for their build quality and touring capability, often earning accolades from motorcycle journalists and owners for their reliability and character rather than formal awards.