Target Audience:
Owners and mechanics of Yamaha TTR 90 motorcycles from 2004 to 2006, seeking in-depth repair and maintenance information.
Value Proposition:
Provides comprehensive, detailed information that can significantly reduce repair costs and improve vehicle longevity.
Completeness:
Covers all aspects of repair, maintenance, and refurbishment, making it a single-source solution.
Detail Level:
Hundreds of pages packed with detailed instructions and diagrams.
Organization:
Superb Table of Contents for efficient navigation.
Engine:
Complete engine overhaul, diagnosis, disassembly, assembly, tuning, and component-specific repairs.
Transmission:
Clutch operation, gear shifting mechanisms, internal transmission component inspection and repair.
Fuel System:
Carburetor adjustment and cleaning, fuel delivery system inspection, fuel tank and lines.
Ignition System:
Spark plug specifications, ignition timing, CDI unit testing, electrical component diagnostics.
Cooling System:
Air-cooling system inspection and maintenance (if applicable for this model variant).
Suspension:
Front fork service, rear shock absorber inspection and replacement, linkage maintenance.
Brakes:
Front and rear brake system maintenance, pad replacement, caliper service, fluid bleeding.
Electrical System:
Wiring diagrams, lighting system, battery maintenance, starter system, troubleshooting electrical faults.
Chassis And Frame:
Frame inspection, component mounting, steering system service.
Wheels And Tires:
Tire pressure recommendations, wheel bearing inspection, spoke tensioning (if applicable).
Maintenance:
Routine maintenance checks, oil changes, filter replacements, lubrication points, pre-ride inspections.
Repair:
Step-by-step repair instructions for all major vehicle systems, including engine rebuilds and component replacements.
Troubleshooting:
Diagnostic procedures for common and uncommon issues, fault finding guides, symptom-to-cause analysis.
Rebuilding:
Detailed instructions for complete engine and transmission rebuilding, including torque specifications and clearances.
Refurbishment:
Guidance on restoring various components and the overall vehicle appearance and function.
Restoration:
Advice on bringing the TTR 90 back to its original factory specifications and condition.
Depth:
Comprehensive, suitable for professional mechanics and experienced DIY enthusiasts.
Engine Type:
Single-cylinder, 4-stroke, SOHC, 2-valve (Typical for TTR90, specific details may vary by variant)
Displacement:
Approximately 88cc (Common for TTR90, specific variant may differ)
Bore X Stroke:
Refer to manual for precise specifications (e.g., 47.0 x 51.8 mm typical).
Compression Ratio:
Refer to manual for precise specifications (e.g., 10.7:1 typical).
Horsepower:
Refer to manual for precise specifications (e.g., around 8-9 HP typical).
Torque:
Refer to manual for precise specifications.
Fuel Delivery:
Carburetor (Mikuni VM17 typical).
Carburetor Model:
Refer to manual for specific model and jetting details.
Oil Type:
Yamalube 4 (or equivalent SAE 10W-30 API SG or higher motorcycle oil).
Oil Capacity:
Refer to manual for precise capacity (e.g., 0.95 L / 1.0 US qt typical).
Ignition System Type:
CDI (Capacitor Discharge Ignition).
Spark Plug Type:
Refer to manual for exact plug type and gap (e.g., NGK CR7HSA typical).
Transmission Type:
Automatic (Semi-automatic with 4-speed gearbox).
Optional Transmission:
N/A
Clutch Type:
Wet, multiple-disc clutch.
Gear Ratios:
Refer to manual for detailed gear ratios.
Transmission Fluid Type:
Yamaha Gear Oil (or equivalent SAE 80 API GL-4).
Transmission Fluid Capacity:
Refer to manual for precise capacity (e.g., 0.35 L typical).
Length:
Refer to manual for exact dimensions (e.g., 1650 mm / 65.0 in typical).
Width:
Refer to manual for exact dimensions (e.g., 730 mm / 28.7 in typical).
Height:
Refer to manual for exact dimensions (e.g., 995 mm / 39.2 in typical).
Wheelbase:
Refer to manual for exact dimensions (e.g., 1170 mm / 46.1 in typical).
Ground Clearance:
Refer to manual for exact dimensions (e.g., 265 mm / 10.4 in typical).
Dry Weight:
Refer to manual for exact weight (e.g., 73 kg / 161 lbs typical).
Wet Weight:
Refer to manual for exact weight.
Fuel Capacity:
Refer to manual for exact capacity (e.g., 4.0 L / 1.06 US gal typical).
Safety Ratings:
Not applicable to off-road motorcycles in the same way as passenger vehicles. Focus is on operational safety and design integrity.
Braking System:
Disc front brake, drum rear brake (typical configuration).
Frame Construction:
Durable steel frame designed for off-road use.
Lighting:
Headlight, taillight, brake light for visibility (check specific model year features).
Infotainment System:
N/A - Recreational off-road motorcycle with basic instrumentation.
Driver Assistance Features:
N/A - Basic motorcycle design.
Connectivity Options:
N/A
Dashboard Features:
Basic instrumentation typically includes a speedometer (if equipped), odometer, and indicator lights.
Engine Oil Change:
Refer to manual for specific mileage or time intervals (e.g., every 1000 km or 6 months typical).
Air Filter Cleaning:
Refer to manual for specific intervals based on riding conditions (e.g., every 500 km or as needed).
Spark Plug Inspection:
Refer to manual for specific intervals (e.g., every 1000 km typical).
Brake Fluid Change:
Refer to manual for recommended intervals (e.g., every 2 years).
Engine Oil Spec:
Yamalube 4 or equivalent SAE 10W-30 API SG or higher motorcycle oil.
Transmission Oil Spec:
Yamaha Gear Oil or equivalent SAE 80 API GL-4.
Brake Fluid Spec:
DOT 3 or DOT 4 (refer to manual for exact specification).
Common Wear Items:
Clutch plates, brake pads, tires, and sprockets are common wear items requiring regular inspection and replacement.
Carburetor Cleaning:
Carburetors can become clogged with debris or fuel varnish over time, requiring periodic cleaning and adjustment.
Suspension Seals:
Fork seals may eventually leak, requiring replacement to prevent oil loss and maintain damping performance.
Brand History:
Yamaha Motor Company is a globally recognized leader in motorcycles, musical instruments, and marine products, known for innovation and quality since its founding in 1955.
Ttr Series:
The TTR series represents Yamaha's line of trail-ready recreational off-road motorcycles, designed for ease of use and durability.
Ttr90 Positioning:
The TTR 90 was positioned as an entry-level trail bike, ideal for younger riders or beginners transitioning to off-road riding.
Production Period:
Yamaha TTR 90 models were produced for several years, with this manual covering the 2004-2006 model years.
Manufacturing Location:
Typically manufactured in Japan or by Yamaha's international partners.
Awards And Recognition:
While specific awards for the TTR 90 may not be widely documented, Yamaha's TTR line consistently receives positive reviews for its reliability and suitability for its intended purpose.
Owner Satisfaction:
Generally high owner satisfaction for its class due to ease of use and durability.
Certification Standards:
Complies with relevant emissions and safety standards for off-road vehicles in its production markets.
