Target Audience:
Owners of the Yamaha TTR 90 (2003 model) seeking to perform maintenance, repairs, or understand their motorcycle's systems.
Value Proposition:
Provides essential information for DIY maintenance and repair, saving on dealership service costs and enabling owners to keep their TTR 90 in optimal condition.
Illustration Quality:
Features clear, step-by-step instructions accompanied by detailed illustrations and diagrams, enhancing understanding and accuracy during repair.
Searchability:
PDF format typically allows for keyword searching, making it easier to locate specific information quickly.
Systems Covered:
Engine, Transmission, Chassis, Suspension, Brakes, Electrical System, Fuel System, Cooling System, Lubrication System, Bodywork, Troubleshooting, Maintenance
Page Count:
Estimated 200-300 pages (based on typical repair manuals for this class of vehicle; exact count not provided)
Manual Type:
Repair Workshop Service Manual
Engine:
Detailed breakdown of the TTR90's air-cooled, four-stroke engine, including cylinder, piston, crankshaft, valve train, and camshaft specifications and procedures.
Transmission:
Coverage of the semi-automatic transmission, gear shifting mechanisms, clutch operation, and internal transmission components.
Suspension:
Front telescopic forks and rear monoshock absorber maintenance, adjustment, and potential overhaul procedures.
Brakes:
Front and rear drum brake system inspection, adjustment, and component replacement.
Electrical System:
Wiring diagrams, ignition system troubleshooting, lighting circuits, and battery maintenance.
Fuel System:
Carburetor disassembly, cleaning, adjustment, and fuel tank/petcock maintenance.
Cooling System:
N/A (Air-cooled engine)
Lubrication System:
Engine oil change procedures, oil filter replacement, and lubrication points.
Bodywork:
Fairing, seat, handlebars, and fender removal and installation.
Routine Maintenance:
Oil changes, chain lubrication and adjustment, air filter cleaning/replacement, spark plug inspection, brake adjustments.
Troubleshooting:
Systematic diagnostic procedures for common performance issues, starting problems, and operational anomalies.
Major Repairs:
Engine top-end and potentially bottom-end rebuilds, transmission servicing, carburetor overhauls.
Component Replacement:
Instructions for replacing wear items such as brake pads, cables, tires, and bearings.
Diagnostic Capabilities:
Detailed diagnostic flowcharts and symptom-based troubleshooting guides for electrical and mechanical issues.
Rebuild Instructions:
Comprehensive step-by-step instructions with torque specifications for engine and transmission component rebuilds.
Adjustment Procedures:
Precise instructions for adjusting the carburetor, clutch, throttle, and brakes.
Engine Type:
Air-cooled, SOHC, four-stroke
Displacement:
88 cc (5.37 cubic inches)
Bore X Stroke:
Approx. 50.0 mm x 45.2 mm (Exact specifications would be in the manual)
Compression Ratio:
Approx. 9.5:1 (Typical for this engine class)
Valve Train:
SOHC, 2 valves per cylinder
Horsepower:
Not explicitly stated, but typically in the 6-8 HP range for this displacement and design.
Torque:
Not explicitly stated, but a low-end focused torque curve.
Carburetor Type:
Mikuni VM17SH (or similar constant velocity type), single carburetor
Fuel Type:
Unleaded gasoline
Fuel Capacity:
Approximately 4.0 Liters (1.06 Gallons)
Overall Length:
Approx. 1640 mm (64.6 inches)
Overall Width:
Approx. 725 mm (28.5 inches)
Overall Height:
Approx. 985 mm (38.8 inches)
Seat Height:
Approx. 710 mm (28.0 inches)
Wheelbase:
Approx. 1125 mm (44.3 inches)
Dry Weight:
Approx. 72 kg (159 lbs)
Wet Weight:
Not specified, but typically around 78-80 kg with fluids.
Crash Test Ratings:
N/A (Motorcycle, not subject to standard automotive crash testing)
Braking System:
Front and rear drum brakes for controlled deceleration.
Tire Design:
Knobby tires designed for off-road traction and stability.
Frame Construction:
Steel semi-double cradle frame for rider stability and impact absorption.
Lighting:
Headlight and taillight for visibility.
Engine Oil Change:
Typically every 1,000-2,000 km (600-1,200 miles) or annually, whichever comes first. Refer to manual for exact interval.
Air Filter Cleaning:
Check and clean every 500-1000 km (300-600 miles), depending on operating conditions. Replace as needed.
Spark Plug Inspection:
Inspect every 1,000-2,000 km (600-1,200 miles) for wear and proper gap. Replace as needed.
Chain Lubrication Adjustment:
Lubricate every 500 km (300 miles) and check tension at the same interval. Adjust to specified slack.
Engine Oil Type:
Yamaha recommends Yamalube 4 Stroke Motorcycle Oil or equivalent SAE 10W-30 API SE, SF, SG, SH, SJ, or SL classification. Check manual for specific viscosity and API rating.
Engine Oil Capacity:
Approximately 0.80 Liters (0.85 US qt) without oil filter change; 0.90 Liters (0.95 US qt) with oil filter change. (Consult manual for exact capacity).
Carburetor Fouling:
Can occur due to infrequent use or stale fuel, leading to starting difficulties or poor running. Regular cleaning and use of fuel stabilizer are recommended.
Chain And Sprocket Wear:
As with most chain-driven vehicles, regular maintenance is crucial to prevent premature wear of the drive chain and sprockets.
Suspension Seals:
Fork seals can degrade over time, leading to oil leaks. Regular inspection and maintenance are advised.
Yamaha Legacy:
Yamaha Motor Company, established in 1955, has a long and successful history in motorcycle manufacturing, known for innovation, performance, and reliability across various segments.
Ttr Series:
The TTR line is Yamaha's range of trail-oriented off-road motorcycles, designed for accessibility and fun for riders of all ages and skill levels. The TTR 90 is an entry-level model.
Manufacturing Location:
Likely manufactured in Japan or at Yamaha's international production facilities.
