🏷️ Basic Information

Make:

Yamaha

Model:

YZ85

Year:

2006

Model Code Suffix:

None specified, typically YZ85 for standard models

👋 Introduction

Vehicle Segment:

Competition Motorcycle - Motocross

Target Audience:

Youth motocross riders, mechanics, and workshop technicians.

Key Competitors:

Honda CR85, Kawasaki KX85, Suzuki RM85, KTM 85 SX

Vehicle Focus:

The YZ85 is renowned for its strong performance in the youth motocross class, featuring Yamaha's signature two-stroke power and a capable chassis for competitive racing.

Manual Value Proposition:

This manual is essential for owners and technicians to maintain, diagnose, and repair the 2006 YZ85 to optimal performance standards, ensuring longevity and competitive edge.

📋 Manual Details

Applicable Models:

All 2006 Yamaha YZ85 models

Engine Variants Covered:

Single-cylinder, 2-stroke, liquid-cooled engine specific to the YZ85 platform for 2006.

Estimated Page Count:

300-500 pages (typical for comprehensive workshop manuals of this era and type)

Manual Type:

Workshop Service Repair Manual

Language:

English (implied by product description and common availability)

Format:

Digital Download (PDF)

📖 Manual Coverage

Engine:

Complete disassembly, inspection, repair, and reassembly of the 85cc two-stroke engine, including top-end (cylinder, piston, rings, cylinder head), bottom-end (crankshaft, connecting rod, bearings), lubrication system, cooling system, and exhaust system.

Transmission:

Detailed procedures for clutch operation, gearbox disassembly, inspection, and reassembly, including gear selection mechanism, shift drum, and associated components. Includes gear ratios and maintenance of transmission oil.

Fuel System:

Carburetor (likely Keihin PWK or similar) disassembly, cleaning, adjustment, and troubleshooting. Fuel tank, fuel lines, and fuel filter maintenance.

Ignition System:

CDI ignition system details, stator, flywheel, spark plug specifications, and troubleshooting common ignition issues.

Cooling System:

Radiator, water pump, hoses, thermostat (if applicable), and coolant specifications for the liquid-cooled engine. Bleeding procedures and troubleshooting overheating.

Suspension Front:

Fork disassembly, seal replacement, oil type and level, spring replacement, damper adjustments, and general maintenance of the telescopic front fork system.

Suspension Rear:

Monocross rear suspension system, including shock absorber servicing, linkage maintenance, bearing checks, and spring preload adjustments.

Brakes Front:

Hydraulic disc brake system servicing, including caliper overhaul, piston seals, brake pad replacement, rotor inspection, master cylinder maintenance, and brake fluid specifications and bleeding procedures.

Brakes Rear:

Hydraulic disc brake system servicing, mirroring front brake procedures with specific details for the rear caliper, rotor, master cylinder, and fluid maintenance.

Wheels And Tires:

Wheel bearing maintenance, spoke tensioning, tire inspection, replacement, and recommended tire pressures. Hub maintenance.

Electrical System:

Wiring diagrams, lighting system (headlight, taillight), kill switch, basic DC circuits, and troubleshooting of electrical faults.

Frame And Bodywork:

Frame inspection, sub-frame maintenance, handlebar and control lever replacement, seat removal, fuel tank removal and installation, fender and plastic component servicing.

Scheduled Maintenance:

Detailed service intervals for oil changes, filter cleaning/replacement, spark plug checks, chain adjustment, brake inspections, and general lubrication.

Troubleshooting:

Systematic diagnostic procedures for common issues such as starting problems, poor engine performance, clutch slippage, braking system faults, and suspension issues, often presented in a 'Problem -> Possible Cause -> Solution' format.

Engine Rebuild:

Comprehensive instructions for full engine teardown, including cylinder head removal, piston replacement, connecting rod and crankshaft bearing replacement, and cylinder hone or replacement.

Suspension Rebuild:

Step-by-step guides for rebuilding front forks and rear shock absorbers, including seal and bushing replacement, oil changes, and charging (if applicable).

Brake System Service:

Procedures for bleeding brakes, replacing brake pads and rotors, caliper overhaul, and master cylinder service.

Carburetor Adjustment:

Detailed instructions for setting idle speed, air-fuel mixture, and jetting recommendations for various conditions.

Electrical Diagnostics:

Guidance on using multimeters for testing electrical components and diagnosing wiring issues.

Depth Of Information:

Comprehensive, covering everything from basic pre-ride checks and routine maintenance to complete engine and suspension rebuilds, advanced diagnostics, and detailed specifications.

Specifications Included:

All critical torque specifications, clearance measurements, fluid capacities, fluid types, electrical system voltages, and diagnostic parameters.

Diagrams And Illustrations:

Includes exploded view diagrams for component identification and assembly, wiring diagrams, and numerous step-by-step photographic or line-art illustrations for complex procedures.

📊 Manual Specifications

File Format:

PDF

Searchable Text:

Yes (typically PDF manuals are searchable, allowing quick access to specific information)

Print Quality:

High-resolution for clear text and diagrams, suitable for printing.

