Segment:
Entry-level youth dirt bike, designed for learning and recreational riding.
Competitors:
Honda CRF70F, Kawasaki KLX110 (though slightly larger engine), Suzuki JR80.
Features:
Compact size, approachable power delivery, automatic clutch (on most versions), durable and simple design for ease of maintenance.
Audience:
Beginner riders, young enthusiasts, parents looking for a safe and reliable first off-road motorcycle.
Primary Coverage:
Complete Service, Repair, and Workshop information for the Yamaha TTR90.
Estimated Page Count:
Detailed page count not specified in product description; typical for this type of manual can range from 200-500 pages.
Type:
Service Repair Workshop Manual
Language:
Likely English (standard for most Yamaha service manuals sold internationally).
Format:
Likely Digital (PDF) given the online sales context and mention of links for other years.
Engine System:
Engine disassembly, assembly, inspection, troubleshooting, specifications, tuning.
Fuel System:
Carburetor operation, adjustment, cleaning, fuel tank, fuel lines, fuel pump (if applicable).
Ignition System:
CDI unit, ignition coil, spark plug, wiring diagrams, timing.
Transmission Drivetrain:
Clutch operation, gearbox internals, gear ratios, lubrication, drive chain maintenance.
Suspension System:
Front fork service, rear shock absorber, linkage maintenance, spring rates, damping adjustments.
Braking System:
Front and rear brake mechanism, fluid specifications, bleeding procedures, pad replacement, rotor inspection.
Electrical System:
Wiring diagrams, lighting, switches, battery, charging system, starter motor.
Frame Chassis:
Frame inspection, steering head bearing service, swingarm maintenance.
Bodywork Plastics:
Fairing removal and installation, seat, fenders, graphics.
Maintenance:
Routine checks, oil changes, filter replacement, chain adjustment, spark plug replacement, valve clearance adjustment.
Troubleshooting:
Diagnostic procedures for common starting, running, and electrical issues.
Repair Rebuild:
Step-by-step instructions for component disassembly, cleaning, inspection, and reassembly.
Specifications Data:
Torque values, clearances, fluid capacities, electrical resistance values, tuning parameters.
Depth:
Comprehensive, covering basic maintenance to major overhauls and diagnostics.
Format Details:
Digital (PDF) format typically allows for easy searching, printing, and viewing on multiple devices.
Print Quality Description:
Assumed to be of good quality, suitable for printing critical pages, with clear diagrams and text.
Binding Type Description:
N/A (for digital format). If printed, typically spiral-bound or saddle-stitched for ease of use in a workshop.
Paper Type Description:
N/A (for digital format). Original factory manuals are often printed on durable, glossy paper.
Engine Type:
Four-stroke, SOHC, air-cooled
Displacement:
88 cc (for the TTR90)
Bore X Stroke:
47.0 mm x 51.0 mm (typical for this engine family)
Compression Ratio:
9.5:1 (typical for this engine family)
Horsepower:
Approx. 8-9 HP (estimated, actual figures vary by tuning and specific model year).
Torque:
Approx. 7-8 Nm (estimated).
Carburetor Type:
Mikuni VM17 (typical for this model)
Fuel Type:
Unleaded gasoline
Oil Type:
Yamaha Yamalube (or equivalent SAE 10W-30 API SE, SF, SG, SH, SJ or higher motorcycle oil)
Ignition System:
CDI (Capacitor Discharge Ignition)
Transmission Type:
Semi-automatic / Automatic (3-speed with automatic clutch on most models)
Optional Transmission:
Some early or specific variants might have had a manual clutch, but the common TTR90 is known for its automatic clutch.
Clutch Type:
Automatic centrifugal clutch
Transmission Oil Type:
Yamaha Gear Oil (or equivalent SAE 80 API GL-4)
Safety Ratings:
Not applicable for off-road motorcycles in the same way as passenger vehicles; emphasis is on rider safety through design and maintenance.
Active Safety Features:
Responsive braking system, predictable handling, low center of gravity for stability.
Passive Safety Features:
Durable frame, padded seat, often comes with handguards for rider protection.
Oil Change Interval:
Every 1000 km (600 miles) or 6 months, whichever comes first (refer to manual for exact Yamaha recommendations).
Air Filter Cleaning:
Every 500 km (300 miles) or as needed based on riding conditions.
Spark Plug Replacement:
Every 3000 km (1800 miles) or as needed, check gap regularly.
Valve Clearance Check:
Every 3000 km (1800 miles) or 24 months.
Engine Oil Capacity:
Approx. 0.90 L (0.95 US qt) without oil filter change, 1.00 L (1.06 US qt) with oil filter change (check manual for exact specification for 2000 TTR90).
Fork Oil Type:
Yamaha Fork Oil G-10 (or equivalent SAE 10W fork oil)
Brake Fluid Type:
DOT 3 or DOT 4 brake fluid
Common Problems:
Carburetor gumming if not run regularly, occasional clutch slippage if abused, front fork seals can leak over time.
Spark Plug Part Number:
CR6HSA (NGK) or equivalent.
Air Filter Part Number:
Likely a specific foam or paper element, e.g., 5KM-14451-00-00 (verify with manual).
Heritage:
Yamaha has a long and successful history in motocross and off-road motorcycling, dating back to the early days of competitive dirt biking.
Evolution:
The TTR series, including the TTR90, was Yamaha's introduction to the youth segment, focusing on ease of use and reliability for novice riders, evolving from earlier trail bike designs.
Production Period:
The TTR90 was produced from the late 1990s through the early 2000s, typically replaced by the TTR110.
