Target Audience:
DIY mechanics, home repair enthusiasts, and professional technicians working on Yamaha TTR90 models.
Value Proposition:
Provides comprehensive technical data essential for maintaining and repairing the Yamaha TTR90, saving time and money on professional servicing.
Completeness:
Covers all aspects of the vehicle's operation, maintenance, and repair.
Accuracy:
Based on official Yamaha service documentation, ensuring accuracy and reliability.
Accessibility:
Digital format allows for easy access on various devices and convenient searching.
Engine System:
Complete engine disassembly, assembly, inspection, and repair procedures for all components.
Fuel System:
Carburetor service, cleaning, adjustment, fuel line inspection and replacement.
Ignition System:
CDI unit, spark plug, ignition timing, troubleshooting.
Transmission System:
Gearbox operation, clutch service, oil change, gear shift mechanism.
Chassis Frame:
Frame inspection, welding procedures (if applicable), component mounting.
Suspension System:
Front fork disassembly, service, and adjustment; rear shock absorber service.
Brake System:
Front and rear brake mechanism service, pad replacement, bleeding procedures.
Wheel Tire Hub:
Wheel bearing inspection and replacement, tire maintenance, spoke tensioning.
Electrical System:
Wiring diagrams, lighting system, battery maintenance, starter system, fuses.
Cooling System:
Air-cooled engine, focus on cylinder head fins and general airflow management.
Exhaust System:
Muffler and exhaust pipe inspection, maintenance, and potential repair.
Controls Cables:
Throttle cable, brake cables, clutch cable inspection, adjustment, and replacement.
Bodywork Trim:
Fairing removal, seat, fuel tank, and fender inspection and maintenance.
Routine Maintenance:
Detailed instructions for oil changes, filter replacements, chain adjustment, and general inspections.
Troubleshooting Diagnostics:
Systematic fault finding guides, common problem identification, and solutions.
Engine Overhaul:
Complete step-by-step procedures for engine teardown, rebuilding, and reassembly.
Carburetor Tuning:
Jetting information, idle speed adjustment, mixture screw settings.
Suspension Rebuild:
Fork oil replacement, seal replacement, shock absorber service.
Electrical Troubleshooting:
Using wiring diagrams to diagnose electrical faults.
Brake Bleeding:
Correct procedures for removing air from the brake lines.
Wheel Truing:
Information on maintaining wheel alignment and spoke tension.
Depth Level:
Complete Rebuild to Basic Maintenance
Diagnostic Capability:
Advanced diagnostic procedures for identifying and resolving complex issues.
Torque Specifications:
Detailed torque values for all critical fasteners.
Clearances Tolerances:
Specific measurements for valve clearances, piston ring gaps, and other critical tolerances.
Wiring Diagrams:
Detailed, legible wiring schematics for all electrical components.
Illustrations Diagrams:
High-quality exploded views and step-by-step diagrams.
Engine Type:
4-Stroke, SOHC
Engine Displacement:
88 cc (approx.)
Bore X Stroke:
Information available in the manual
Compression Ratio:
Information available in the manual
Cooling Method:
Forced Air Cooling
Cylinder Arrangement:
Single Cylinder
Horsepower:
Information available in the manual (typically around 8-10 HP for this class)
Torque:
Information available in the manual
Fuel Delivery:
Carburetor
Carburetor Model:
Mikuni VM Series (specific model details in manual)
Fuel Type:
Unleaded Gasoline
Oil Type:
Yamaha recommends SAE 10W-40 API SG or higher (refer to manual for precise specifications).
Oil Capacity:
Information available in the manual (typically around 0.9 - 1.0 liters)
Transmission Type:
Automatic (Centrifugal Clutch)
Gear Selection:
No traditional gearbox, automatic engagement.
Clutch Type:
Wet, Multi-disc, Centrifugal
Transmission Oil Type:
SAE 10W-30 API SE, SF, SG or SH (refer to manual for precise specifications).
Transmission Oil Capacity:
Information available in the manual (typically around 0.6 - 0.7 liters)
Overall Length:
Information available in the manual (approx. 1560 mm)
Overall Width:
Information available in the manual (approx. 700 mm)
Overall Height:
Information available in the manual (approx. 955 mm)
Seat Height:
Information available in the manual (approx. 670 mm)
Dry Weight:
Information available in the manual (approx. 70 kg)
Wet Weight:
Information available in the manual
Front Tire Size:
Information available in the manual (typically 2.50-10 4PR)
Rear Tire Size:
Information available in the manual (typically 3.00-10 4PR)
Wheelbase:
Information available in the manual (approx. 1090 mm)
Ground Clearance:
Information available in the manual (approx. 225 mm)
Engine Oil Change:
Every 1000 km or 6 months (refer to manual for exact intervals and conditions).
Spark Plug Check Replace:
Inspect every 1000 km, replace as needed. Specific plug type: NGK C6HSA or equivalent.
Air Filter Cleaning:
Clean every 500 km or as needed based on riding conditions. Replace as necessary.
Chain Lubrication Adjustment:
Lubricate every 300 km, adjust slack every 500 km.
Valve Clearance Check:
Check every 4000 km (refer to manual for specific settings and procedures).
Brake Fluid Type:
DOT 3 or DOT 4 brake fluid (refer to manual for specific type).
Common Wear Items:
Brake shoes, spark plugs, air filters, clutch springs, chain and sprockets are common wear items on this model.
Carburetor Cleaning Frequency:
Carburetors can become fouled with debris or gum over time, requiring periodic cleaning and adjustment, especially if the bike sits for extended periods.
Electrical Connections:
Corrosion on electrical connectors can lead to intermittent faults, requiring inspection and cleaning.
