🏷️ Basic Information

Make:

Yamaha

Model:

YZ85

Year:

2007

Category:

Motocross Motorcycle

Engine Code:

Not specified in product info, typically identified by VIN

Chassis Code:

Not specified in product info, typically identified by VIN

👋 Introduction

Market Segment:

Entry-level to intermediate motocross competition, youth performance dirt bike segment.

Key Competitors 2007:

KTM 85 SX, Suzuki RM85, Honda CR85R, Kawasaki KX85

Vehicle Key Features:

Lightweight chassis, potent two-stroke engine, capable suspension, race-oriented design, proven performance in its class.

Manual Benefit:

Empowers owners and technicians with comprehensive, illustrated, step-by-step guidance for maintenance, repair, and troubleshooting, maximizing the performance and longevity of the Yamaha YZ85.

📋 Manual Details

Systems Covered:

Engine, Transmission, Clutch, Cooling System, Fuel System, Ignition System, Chassis, Suspension (Front & Rear), Brakes (Front & Rear), Electrical System, Wheels, Tires, Steering, Bodywork, Troubleshooting, Maintenance

Page Count:

Not specified, but described as 'detailed file' and 'illustrated with clear step-by-step instructions'

Manual Type:

Repair Service Workshop Manual

Language:

English (assumed based on typical product listings and description)

Format:

Downloadable Digital File (PDF likely)

📖 Manual Coverage

Engine Systems:

Complete engine disassembly and reassembly, cylinder head, cylinder, piston, crankshaft, connecting rod, lubrication system, cooling system (radiator, water pump), fuel system (carburetor, fuel pump, fuel lines), exhaust system

Transmission Systems:

Gearbox disassembly and reassembly, clutch operation and maintenance, gear selection mechanism, lubrication

Chassis Systems:

Frame inspection, suspension fork service and adjustment, rear shock absorber service and adjustment, steering head bearing maintenance, swingarm and linkage lubrication and service, wheel bearing replacement, spoke tensioning

Brake Systems:

Front and rear hydraulic brake system service, brake caliper overhaul, master cylinder service, brake pad replacement, brake fluid bleeding and replacement, brake hose inspection

Electrical Systems:

Ignition system troubleshooting, spark plug inspection and replacement, lighting system (if applicable), wiring diagrams, battery maintenance

Maintenance Procedures:

Regular service intervals, oil changes, filter replacement, chain adjustment, lubrication points, brake adjustments, tire pressure checks, pre-ride inspections, post-race inspections

Repair Procedures:

Engine rebuilds, top-end overhauls, gearbox repairs, suspension overhauls, brake system repairs, electrical diagnostics and repair, body panel replacement

Troubleshooting Guides:

Diagnostic charts for common problems, symptom-based troubleshooting for engine, electrical, and chassis issues

Depth Of Coverage:

Comprehensive, covering complete disassembly, inspection, repair, and reassembly of all major motorcycle systems. Suitable for intermediate to advanced mechanics, as well as dedicated enthusiasts. Includes detailed specifications and torque values.

📊 Manual Specifications

File Format:

Digital Download (Likely PDF)

Print Quality:

High Quality, Printable from any computer. 'Made in very best quality.'

Binding Type:

N/A (Digital)

Paper Type:

N/A (Digital)

⚙️ Engine Specifications

Engine Type:

Liquid-cooled, 2-stroke, reed valve, single-cylinder

Displacement:

85 cc (5.18 cu. in.)

Bore X Stroke:

47.5 mm x 47.8 mm (1.87 in. x 1.88 in.)

Compression Ratio:

9.7:1 (typical for this model, check manual for exact spec)

Horsepower:

Approximately 20-23 HP (varies by source and tuning, manual will provide exact specifications)

Torque:

Not typically quoted for this class, but significant for its displacement.

Carburetor:

Mikuni VM28SS (typical, verify in manual)

Fuel Type:

Unleaded gasoline (91 octane or higher recommended)

Fuel Oil Mixture:

50:1 ratio with high-quality 2-stroke oil (refer to manual for specific oil type and brand recommendations)

Ignition:

CDI (Capacitor Discharge Ignition)

Cooling Method:

Liquid-cooled

🔧 Transmission

Transmission Type:

6-speed constant mesh

Clutch:

Wet, multi-disc

Final Drive:

Chain drive (DID 428VM or similar, check manual for specific chain size and pitch)

Gear Ratios:

Manual will provide specific gear ratios for each of the 6 speeds. Typical ratios are optimized for motocross performance.

