Market Segment:
Urban mobility scooter/maxi-scooter (unique safety features)
Key Differentiators:
Integrated roll-cage safety cell, car-like steering wheel and seat, innovative safety design for its time.
Vehicle Concept:
Designed as a safer alternative to traditional scooters, offering enhanced crash protection and weather protection.
Manual Purpose:
To provide BMW-certified or competent technicians with the necessary information to diagnose, maintain, and repair the C1 models.
Engine Systems:
Engine mechanical (cylinder, piston, crankshaft, valve train), Fuel system (carburetor, fuel pump), Ignition system, Lubrication system, Cooling system (air-cooled), Exhaust system
Transmission Drivetrain Systems:
Automatic transmission (CVT), Clutch, Final drive (belt/chain drive)
Chassis Frame Systems:
Frame construction, Suspension (front telescopic fork, rear shock absorber), Steering system, Wheels, Tires
Braking Systems:
Front brake (disc), Rear brake (disc), Braking system hydraulics
Electrical Systems:
Battery, Charging system (alternator/stator), Lighting system (headlight, taillight, indicators), Ignition switch, Wiring diagrams, Electrical components
Bodywork And Fairings:
Body panels, Fairings, Seat, Handlebars, Controls, Roll-cage structure
Routine Maintenance:
Oil change, Filter replacement, Spark plug inspection/replacement, Chain/belt adjustment, Brake pad inspection/replacement, Tire pressure checks, General lubrication
Troubleshooting:
Diagnostic procedures for common faults, Fault code interpretation (if applicable), Symptom-based troubleshooting guides
Repair And Overhaul:
Engine disassembly and reassembly, Transmission servicing, Brake system overhaul, Suspension component replacement, Electrical system repair
Technical Specifications:
Torque specifications for fasteners, Clearance measurements, Engine timing, Fluid capacities, Electrical resistance values
Special Tools:
The manual will list any specialized tools required for specific repair or diagnostic procedures, such as engine timing tools, clutch compressors, or electrical testers.
Assembly Disassembly Instructions:
Step-by-step instructions with diagrams for all major components and systems, ensuring correct reassembly.
Depth Of Coverage:
Comprehensive (covers from basic maintenance to detailed repair and overhaul, intended for professional mechanics)
Wiring Diagrams:
Detailed electrical schematics for all systems, including component identification and wire routing.
Engine Type:
Four-stroke, single-cylinder, liquid-cooled (for 200cc, may vary slightly for 125cc with air-cooling potential)
Displacement:
125 cc (approximate for C1-125), 176 cc (for C1-200)
Bore X Stroke:
Varies by specific engine variant (detailed in manual)
Compression Ratio:
Varies by specific engine variant (detailed in manual)
Horsepower:
Approx. 15 hp (for C1-125), Approx. 18-20 hp (for C1-200) - specific figures in manual
Torque:
Varies by specific engine variant (detailed in manual)
Fuel Delivery:
Carburetor (likely Keihin or similar, specific model in manual)
Fuel Type:
Unleaded Gasoline
Ignition Type:
Electronic Ignition (CDI or TCI)
Oil Type:
SAE 10W-40 or similar motorcycle-specific engine oil (exact spec and capacity in manual)
Cooling Method:
Liquid-cooled (for 200cc), potentially air-cooled for some 125cc variants (details in manual)
Engine Type:
Four-stroke, single-cylinder, liquid-cooled.
Displacement:
176 cc (for C1-200).
Length:
Approx. 2,200 mm (specifics in manual)
Width:
Approx. 780 mm (specifics in manual)
Height:
Approx. 1,500 mm (specifics in manual)
Dry Weight:
Approx. 150-160 kg (specifics in manual)
Gross Vehicle Weight:
Varies (detailed in manual)
Cargo Capacity:
Integrated storage compartment behind seat (specific volume in manual)
Crash Safety Design:
Integral safety cell (roll cage) inspired by automotive safety standards.
Braking System Type:
Front disc brake, Rear disc brake with integrated parking brake mechanism (details on ABS availability in manual if applicable)
Occupant Restraint:
Seatbelt (3-point or similar) integrated into the seat and roll-cage structure.
Visibility:
Integrated windshield, windscreen wipers (optional/specific models), automotive-style headlights and taillights.
Audio System:
Optional accessory audio systems may have been available, but not standard for all models. Manual covers basic electrical system for integration.
Safety Systems:
Integrated safety cell, crumple zones in fairing, advanced braking systems for the era, seatbelt.
Diagnostic Ports:
Likely proprietary BMW diagnostic connector or a standard interface for engine management diagnostics (details in manual).
Engine Oil Change:
Every 5,000 km or 1 year (typical, refer to manual for exact interval and oil type)
Air Filter Replacement:
Every 10,000 km or as needed based on conditions (detailed inspection/cleaning/replacement in manual)
Spark Plug Replacement:
Every 10,000 - 15,000 km (specific plug type and gap in manual)
Brake Fluid Replacement:
Every 2 years (DOT 4 or equivalent, specific type and capacity in manual)
Engine Oil Specification:
BMW recommends specific viscosity grades like SAE 10W-40, meeting API SJ or higher standards. Refer to manual for exact BMW specification number.
Coolant Type:
For liquid-cooled models: BMW Antifreeze/Coolant or equivalent with appropriate corrosion inhibitors. Specific mix ratio (e.g., 50/50) in manual.
Brake Fluid Specification:
DOT 4 (or DOT 3 if specified for earlier variants). Ensure compliance with BMW standards.
Transmission Oil Specification:
Specific automatic transmission fluid (ATF) type and capacity, likely a proprietary BMW spec or a widely recognized equivalent. Details in manual.
Common Wear Items:
Brake pads, tires, drive belt (CVT), battery, spark plugs, suspension bushings.
Potential Electrical Gremlins:
As with many vehicles of this era, electrical connections and grounds can be a source of intermittent issues. The manual will detail diagnostic procedures.