This manual provides comprehensive service and repair information for motorcycles, including the C90, S90, CL90, CD90, and CT90 models. These motorcycles, descendants of the iconic Super Cub, are celebrated for their reliability, fuel efficiency, and versatility, spanning various styles from street commuters to trail-ready machines. Primarily produced from the 1960s through the 1980s, these models represent a significant part of heritage in creating accessible and enduring two-wheeled transportation. Their robust engineering and straightforward mechanical design have made them popular for daily use, restoration projects, and as reliable vintage machines.
The purpose of this digital repair manual is to equip owners, mechanics, and technicians with the detailed knowledge required for the maintenance, repair, and restoration of these motorcycles. It covers a wide array of systems, including in-depth engine service, fuel system operation, gearbox and transmission maintenance, clutch procedures, suspension and brake servicing, and electrical system diagnostics. The manual includes factory repair procedures, fault-finding guides, rebuilding instructions, and essential technical specifications, all supported by abundant illustrations and diagrams to ensure clarity and accuracy in every task.
Model:
C90, S90, CL90, CD90, CT90
Product Type:
Service and Repair Manual
Model Codes Covered:
C90, S90, CL90, CD90, CT90
Target Audience:
Honda C90, S90, CL90, CD90, CT90 owners, DIY mechanics, restoration enthusiasts
Manual Value:
Provides dealer-level diagnostic and repair information, saving on professional labor costs.
Content Scope:
Comprehensive coverage from routine maintenance to in-depth engine and gearbox rebuilding.
Resource Type:
Professional quality, detailed service repair manual.
Systems Covered:
Engine Service, Fuel System, Gearbox, Exhaust System, Suspension, Bodywork, Cooling System, Electrics, Brake Servicing, Transmission, Driveshaft, Timing Chain, Clutch, Front Suspension
Procedures Included:
Repair, Maintenance, Rebuilding, Refurbishing, Restoration, Fault Finding, Clutch Removal and Installation, Gearbox Service, Suspension Service, Brake Procedures, Engine Firing Order
Estimated Page Count:
Detailed and comprehensive, exact count not specified but implied to be extensive for full coverage.
Manual Type:
Factory Service Manual / Digital Repair Manual
Language:
English (assumed based on product description phrasing)
Format:
Digital Download (PDF)
Engine:
Complete Engine Service, Engine Firing Order, Timing Chain Service
Fuel System:
Fuel System Service
Transmission Drivetrain:
Gearbox, Transmission, Driveshaft, Clutch Removal and Installation
Suspension Steering:
Suspension, Front Suspension
Brakes:
Brake Servicing Procedures
Electrical:
Wiring Diagrams, Electrics
Cooling System:
Cooling System
Maintenance:
Factory Maintenance Schedules
Diagnostics:
Fault Finding
Rebuilding:
Rebuilding the machine (engine, gearbox implied)
Depth:
Comprehensive (from wiring to rebuilding the machine), Factory Repair Procedures, Detailed Specifications
Illustrations:
Abundant Illustrations, Lots of Pictures & Diagrams
Searchability:
Searchable Text (typical for well-produced PDF manuals)
Print Readability:
High Quality (implied for dealer-level information)
Binding:
N/A (Digital Format)
Paper Quality:
N/A (Digital Format)
Engine Type:
Likely Air-Cooled, 4-Stroke Single-Cylinder (typical for these models)
Displacement Range:
Likely in the 50cc to 105cc range across the various models (e.g., C90 typically 90cc, S90/CL90/CD90 around 90cc, CT90 around 90-105cc). Exact displacement will be model-specific within the manual.
Horsepower Range:
Estimated 6-9 HP (typical for this class of engine, specific figures in manual)
Torque Range:
Estimated 5-7 lb-ft (typical for this class of engine, specific figures in manual)
Carburetion:
Likely Keihin or similar carburetor, specific model and size detailed in manual.
Fuel Type:
Unleaded Gasoline (specific octane rating in manual)
Ignition Type:
CDI (Capacitor Discharge Ignition) or breaker points ignition, depending on model year and variant. Detailed in manual.
Oil Type:
Motorcycle-specific 4-stroke engine oil (e.g., SAE 10W-30, SAE 20W-40). Specific API classification and viscosity grade will be in the manual.
Valve Train:
Overhead Valve (OHV) or Single Overhead Cam (SOHC), depending on specific model. Timing chain or belt details provided.
Transmission Type:
Likely 3-speed, 4-speed, or 5-speed manual transmission, with some models featuring a dual-range gearbox (e.g., CT90). Specifics per model in manual.
Clutch Type:
Wet, multi-plate clutch. Details on removal, installation, and servicing.
Gear Ratios:
Specific gear ratios for each model and transmission variant will be detailed in the manual.
Transmission Oil Type:
Typically SAE 80 or 90 hypoid gear oil, or sometimes the same engine oil as used in the crankcase. Specifics provided in the manual.
Vehicle Type:
Motorcycles (various styles including street, scrambler, trail)
Dry Weight Range:
Approximately 70-100 kg (155-220 lbs), varying by model. Specific weight figures in manual.
Safety Standards:
Adherence to period safety standards of the manufacturing era. Manual will cover brake system maintenance for optimal safety.
Braking System:
Drum brakes (front and rear) typically. Manual details adjustment, pad replacement, and fluid checks if applicable.
Lighting Electrical:
Wiring diagrams for headlights, taillights, turn signals, and other electrical safety components.
Infotainment Systems:
N/A (These are classic motorcycles with mechanical systems, no digital infotainment).
Assistance Features:
N/A (Basic mechanical controls).
Connectivity Options:
N/A (No electronic connectivity features).
Oil Change Interval:
Typically every 1,000-2,000 miles or 6 months, whichever comes first. Manual will provide exact intervals.
Spark Plug Replacement:
Intervals will vary, but generally between 3,000-6,000 miles. Manual provides specific recommendations and gap settings.
Valve Adjustment:
Recommended at intervals like 3,000-5,000 miles. Manual provides procedure and specifications.
Brake Fluid:
If hydraulic brakes are present (unlikely for most drum brake systems on these models, but manual will clarify), typically DOT 3 or DOT 4. Manual will specify if applicable.
Fuel Type:
Unleaded gasoline. Octane rating and ethanol content recommendations will be in the manual.
Common Wear Items:
Carburetor cleaning/rebuilding due to age, electrical connectors and wiring degradation, wear on clutch plates, suspension component wear (shocks, bushings).
Engine Seals:
Oil seal deterioration leading to leaks. Manual covers seal replacement procedures.
Honda Motorcycles:
Honda is a renowned global manufacturer with a rich history in producing reliable and innovative motorcycles across a wide range of segments.
Honda Cub Lineage:
The C90, CD90, CT90, and related models are descendants of the iconic Honda Super Cub, known for its durability, fuel efficiency, and ease of use, adapted for various purposes from urban commuting to off-road adventure (CT models).
Production Era:
These models were primarily produced from the 1960s through the 1980s. Specific years covered by the manual are crucial and should be confirmed, but likely spans a significant portion of this period.
Honda Super Cub Legacy:
While specific awards for C90/S90/CL90/CD90/CT90 models may not be widely publicized, they are part of the highly successful and globally recognized Honda Super Cub lineage, celebrated for reliability and pioneering design.
