Segment:
Entry-level off-road motorcycle, popular for youth riders and recreational trail riding.
Competitors:
Honda CRF70F, Kawasaki KLX110, Suzuki JR80.
Features:
Compact size, lightweight, user-friendly operation, electric start (on some models/years, likely on the TTR90), reliable 4-stroke engine, suitable for novice riders.
Coverage:
Complete Repair and Maintenance Information
Diagnostic Charts:
Troubleshooting guides organized by symptom to help identify and resolve common problems efficiently.
Pages:
Extensive (Exact number not specified, but described as 'complete')
Type:
Service Manual / Repair Manual
Format:
Digital Download (PDF)
Quality:
High-resolution PDF for clear viewing and printing. Searchable text capabilities are typically included in professional PDFs.
Printability:
Designed for easy printing of specific sections or the entire manual.
Binding:
N/A (Digital PDF)
Engine:
Top-end overhaul, bottom-end overhaul, lubrication, cooling, fuel system, exhaust system, ignition system, starting system, electrics.
Transmission:
Clutch operation, gear shifting mechanism, transmission disassembly and reassembly, lubrication.
Chassis:
Frame, suspension (front and rear), steering system, wheels, tires, brakes (front and rear).
Electrical:
Wiring diagrams, lighting system, ignition coil, stator, battery, charging system.
Maintenance:
Routine checks, oil changes, filter replacements, chain adjustment, spark plug maintenance, valve clearance adjustment.
Troubleshooting:
Diagnostic procedures for common issues, fault finding charts, solutions for starting problems, running issues, and electrical faults.
Repair:
Detailed step-by-step instructions for component removal, disassembly, inspection, repair, reassembly, and installation.
Rebuilding:
Comprehensive guidance for engine rebuilding, transmission overhauls, and other major component repairs.
Suspension Tuning:
Information on adjusting suspension sag and damping characteristics for rider weight and terrain.
Wheel And Tire Service:
Instructions for wheel removal, spoke tensioning, tire mounting and balancing, and tube replacement.
Depth:
Detailed diagnostic procedures, torque specifications for all fasteners, clearance measurements, and wear limits.
Diagnostic Tools:
Manual details standard diagnostic procedures using basic tools, no specialized electronic diagnostic equipment is required for this model.
Torque Specifications:
Includes precise torque values for critical fasteners, such as engine mounting bolts, cylinder head bolts, and suspension components.
Engine Type:
Air-cooled, 4-stroke, SOHC
Displacement:
88 cc (Cubic Centimeters)
Bore X Stroke:
Approx. 50 mm x 45.6 mm
Cooling System:
Air Cooling
Ignition System:
CDI (Capacitor Discharge Ignition)
Starting System:
Kick Starter and Electric Start (if equipped, manual will cover both)
Horsepower:
Approx. 6.4 HP @ 7,500 RPM (Estimated, actual may vary slightly)
Torque:
Approx. 7.0 Nm @ 5,500 RPM (Estimated, actual may vary slightly)
Carburetor:
Mikuni VM15SC (Typical, specific model may vary)
Fuel Type:
Unleaded gasoline
Oil Type:
Yamalube 4 (or equivalent SAE 10W-30 API SE or higher motorcycle oil)
Oil Capacity:
0.8 L (0.85 US qt)
Oil Change Interval:
Every 3,000 km (1,800 miles) or 6 months, whichever comes first. (Refer to manual for specific conditions).
Spark Plug Replacement:
Inspect every 1,000 km (600 miles), replace as needed (typically every 5,000-10,000 km).
Valve Clearance Inspection:
Every 6,000 km (3,700 miles) or 12 months.
Fork Oil:
Yamalube Fork Oil 10W (or equivalent)
Brake Fluid:
DOT 3 or DOT 4 (for front and rear drum brake systems, check manual for specific recommendations).
Common Wear Items:
Clutch plates, brake pads/shoes (though drums have longer life), chain and sprockets, air filter clogging due to off-road use.
Engine Performance:
Carburetor jetting can require adjustment based on altitude and riding conditions. Some owners report minor oil leaks from the valve cover gasket with age.
Electrical Issues:
Occasional issues with the kill switch or starting circuit wiring, especially if subjected to harsh conditions or improper maintenance.
Heritage:
Yamaha Motor Corporation has a long and distinguished history in motorcycle manufacturing, known for innovation and performance across various disciplines.
Evolution:
The TTR series represents Yamaha's commitment to the off-road market, with the TTR90 serving as an accessible entry-point for young riders, evolving from earlier TTR models designed for trail riding and motocross introduction.
Production Years:
The TTR90 was produced across several years, with the 2001 model being a representative example of this generation.
