Vehicle Type:
Off-road motorcycle, entry-level/youth motocross/trail bike.
Target Audience:
Young riders, beginner motocross enthusiasts, trail riders, parents maintaining bikes for children.
Competitors:
Honda CRF70F/CRF90F, Kawasaki KLX110, Suzuki DR-Z70/DR-Z90.
Value Proposition:
Cost savings on maintenance and repairs, empowers owners to perform their own servicing.
Manual Benefit:
Provides the official factory procedures and specifications for optimal vehicle performance and longevity.
Primary Coverage:
Service, Repair, Maintenance, Rebuild, Refurbishment, Restoration
Estimated Page Count:
Extensive (Typical for comprehensive service manuals, often 300-600 pages)
Type:
Workshop Service Repair Manual
Format:
Downloadable Digital Format (Likely PDF)
Engine:
Engine disassembly, assembly, overhaul, cooling system, lubrication system, fuel system, ignition system, starting system, exhaust system.
Transmission:
Clutch operation and adjustment, transmission disassembly and assembly, gear shifting mechanisms.
Chassis:
Frame inspection and repair, suspension (front and rear), steering system, brake system (front and rear), wheels and tires.
Electrical:
Wiring diagrams, lighting system, ignition system, charging system (if applicable), battery maintenance, troubleshooting electrical faults.
Bodywork:
Body panel removal and installation, seat maintenance, handlebar and control lever adjustment.
Maintenance:
Routine checks, oil changes, filter replacements, chain adjustment and lubrication, brake pad inspection, spark plug service, air filter cleaning/replacement.
Troubleshooting:
Diagnostic procedures for common problems, identification of symptoms and causes, repair solutions.
Repair:
Step-by-step instructions for component removal, repair, and reinstallation for all major systems.
Rebuild Refurbishment:
Detailed instructions for complete engine, transmission, and suspension overhauls.
Depth:
Comprehensive, covering from basic user maintenance to advanced mechanical repairs and diagnostics.
Engine Type:
Four-stroke, SOHC
Bore X Stroke:
Approx. 50.0 mm x 45.4 mm (Consult manual for exact spec)
Compression Ratio:
Approx. 9.3:1 (Consult manual for exact spec)
Horsepower:
Estimated 8-10 HP (Consult manual for exact spec)
Torque:
Estimated 6-7 lb-ft (Consult manual for exact spec)
Fuel Delivery:
Carburetor (Likely Mikuni VM series, specific model in manual)
Fuel Type:
Unleaded gasoline (Consult manual for octane rating recommendation)
Fuel Tank Capacity:
Approx. 1.5 Liters (0.4 US gal) (Consult manual for exact spec)
Ignition Type:
CDI (Capacitor Discharge Ignition)
Oil Type:
API SE, SF, SG or SH classification, SAE 10W-30 or 20W-40 motorcycle oil recommended (Consult manual for precise specification and API rating).
Oil Capacity:
Approx. 0.9 Liters (0.95 US qt) (Consult manual for exact spec)
Type:
Automatic Centrifugal Clutch with Manual 4-Speed Gearbox
Clutch Operation:
Automatic engagement based on engine RPM.
Gear Ratios:
Detailed gear ratios provided within the manual.
Transmission Oil Type:
Same as engine oil: API SE, SF, SG or SH classification, SAE 10W-30 or 20W-40 motorcycle oil recommended (Consult manual for precise specification).
Transmission Oil Capacity:
Refer to engine oil capacity, as it's a shared system.
Length:
Approx. 1585 mm (62.4 in) (Consult manual for exact spec)
Width:
Approx. 720 mm (28.3 in) (Consult manual for exact spec)
Height:
Approx. 995 mm (39.2 in) (Consult manual for exact spec)
Wheelbase:
Approx. 1105 mm (43.5 in) (Consult manual for exact spec)
Dry Weight:
Approx. 73 kg (161 lbs) (Consult manual for exact spec)
Curb Weight:
Approx. 79 kg (174 lbs) (Consult manual for exact spec)
Safety Ratings:
N/A (As an off-road motorcycle, formal crash test ratings are not typically applicable).
Braking System:
Front: Drum brake; Rear: Drum brake (Consult manual for specific brake system details and maintenance procedures).
Suspension System:
Front: Telescopic fork; Rear: Swingarm with Monocross suspension (Consult manual for suspension travel and adjustment specs).
Frame Type:
Steel diamond frame (Consult manual for frame inspection and repair).
Infotainment Systems:
N/A (This is a basic off-road motorcycle, no infotainment features).
Driver Assistance Features:
N/A (No electronic driver assistance features).
Connectivity Options:
N/A (No connectivity features).
Oil Change Interval:
Recommended every 1000 km (600 miles) or 6 months, or more frequently depending on operating conditions (Consult manual for precise schedule).
Air Filter Cleaning Interval:
Recommended every 20 hours or 3 months, more frequent in dusty conditions (Consult manual for precise schedule).
Spark Plug Inspection Interval:
Recommended every 1000 km (600 miles) or 6 months (Consult manual for precise schedule).
Chain Lubrication And Adjustment:
Check and lubricate every 500 km (300 miles) or as needed, adjust slack regularly (Consult manual for precise specifications).
Engine Oil Specification:
API SE, SF, SG or SH classification, SAE 10W-30 or 20W-40 motorcycle oil recommended (Consult manual for precise specification).
Brake Fluid Type:
DOT 3 or DOT 4 Brake Fluid (If applicable to drum brake master cylinders, consult manual for specifics).
Common Wear Items:
Brake pads/shoes, clutch plates (due to automatic clutch), sprockets, chain, spark plug, air filter.
Potential Problems:
Carburetor clogging due to infrequent use or poor fuel quality, suspension wear from aggressive riding, chain and sprocket wear.
Yamaha Motorsports:
Yamaha has a long and successful history in motorsports, particularly in motocross and off-road riding, known for producing reliable and performance-oriented off-road motorcycles.
Ttr Series Lineage:
The TTR line is Yamaha's series of off-road recreational bikes, with the TTR90 being an entry-level model designed for younger or less experienced riders, succeeding smaller displacement models and preceding larger TTR variants.
Manufacturing Origin:
Likely manufactured in Japan or Southeast Asia (Consult manual for specific regional information if available).
