Target Audience:
Yamaha MOTO-4 250 owners seeking to perform maintenance, repairs, or understand their ATV's operation
Value Proposition:
Provides comprehensive, accurate, and easily searchable information for a specific model range, including hard-to-find owner's manuals for older vehicles.
Uniqueness:
Combination of a detailed workshop manual and a printable owner's manual, specifically curated and confirmed for the 1989-1991 MOTO-4 250.
Usability:
Searchable PDF format with bookmarks enhances user experience and efficiency.
Primary Coverage:
Comprehensive Workshop Repair and Owner's Maintenance
Scope:
Wheel to Wheel, Full ATV/UTV Coverage
Estimated Pages Service Manual:
Varies by specific model year, typically 200-400 pages
Estimated Pages Owner Manual:
Varies by specific model year, typically 50-100 pages
Service Manual:
Workshop Repair Manual
Owner Manual:
Maintenance Manual / Operator's Guide
Engine:
Engine rebuild, valve jobs, troubleshooting, internal components
Transmission:
Transmission overhaul, clutch, gearbox, driveline
Suspension:
Front and rear suspension components, adjustments, repair
Electrical System:
Wiring diagrams, ignition, lighting, charging system, troubleshooting
Braking System:
Brake caliper, master cylinder, fluid, service procedures
Fuel System:
Carburetor, fuel lines, fuel pump (if applicable), tank
Cooling System:
Cooling fan, radiator, coolant, if liquid-cooled
Exhaust System:
Muffler, exhaust pipe, heat shields
Chassis And Frame:
Frame inspection, steering components, wheel hubs
Bodywork And Plastics:
Fender, body panels, seating, handlebar
Maintenance:
Scheduled maintenance, adjustments, fluid changes, lubrication
Troubleshooting:
Diagnostic procedures, common problems, fault finding
Repair:
Component disassembly, assembly, replacement, and repair
Rebuilds:
Engine rebuild, transmission overhaul, carburetor rebuild
Adjustments:
Carburetor adjustment, chain tension, brake lever adjustment
Installation:
Optional accessory installation guidance (where applicable)
Depth Level:
Expert level, suitable for professional mechanics and experienced DIYers
Detail Level:
Detailed procedures with pictures
Diagrams:
Exploded parts diagrams for component identification and reassembly
Searchability:
Keyword searchable (Ctrl+F enabled)
Bookmarking:
Bookmarked for easy navigation
Print Readability:
High quality, optimized for printing
Binding:
Digital PDF (no physical binding)
Paper:
N/A (Digital Format)
Engine Type:
Four-stroke, single-cylinder, SOHC, air-cooled
Displacement:
230 cc (approximate, based on common MOTO-4 250 configurations)
Bore X Stroke:
Typically around 68.5 mm x 64 mm (verify with specific manual)
Compression Ratio:
Typically around 9.0:1 to 9.5:1 (verify with specific manual)
Horsepower:
Approximately 15-20 HP (varies by year and tuning)
Torque:
Approximately 13-16 lb-ft (varies by year and tuning)
Carburetor Type:
Mikuni VM series (e.g., VM26SS or similar)
Fuel Type:
Unleaded gasoline
Fuel Tank Capacity:
Typically 2.5 - 3.0 gallons (verify with specific manual)
Oil Type:
SAE 10W-30 or 10W-40 motorcycle-specific or ATV engine oil (API SG or higher)
Oil Capacity:
Approximately 1.5 - 1.8 quarts (verify with specific manual)
Transmission Type:
5-speed constant mesh, manual clutch
Optional Transmission:
N/A (Standard manual transmission)
Clutch Type:
Wet, multi-disc
Transmission Oil Type:
Yamaha Genuine Gear Oil or equivalent SAE 80W API GL-4 (verify with specific manual)
Transmission Oil Capacity:
Approximately 0.7 - 0.9 quarts (verify with specific manual)
Length:
Approx. 72-75 inches (verify with specific manual)
Width:
Approx. 40-43 inches (verify with specific manual)
Height:
Approx. 43-46 inches (verify with specific manual)
Dry Weight:
Approx. 380-400 lbs (verify with specific manual)
Curb Weight:
Approx. 400-420 lbs (verify with specific manual)
Payload Capacity:
Typically 200-300 lbs (verify with specific manual)
Front Tire Size:
AT23x8-12 or AT24x8-12 (verify with specific manual)
Rear Tire Size:
AT23x10-10 or AT24x10-10 (verify with specific manual)
Wheel Bolt Pattern:
4x110 mm (verify with specific manual)
Atv Safety Standards:
Meets relevant industry safety standards for ATVs of its era.
Braking System:
Front and rear drum brakes or disc brakes (depending on specific model year and trim), operated by handlebar levers and foot pedal.
Lighting:
Headlight, taillight/brake light for visibility.
Handlebar Design:
Ergonomic handlebar with handgrips for control and comfort.
Infotainment Features:
N/A (Basic ATV design focused on functionality, not infotainment).
Driver Assistance Features:
N/A (No electronic driver assistance systems).
Connectivity Features:
N/A (No electronic connectivity features).
Oil Change Interval:
Every 1,000 miles or 6 months (refer to manual for precise intervals).
Air Filter Cleaning:
Every 500 miles or annually (more frequently in dusty conditions).
Spark Plug Replacement:
Every 6,000 miles (verify specific plug type and gap).
Valve Clearance Check:
Every 6,000 miles or annually.
Chain Lubrication And Adjustment:
Every 300 miles or after washing/wet riding.
Brake Fluid Type:
DOT 3 or DOT 4 (verify with manual for specific brake system).
Coolant Type:
Permanent type antifreeze (e.g., ethylene glycol based) mixed with distilled water, 50/50 ratio (if liquid-cooled).
Carburetor Performance:
Can be prone to gumming up if fuel sits for extended periods; requires regular cleaning and adjustment.
Electrical Connections:
Older wiring harnesses may develop corrosion or loose connections; periodic inspection and cleaning are recommended.
Suspension Wear:
Bushings and seals can wear over time, leading to a less responsive ride; replacement is part of standard maintenance.
Yamaha Atv History:
Yamaha has a long history of producing reliable and performance-oriented ATVs, with the MOTO-4 series being a significant part of their early ATV lineup.
Moto-4 Lineage:
The MOTO-4 series was Yamaha's entry into the sport/utility ATV market, evolving from earlier trike models and paving the way for more advanced models.
Manufacturing Location:
Primarily manufactured in Japan.
Production Period:
The MOTO-4 250 was produced through the late 1980s and early 1990s.
