Category:
Mini Motocross Bike
Target Audience:
Young motocross racers, trail riders, and performance enthusiasts.
Competitors:
Kawasaki KX85, Yamaha YZ85, KTM 85 SX.
Performance Focus:
Designed for aggressive racing and spirited riding with a potent two-stroke engine and agile handling.
Durability:
Known for Suzuki's reputation for robust construction and reliability in competitive environments.
Tunability:
Excellent platform for tuning and modification to optimize performance for specific rider needs and track conditions.
Engine:
Full engine overhaul, top-end and bottom-end rebuilds, carburetor tuning, cooling system, lubrication system.
Transmission:
Clutch operation and adjustment, gearbox disassembly and reassembly, gearshift mechanism.
Chassis:
Frame inspection and repair, suspension fork (front) disassembly, service, and reassembly, rear shock absorber inspection and service, swingarm and linkage maintenance.
Brakes:
Front and rear brake system maintenance, hydraulic caliper service, brake pad replacement, bleeding procedures.
Electrical:
Ignition system, wiring diagrams, lighting, kill switch, basic troubleshooting.
Fuel System:
Fuel tank maintenance, fuel line inspection, carburetor overhaul (Keihin PE28/29 typically).
Cooling System:
Radiator inspection, coolant checks, hose replacement.
Maintenance:
Regular service checks, lubrication points, filter replacements, chain adjustment, spark plug replacement.
Troubleshooting:
Diagnostic procedures for common performance issues, starting problems, and operational faults.
Repair:
Step-by-step repair instructions for all major components and systems.
Rebuild:
Complete engine and transmission rebuild procedures with detailed specifications.
Installation:
Guidance on installing aftermarket parts or replacement components.
Depth Level:
Comprehensive: Covers everything from basic rider maintenance to full engine and chassis rebuilds.
Diagnostic Capabilities:
Detailed diagnostic information, including common issues, symptoms, and corrective actions.
Special Tools:
Lists and descriptions of specialized tools required for specific repair procedures.
Torque Specifications:
Precise torque values for all critical fasteners and bolts.
Clearances And Tolerances:
Specific measurements for engine component clearances, bearing tolerances, and critical clearances.
File Type:
PDF (Portable Document Format)
Searchability:
Likely text-searchable PDF for easy information retrieval.
Resolution:
High resolution for clear display and printing of diagrams and text.
Binding:
Not Applicable (Digital Format)
Paper:
Not Applicable (Digital Format)
Engine Type:
Liquid-cooled, 2-stroke, reed-valve, single-cylinder
Bore X Stroke:
48.0 mm x 46.8 mm
Cylinder Design:
SCEM (Suzuki Composite Electrochemical Material) plated cylinder for improved durability and heat dissipation.
Horsepower Approx:
Typically in the range of 20-25 HP (varies with tuning and specific model year updates).
Torque Approx:
Specific torque figures not always published for this class, but strong mid-range power delivery.
Carburetor Model:
Keihin PE28 or PE29 (specific to model year and region).
Fuel Type:
Unleaded gasoline
Fuel Mixture:
Requires pre-mix of gasoline and 2-stroke oil (specific ratio detailed in manual).
Air Cleaner:
Removable, washable foam air filter.
Oil Type:
High-quality 2-stroke engine oil, specifically formulated for high-performance air-cooled or liquid-cooled engines.
Oil Mixing Ratio:
Typically 20:1 or 32:1 (check manual for exact specification).
Ignition System:
Digital CDI (Capacitor Discharge Ignition)
Spark Plug Type:
NGK BR9EG or equivalent (standard recommendation).
Cooling Method:
Liquid-cooled
Coolant Type:
Mixture of distilled water and permanent antifreeze (ethylene glycol based).
Coolant Capacity:
Approx. 0.6 Liters (refer to manual for exact capacity).
Transmission Type:
Constant mesh, 6-speed sequential
Clutch Type:
Wet, multi-plate
Clutch Operation:
Cable-actuated
Gear Ratios:
Specific ratios detailed in the manual for each gear.
