Vehicle Segment:
Entry-level to mid-range recreational ATV, popular for trail riding and light utility work.
Target Audience:
Recreational riders, casual trail users, and those seeking a reliable, straightforward ATV.
Key Competitors:
Other 200-250cc class ATVs from manufacturers like Honda (e.g., TRX200), Suzuki (e.g., LT230), and Kawasaki (e.g., KLT200/250).
Engine Type:
Simple, air-cooled, overhead valve (OHV) engine known for its durability and ease of maintenance.
Transmission:
Typically features a manual clutch with a 5-speed or 6-speed transmission, offering good gear selection for varied terrain.
Drivetrain Type:
Shaft-driven rear-wheel drive (RWD) for simplicity and reduced maintenance compared to chain drive.
Suspension Layout:
Independent front suspension (IFS) for better ride comfort and control, paired with a swingarm rear suspension.
Braking System:
Drum brakes front and rear, or front disc and rear drum, offering reliable stopping power.
Engine:
Complete engine disassembly, assembly, inspection, and tuning procedures for the 225cc engine.
Fuel System:
Carburetor overhaul, inspection, adjustment, fuel tank, fuel lines, and fuel pump (if applicable).
Ignition System:
CDI ignition system diagnosis, testing, component replacement (stator, coil, spark plug).
Drivetrain:
Clutch operation, transmission disassembly and assembly, gear shift mechanism, drive shafts, and final drive.
Suspension:
Front and rear suspension fork service, shock absorber inspection and replacement, bushings, and linkage maintenance.
Brakes:
Front and rear brake system inspection, maintenance, adjustment, caliper service, brake fluid replacement, and bleeding procedures.
Electrical System:
Wiring diagrams, lighting system, battery maintenance, starter system, charging system (stator, regulator/rectifier), and fuse/relay identification.
Frame And Body:
Chassis inspection, handlebar and control assembly, seat, fenders, and plastic component removal/installation.
General Maintenance:
Routine service, oil changes, filter replacements, lubrication points, and pre-ride inspections.
Troubleshooting:
Diagnostic flowcharts and common problem identification for engine, electrical, and mechanical issues.
Repair Procedures:
Step-by-step instructions for component replacement and repair, including torque specifications.
Carburetor Tuning:
Detailed instructions for cleaning, rebuilding, and adjusting the carburetor for optimal performance.
Valve Adjustment:
Procedures for checking and adjusting valve clearance.
Engine Rebuild:
Comprehensive guide for complete engine overhauls, including piston, cylinder, and crankshaft service.
Electrical Diagnostics:
Guidance on using multimeters and test equipment to diagnose electrical faults.
Depth Level:
Comprehensive: Covers everything from basic maintenance and fluid checks to complete engine and drivetrain rebuilds.
Diagnostic Capability:
High: Includes diagnostic charts and procedures for identifying and resolving mechanical and electrical issues.
Specifications Detail:
Detailed: Provides precise torque values, clearances, fluid capacities, and electrical resistance measurements.
Digital Format:
PDF (if digital); High-resolution scans of original printed manual.
Print Quality:
N/A (for original print); High clarity for digital reproduction.
Binding Type:
Original: Spiral bound or saddle-stitched; Digital: PDF.
Paper Type:
Original: Durable, coated paper designed for shop use; Digital: N/A.
Searchability:
Yes (for PDF versions with OCR); Index provided in print version.
Engine Type:
Four-stroke, air-cooled, SOHC (Single Overhead Camshaft) or OHV (Overhead Valve) configuration.
Displacement:
Approximately 223cc to 225cc (exact displacement may vary slightly by specific sub-model).
Bore X Stroke:
Specific dimensions are detailed in the manual, typically around 66mm x 65mm for this class.
Compression Ratio:
Typically around 9.5:1 to 10.5:1, specified in the manual.
Power Output Hp:
Estimated 15-20 HP at around 6,000-7,000 RPM (actual figures in manual).
Torque Ft Lbs:
Estimated 15-18 lb-ft at around 5,000 RPM (actual figures in manual).
Carburetor Model:
Mikuni VM series or similar single carburetor (e.g., VM26, VM28), specifics in manual.
