Model:
CT90 Trail / CT110 Trail
Model Variant:
CT90 Trail (Scrambler), CT110 Trail (Postie Bike)
Product Type:
Service Repair Manual
Vehicle Chassis Codes:
CT90 (various K models), CT110 (various K models)
Engine Codes:
CT90 (approx. 89cc OHC single-cylinder), CT110 (approx. 105cc OHC single-cylinder)
Target Audience:
Honda CT90 and CT110 owners, mechanics, restorers, and enthusiasts.
Value Proposition:
Provides professional-grade repair and maintenance information that can save money on labor costs and ensure proper upkeep of the vehicles.
Content Highlight:
Includes detailed procedures, wiring diagrams, and specifications crucial for effective maintenance and repair of these iconic dual-sport motorcycles.
Years Covered:
1977, 1978, 1979, 1980, 1981, 1982
Estimated Page Count:
Highly detailed, comprehensive coverage implies significant page count (exact number not specified in product info, but typical for full service manuals).
Type:
Service Repair Manual
Engine:
Complete Engine Service, Engine Firing Order, Timing Chain Service
Fuel System:
Fuel System Service, Carburetor Service
Transmission Drivetrain:
Gearbox, Gearbox Service, Removal and Installation, Driveshaft (if applicable for specific models/variants, though typically shaft drive on these models is less common than chain drive)
Clutch:
Clutch Removal and Installation
Brakes:
Brake Servicing Procedures
Suspension:
Suspension, Front Suspension
Electrical:
Wiring Diagrams, Electrics
Exhaust:
Exhaust System, Exhaust Service
Cooling System:
Cooling System (primarily air-cooled, but may cover oil cooling if applicable to certain variants)
Maintenance:
Factory Maintenance Schedules, General Maintenance
Repair:
Factory Repair Procedures, Rebuilding the Machine, Complete Engine Service
Diagnostics:
Fault Finding, Troubleshooting
Installation:
Clutch Removal and Installation, Gearbox Removal and Installation
Rebuild Guide:
The manual explicitly states 'rebuilding the machine', indicating it covers complete engine and component overhauls.
Depth:
Comprehensive (from wiring to rebuilding), Dealer-level information
Diagnostics Capability:
Includes troubleshooting guides for common problems, aiding in the identification and resolution of mechanical and electrical faults.
Visuals:
Abundant Illustrations, Lots of Pictures & Diagrams
Format:
Digital (likely PDF)
Quality:
Professional Quality (implied by dealer-level content)
Binding:
N/A (Digital Format)
Paper Type:
N/A (Digital Format)
Specific Procedures List:
Engine overhaul, carburetor tuning, ignition system troubleshooting, brake system maintenance, suspension adjustment, electrical system diagnostics, clutch plate replacement, gearbox lubrication and inspection, exhaust system repair.
Type:
4-stroke, OHC, Single Cylinder
Displacement Ct90:
Approximately 89cc
Displacement Ct110:
Approximately 105cc
Horsepower Ct90 Approx:
Around 8-10 HP (exact figures vary by specific model K number)
Horsepower Ct110 Approx:
Around 9-11 HP (exact figures vary by specific model K number)
Carburetion:
Keihin Carburetor (specific model varies by year and market, e.g., PB18 for some models)
Fuel Type:
Unleaded Gasoline
Carburetor Service Details:
Detailed disassembly, cleaning, inspection, and reassembly procedures for the carburetor, including jetting and float bowl adjustment.
Timing Chain Service:
Detailed procedures for timing chain inspection and replacement.
Type:
Semi-automatic (Clutchless) or Manual Transmission
Gear Configuration Ct90:
Typically 4-speed with Hi/Lo range (often 2 speeds in transmission, multiplied by range selector)
Gear Configuration Ct110:
Typically 4-speed with Hi/Lo range (often 2 speeds in transmission, multiplied by range selector)
Clutch Operation:
Centrifugal automatic clutch (for semi-automatic models)
Oil Change:
Typically every 1,000-2,000 miles or annually, refer to manual for specific intervals.
Valve Adjustment:
Recommended every 2,000-4,000 miles, or as per manual's 'check' interval.
Spark Plug Replacement:
Typically every 5,000-10,000 miles, or as per manual's recommendation.
Engine Oil Type:
SAE 10W-30 or 20W-40 API SE or SF service classification (refer to manual for precise recommendation).
Engine Oil Capacity:
Approximately 1.0-1.2 Liters (refer to manual for exact capacity).
Gearbox Oil Type:
Hypoid gear oil or specific transmission oil as recommended by Honda (often separate from engine oil).
Carburetor Fouling:
Common with older carbureted engines; requires periodic cleaning and adjustment, especially if fuel is left in the system for extended periods.
Electrical Connections:
Corrosion or looseness in wiring connectors can lead to intermittent electrical issues.
Clutch Wear:
Centrifugal clutch components can wear over time and require replacement.
Exhaust Leaks:
Gasket leaks at the cylinder head or muffler connections are possible.
Honda Motorcycles:
Honda has a long-standing reputation for reliable and innovative motorcycles, including iconic dual-sport models.
Ct Series:
The CT series, including the CT90 and CT110, evolved from earlier Honda trail bikes, becoming immensely popular for their durability and versatility in various terrains and applications (e.g., farming, postal services).
Production Period:
The CT90 was produced from the late 1960s through the early 1980s. The CT110 replaced it in many markets and was produced through the 1980s and beyond.