Transmission Oil:

Yamalube 10W-30 or equivalent SAE 10W-30 API SG or higher (check manual for exact specification and capacity).

📐 Dimensions

Length:

Approx. 1830 mm (72.0 in.)

Width:

Approx. 770 mm (30.3 in.)

Height:

Approx. 1155 mm (45.5 in.)

Seat Height:

Approx. 845 mm (33.3 in.)

Wheelbase:

Approx. 1240 mm (48.8 in.)

Dry Weight:

Approx. 71 kg (157 lbs.)

Fuel Tank Capacity:

4.5 Liters (1.2 US gal.)

Oil Tank Capacity:

0.48 Liters (0.51 US qt.) for 2-stroke oil

Coolant Capacity:

0.60 Liters (0.63 US qt.)

Front Tire Size:

70/100-17 40M

Rear Tire Size:

90/100-14 49M

Front Wheel:

17 inch

Rear Wheel:

14 inch

Wheelbase Type:

Spoke wheels

🛡️ Safety Features

Safety Ratings:

Not applicable to off-road competition motorcycles in the same way as street vehicles.

Braking System:

Hydraulic disc brakes front and rear for effective stopping power.

Suspension:

Long-travel, adjustable suspension (KYB components typical) for absorbing impacts and maintaining control.

Frame Construction:

Strong, lightweight steel perimeter frame designed for rigidity and handling.

💡 Technology Features

Infotainment Features:

N/A (This is a competition motocross motorcycle; no infotainment systems are present).

Rider Aids:

N/A (Designed for pure performance, no electronic rider aids like traction control or ABS).

🔧 Maintenance

Oil Change Interval:

Refer to manual. Typically every 5-10 hours of riding, or as per manual recommendation for transmission oil.

Air Filter Cleaning:

After every few rides or as needed depending on conditions. Manual will specify cleaning and re-oiling procedure.

Spark Plug Replacement:

Typically recommended every 20-40 hours of riding, or as needed based on condition. NGK BR9EG is a common plug for this model.

Chain Lubrication Tension:

Lubricate chain regularly (every 5-10 hours or after washing/riding in wet conditions). Check and adjust chain tension as per manual's specification (typically 15-25mm of slack).

Brake Fluid Flush:

Recommended every 12 months or as needed. Manual will specify DOT 3 or DOT 4 brake fluid.

Engine Oil Type:

Yamalube 10W-30 or equivalent SAE 10W-30 API SG or higher.

2 Stroke Oil Type:

High-quality 2-stroke premix oil with a 50:1 ratio recommended (e.g., Yamalube 2R, Motul 800 2T)

Coolant Type:

High-quality ethylene glycol-based antifreeze with distilled water (50/50 mix recommended). Refer to manual for specific coolant type.

Common Yz85 Wear Items:

Piston and rings (due to high-revving nature), clutch plates, wheel bearings, chain and sprockets, suspension seals (forks and shock).

Carburetor Tuning Challenges:

Achieving optimal jetting can be crucial for performance across different altitudes and temperatures. Manual will provide detailed carburetor adjustment procedures and specifications.

📚 Vehicle History

Yamaha Motorsport Legacy:

Yamaha has a long and storied history in motocross and off-road racing, dating back to the 1960s. The YZ lineage is one of Yamaha's most successful and respected model lines.

Yz85 Development Points:

The YZ85 has evolved significantly over the years, with key updates focusing on engine power, suspension technology, chassis geometry, and braking performance to remain competitive in the youth motocross class.

Yz85 Production Era:

The YZ85 has been in continuous production for many years, with the 2007 model being part of the second generation of this specific displacement, following the successful YZ80.

🏆 Awards & Recognition

Industry Awards:

The YZ85 line generally receives positive reviews and accolades from motocross publications for its performance and reliability within its class. Specific awards for the 2007 model would be detailed in specialized reviews from that period.