Cooling System:
Forced air cooling.
Fuel Type:
Unleaded gasoline.
Fuel Tank Capacity:
Typically 2.5-3.0 gallons (approx. 9.5-11.4 liters).
Fuel Delivery:
Gravity feed from tank to carburetor.
Transmission Type:
5-speed or 6-speed manual transmission with manual clutch operation.
Clutch Type:
Wet, multi-plate manual clutch.
Reverse Gear:
Some models may be equipped with a reverse gear, check specific model variant.
Final Drive:
Shaft drive to rear axle.
Gear Ratios:
Detailed gear ratios for all speeds and final drive ratio are provided in the service manual.
Transmission Fluid Type:
Yamalube Gear Oil or equivalent SAE 10W-30 or 10W-40 API SE, SF engine oil is often specified for shared lubrication with the engine.
Length:
Approximately 71-74 inches (180-188 cm).
Width:
Approximately 40-42 inches (101-107 cm).
Height:
Approximately 41-43 inches (104-109 cm).
Wheelbase:
Approximately 47-49 inches (119-124 cm).
Dry Weight:
Approximately 350-380 lbs (159-172 kg).
Ground Clearance:
Around 5-6 inches (12-15 cm), depending on suspension setup and tire size.
Rack Capacity Front:
Typically rated for a certain weight, specified in the owner's manual.
Rack Capacity Rear:
Typically rated for a certain weight, specified in the owner's manual.
Atv Safety Standards:
Designed to meet relevant safety standards for ATVs of its era. Specific certifications not typically highlighted.
Braking System Type:
Drum brakes (front and rear) or front disc/rear drum configurations, providing reliable stopping power.
Throttle Limiter:
Some models may have had adjustable throttle limiters for younger or less experienced riders.
Footwells:
Integrated footwells with heel guards for rider protection.
Handguards:
Basic handguards or brush guards may be standard or optional.
Engine Oil Change:
Every 1,000 km or 6 months, whichever comes first (typical interval, check manual for specifics).
Air Filter Cleaning:
Every 600 km or as needed based on riding conditions; replace as necessary.
Spark Plug Replacement:
Every 3,000 km or annually.
Valve Clearance Check:
Every 2,000 km or 12 months.
Engine Oil Type:
Yamalube 4 (or equivalent) SAE 10W-30 API SE, SF, SG classification engine oil.
Engine Oil Capacity:
Approximately 1.5 - 1.7 liters (1.6 - 1.8 US qt) with filter change (refer to manual for exact capacity).
Brake Fluid Type:
DOT 3 or DOT 4 brake fluid.
Final Drive Fluid:
Yamaha Drive Shaft Oil (or equivalent) or SAE 80W-90 hypoid gear oil may be specified for shaft drive (confirm in manual).
Carburetor Clogging:
Common issue with older carbureted vehicles, especially if fuel sits for extended periods. Requires regular cleaning and proper fuel stabilizer use.
Starter Clutch Wear:
Wear on the starter clutch mechanism can lead to the starter motor spinning but not engaging the engine. This is a common wear item.
Electrical Connector Corrosion:
Exposure to elements can cause corrosion in electrical connectors, leading to intermittent faults. Manual provides wiring diagrams for troubleshooting.
Suspension Seal Leaks:
Over time, fork seals and rear shock seals can degrade, leading to oil leaks and reduced damping. Manual details seal replacement.
Drive Shaft Universal Joint:
Wear on U-joints in the driveshaft can cause clunking or vibration. Lubrication and inspection are key, with replacement procedures in the manual.
Manufacturer:
Yamaha Motor Company, a globally recognized leader in powersports and motorcycles.
Moto4 Line:
The Moto-4 line was Yamaha's early offering in the burgeoning ATV market, known for its robust engineering and reliability.
225Cc Positioning:
The 225cc model represented a versatile option within the Moto-4 family, bridging the gap between smaller utility ATVs and larger sport models.
Production Years Covered:
1986, 1987, 1988.
Manufacturing Origin:
Likely manufactured in Japan or other Yamaha global production facilities.