Final Drive:
Chain drive (sprocket sizes typically 13T front, 48-50T rear depending on setup).
Transmission Oil Capacity:
Approx. 0.8 Liters (refer to manual for exact specification and type).
Transmission Oil Type:
API GL-4 or GL-5, SAE 80W or 10W-30 gear oil (check manual for precise recommendation).
Overall Length:
Approx. 1770 mm (subject to minor variations)
Overall Width:
Approx. 765 mm (subject to minor variations)
Overall Height:
Approx. 1160 mm (subject to minor variations)
Wheelbase:
Approx. 1240 mm (subject to minor variations)
Ground Clearance:
Approx. 325 mm (subject to minor variations)
Seat Height:
Approx. 850 mm (subject to minor variations)
Dry Weight:
Approx. 72 kg (subject to minor variations)
Curb Weight:
Not typically specified for competition bikes, but effectively dry weight + fluids.
Fuel Tank Capacity:
Approx. 5.0 Liters
Front Tire Size:
60/100-17 33M
Rear Tire Size:
80/100-14 49M
Wheel Type:
Spoked wheels
Brake System Front:
Hydraulic disc brake
Brake System Rear:
Hydraulic disc brake
Safety Certification:
Not applicable (Competition off-road vehicle, not street legal).
Braking Performance:
Designed for effective and responsive braking in off-road conditions.
Suspension Stability:
High-quality suspension system (Showa or similar) designed for stability and control over rough terrain.
Frame Design:
Durable steel frame designed to withstand the rigors of motocross racing.
Ergonomics:
Designed for rider control and comfort during aggressive riding.
Oil Change Interval:
Every 10-15 hours of hard riding or as specified in the manual.
Air Filter Cleaning:
After every few rides, or more frequently in dusty conditions.
Spark Plug Inspection:
Every 10-20 hours of riding.
Chain And Sprockets Maintenance:
Clean and lubricate every 5-10 hours of riding, adjust tension as needed.
Top End Rebuild Interval:
Highly dependent on usage, typically 30-60 hours for competitive racing.
Bottom End Rebuild Interval:
Significantly longer than top-end, often 100+ hours or when wear is detected.
Brake Fluid Type:
DOT 4 hydraulic brake fluid.
Fork Oil Type:
Specific suspension fork oil (e.g., Showa SS-8 or equivalent 5W/7.5W fork oil) as specified in the manual.
Coolant Specification:
50/50 mixture of distilled water and ethylene glycol-based antifreeze.
Common Wear Items:
Clutch plates, piston rings, spark plugs, chain and sprockets, brake pads, wheel bearings.
Carburetor Tuning Sensitivity:
Highly sensitive to altitude, temperature, and humidity; requires frequent jetting adjustments.
Suspension Maintenance:
Regular fork oil changes and seal checks are crucial for optimal performance.
Engine Performance Loss:
Can be attributed to worn piston rings, reed valves, incorrect jetting, or exhaust carbon buildup.
Manufacturer Legacy:
Suzuki has a long and successful history in motorcycle racing, particularly in motocross and Grand Prix racing, known for innovative engine technology and competitive chassis design.
Rm Series Lineage:
The RM85 is part of Suzuki's esteemed RM line of motocross bikes, which has been a dominant force in the junior and amateur racing classes for decades, evolving from earlier RM75/80 models.
K9 Generation Updates:
The K9 designation signifies a specific model year update, often including minor refinements in suspension tuning, graphics, or carburetor jetting to maintain competitiveness.
Manufacturing Origin:
Japan (Primary manufacturing location for Suzuki motorcycles).
Class Dominance:
The RM85 has consistently been a top contender and race-winner in the 85cc class across various amateur and professional racing organizations globally.
Editor Reviews:
Consistently praised by motorcycle media for its powerful engine, nimble handling, and robust chassis.
Racing Homologation:
Meets specifications for most major motocross racing series in its class.
