Market Segment:
Entry-level to mid-level dual-sport motorcycle, popular for trail riding, light off-roading, and general recreational use.
Competitors:
Honda CRF230F (later model), Kawasaki KLX250S, Suzuki DR-Z250.
Design Philosophy:
Simple, robust, and reliable design focusing on ease of maintenance and durability for off-road conditions.
Target Audience:
New riders, recreational trail riders, those seeking a low-maintenance and versatile off-road machine.
Systems Covered:
Engine, Transmission, Fuel System, Ignition System, Electrical System, Chassis, Suspension, Brakes, Steering, Cooling System (air), Exhaust System, Frame, Bodywork, Maintenance, Troubleshooting, Specifications
Page Count:
Estimated 200-300 pages (typical for comprehensive service manuals)
Manual Type:
Full Service Repair Manual
Engine Mechanical:
Detailed procedures for disassembly, inspection, repair, and reassembly of all engine components including cylinder head, piston, crankshaft, camshaft, valves, and timing system.
Fuel System:
Carburetor (Mikuni VM series likely) adjustment, cleaning, rebuilding, and troubleshooting, fuel tank, fuel lines, and petcock inspection and replacement.
Ignition System:
CDI ignition system diagnosis, spark plug specifications, coil testing, and troubleshooting.
Transmission Drivetrain:
Clutch inspection, adjustment, and replacement; gearbox disassembly, inspection, and repair, including gears, shift forks, and bearings; final drive chain and sprocket maintenance.
Electrical System:
Wiring diagrams, component testing (lights, horn, starter, battery, stator), troubleshooting electrical faults.
Chassis Suspension Steering:
Front fork disassembly, service, and adjustment; rear shock absorber inspection and replacement; steering head bearing maintenance; swingarm and linkage lubrication and inspection.
Brake System:
Front and rear brake system service including pad replacement, caliper overhaul, brake fluid bleeding, and master cylinder inspection.
Wheels Tires:
Wheel bearing inspection and replacement, tire pressure recommendations, spoke tension adjustment.
Frame Bodywork:
Frame inspection for damage, plastic component removal and installation, seat and fender servicing.
Routine Maintenance:
Oil changes, filter replacement, chain lubrication and adjustment, brake adjustments, air filter cleaning/replacement, spark plug inspection/replacement, valve clearance checks.
Troubleshooting:
Diagnostic procedures for common problems related to starting, running, and electrical systems.
Repair Rebuild:
Comprehensive step-by-step instructions for engine rebuilds, transmission overhauls, carburetor rebuilding, and suspension servicing.
Technical Specifications:
Detailed specifications for torque values, clearances, fluid capacities, and component measurements.
Depth Of Coverage:
Extensive and detailed, suitable for both DIY enthusiasts and professional mechanics. Covers everything from basic servicing to complete engine and transmission rebuilds.
Engine Type:
Air-cooled, four-stroke, SOHC, two-valve single-cylinder
Bore X Stroke:
Approx. 67.0 mm x 63.8 mm
Compression Ratio:
Approx. 9.5:1
Carburetor:
Mikuni VM26SS (likely)
Ignition:
CDI (Capacitor Discharge Ignition)
Horsepower Estimate:
Approx. 18-20 hp @ 7500 RPM
Torque Estimate:
Approx. 14-16 lb-ft @ 6000 RPM
Fuel Type:
Unleaded gasoline
Fuel Tank Capacity:
Approx. 2.5 Gallons (9.5 Liters)
Oil Change Interval:
Every 1,000 miles (1600 km) or 6 months, whichever comes first. Manual specifies exact oil type and capacity.
Air Filter Cleaning:
Every 500 miles (800 km) or every 3 months. Manual details proper cleaning and oiling procedure.
Chain Maintenance:
Lubricate and adjust chain every 300 miles (500 km). Manual provides adjustment procedure and chain wear checks.
Valve Clearance Check:
Every 6,000 miles (10,000 km) or 12 months. Manual provides detailed procedure and specifications.
Engine Oil:
Yamalube 4 (or equivalent SAE 10W-30 API SG or higher)
Brake Fluid:
DOT 3 or DOT 4 brake fluid
Engine Oil Capacity:
Approx. 1.7 liters (1.8 US qt) with filter change.
Common Wear Items:
Clutch plates, rear brake pads, air filter, chain and sprockets due to off-road use. Manual provides replacement procedures.
Carburetor Issues:
Can become clogged with debris if fuel is not clean, affecting performance. Manual guides on cleaning and rebuilding.
Suspension Service:
Fork seals can wear over time, especially with aggressive off-road use. Manual details fork seal replacement.
Yamaha Legacy:
Yamaha Motor Company is renowned for its innovation and quality in motorcycles, musical instruments, and other powered products, with a long history of success in motorsports.
Ttr Lineage:
The TTR series is Yamaha's line of reliable, air-cooled off-road motorcycles, known for their ease of use and accessibility. The TTR-225 replaced the TTR-200 and was a popular choice for its blend of performance and user-friendliness.
Production Period:
The TTR-225 was produced from the mid-1990s until the early 2000s, with the 1999 model representing a solid iteration of this durable dual-sport platform.