Binding Type:

N/A (Digital Download)

Paper Type:

N/A (Digital Download)

⚙️ Engine Specifications

Engine Type:

Liquid-cooled, 2-stroke, Reed Valve

Bore X Stroke:

47.5 mm x 47.8 mm

Displacement:

84.7 cc

Compression Ratio:

8.6:1 (when TDC is 1.0 mm)

Cylinder Design:

Aluminum cylinder with NIKASIL-plated liner

Carburetor Model:

Keihin PWK38S (38mm)

Horsepower Est:

Approx. 20-24 HP (at crankshaft, varies with tuning)

Torque Est:

Approx. 9-11 lb-ft (at crankshaft, varies with tuning)

Fuel Type:

Unleaded gasoline (91 octane or higher recommended)

Fuel Mixture:

Pre-mix: 20:1 ratio (Gasoline: Yamalube 2-stroke oil or equivalent)

Oil Type 2 Stroke:

Yamalube 2-stroke Oil or equivalent premium 2-stroke racing oil

🔧 Transmission

Transmission Type:

Constant mesh, 6-speed

Clutch Type:

Wet, multiple-disc, cable-actuated

Gear Ratios:

1st: 2.167 (32/15), 2nd: 1.706 (29/17), 3rd: 1.350 (27/20), 4th: 1.130 (26/23), 5th: 0.957 (22/23), 6th: 0.840 (21/25)

Final Drive:

Chain drive (428 size), manual adjustment

Transmission Oil Type:

Yamalube Gear Oil (GL-4) SAE 80 or equivalent

Transmission Oil Capacity:

Approx. 650 ml (0.69 US qt)

📐 Dimensions

Overall Length:

1835 mm (72.2 in)

Overall Width:

740 mm (29.1 in)

Overall Height:

1145 mm (45.1 in)

Seat Height:

856 mm (33.7 in)

Wheelbase:

1275 mm (50.2 in)

Dry Weight:

73 kg (161 lbs)

Fuel Tank Capacity:

5.0 L (1.3 US gal)

Oil Tank Capacity:

1.3 L (1.4 US qt) (for 2-stroke oil injection, not applicable for premix models which rely on tank mixing)

🛡️ Safety Features

Safety Ratings:

Not applicable for competition motorcycles in this class; safety is primarily rider-dependent and relies on proper protective gear.

Braking System:

Powerful hydraulic disc brakes front and rear offer significant stopping power for competitive riding.

Suspension System:

Advanced suspension components (Kayaba forks, Monocross rear shock) provide stability and control, crucial for rider safety during aggressive maneuvers.

Chassis Design:

Strong, lightweight aluminum frame designed for rigidity and handling precision.

Ergonomics:

Designed for rider control and comfort, allowing for better balance and input during riding.

💡 Technology Features

Infotainment System:

N/A - This is a competition motocross bike, designed for performance, not comfort or entertainment features.

Driver Assistance Features:

N/A - No electronic rider aids or driver assistance features are present on this model.

Connectivity Features:

N/A - No connectivity features are present.

🔧 Maintenance

Oil Change Transmission:

Every 15-20 hours of operation or annually, whichever comes first.

Spark Plug Inspection:

Every 10-15 hours of operation.

Air Filter Cleaning:

After every few rides, or more frequently in dusty conditions.

Chain Adjustment Lubrication:

Every 5-10 hours of operation or as needed.

Top End Rebuild:

Recommended every 40-60 hours of aggressive use (piston and rings); cylinder and crank bearings as indicated by inspection.

Fork Oil Type:

Yamalube Fork Oil 01 (SAE 5W) or equivalent (specific viscosity and quantity detailed in manual)

Brake Fluid Type:

DOT 4 hydraulic brake fluid (e.g., Yamalube Brake Fluid DOT 4)

Common Wear Items:

Piston rings, clutch plates, wheel bearings, swingarm bearings, steering head bearings, brake pads, chain and sprockets are common wear items requiring regular inspection and replacement.

Potential Problems:

Carburetor jetting can be sensitive to altitude and temperature changes. Overheating can occur if the cooling system is not maintained. Premature wear of the power valve mechanism if not properly cleaned and lubricated.

📚 Vehicle History

Brand History:

Yamaha has a long and successful history in motorsports, particularly in motocross, with a strong reputation for innovation and performance dating back to the 1970s.

Yz85 Lineage:

The YZ85 is a direct descendant of Yamaha's highly successful YZ line, building upon decades of motocross engineering. The 2006 model represents a refinement of the platform, typically featuring chassis updates and engine tuning improvements from previous generations.

Manufacturing Location:

Typically manufactured in Japan by Yamaha Motor Company.

Production Period:

The YZ85 has been in continuous production for many years, with the 2006 model being part of its evolution through the early to mid-2000s.

🏆 Awards & Recognition

Motocross Class Performance:

The Yamaha YZ85 is consistently recognized as a top performer in its class, often praised for its potent engine and agile handling, making it a popular choice for amateur racers and a benchmark for competitors.

Performance Reviews:

Contemporary reviews of the 2006 YZ85 typically highlight its strong mid-range and top-end power delivery, well-balanced chassis, and effective suspension, contributing to its competitive success.

Emissions Certification:

N/A - As a competition-only off-road vehicle, it is not subject to typical road-legal emissions standards or certifications.