Segment:
        
        
            Youth Motocross / Mini Bike
        
     
    
        
            Purpose:
        
        
            Designed for competitive junior motocross racing, offering performance and durability.
        
     
    
    
        
            Key Competitors:
        
        
            Yamaha YZ65, Honda CR65 (historically), Suzuki RM65 (historically), Kawasaki KX65.
        
     
    
    
        
            Frame Design:
        
        
            Chromium-molybdenum steel frame for strength and rigidity.
        
     
    
        
            Suspension Brand:
        
        
            WP Suspension (high-quality components for youth racing).
        
     
    
        
            Engine Type:
        
        
            Liquid-cooled, two-stroke single-cylinder.
        
     
    
        
            Clutch Type:
        
        
            Hydraulic clutch actuation (a premium feature for this class).
        
     
 
    
    
    
        
            Engine:
        
        
            Complete engine overhaul, disassembly, assembly, tuning, lubrication, cooling system.
        
     
    
        
            Fuel System:
        
        
            Carburetor identification, adjustment, cleaning, fuel pump (if applicable), fuel lines.
        
     
    
        
            Ignition System:
        
        
            Spark plug specifications, timing, coil testing, CDI unit diagnostics.
        
     
    
        
            Transmission:
        
        
            Clutch operation, gear shifting mechanism, gearbox lubrication, disassembly and reassembly.
        
     
    
        
            Suspension:
        
        
            Front forks (WP Suspension), rear shock absorber, linkage systems, adjustment, service, and overhaul.
        
     
    
        
            Brakes:
        
        
            Hydraulic brake systems (front and rear), caliper service, brake pad replacement, fluid specifications, bleeding procedures.
        
     
    
        
            Cooling System:
        
        
            Radiator, hoses, coolant specifications, bleeding procedures.
        
     
    
        
            Electrical System:
        
        
            Wiring diagrams, lighting, battery maintenance, fuse identification, troubleshooting electrical faults.
        
     
    
        
            Chassis And Frame:
        
        
            Frame inspection, steering head bearing service, swingarm maintenance, axle inspection.
        
     
    
        
            Bodywork And Trim:
        
        
            Plastic panel removal and installation, seat maintenance, handlebar and control adjustments.
        
     
    
    
        
            Maintenance:
        
        
            Scheduled maintenance, pre-ride checks, cleaning, lubrication schedules, filter replacement.
        
     
    
        
            Troubleshooting:
        
        
            Step-by-step diagnostic procedures for common operational issues.
        
     
    
        
            Repair:
        
        
            Detailed instructions for component repair and replacement.
        
     
    
        
            Disassembly:
        
        
            Comprehensive breakdown of all major vehicle systems.
        
     
    
        
            Assembly:
        
        
            Detailed reassembly procedures with torque specifications.
        
     
    
        
            Cleaning:
        
        
            Specific cleaning instructions for various components.
        
     
    
        
            Reinstallation:
        
        
            Proper methods for reinstalling components.
        
     
    
    
        
            Depth:
        
        
            Factory-level detail, covering all aspects from basic maintenance to complete engine rebuilds.
        
     
 
    
    
    
        
            Type:
        
        
            Two-stroke, single-cylinder, liquid-cooled
        
     
    
        
            Displacement 60Sx:
        
        
            ~50cc - 60cc range (specifics vary)
        
     
    
    
        
            Bore X Stroke 65Sx:
        
        
            43.0 mm x 43.0 mm (typical for 65cc 2-strokes)
        
     
    
    
        
            Horsepower 65Sx:
        
        
            Estimated 16-18 HP (factory tuned)
        
     
    
        
            Torque 65Sx:
        
        
            Not typically advertised for youth models, but significant for its displacement.
        
     
    
    
        
            Carburetor 65Sx:
        
        
            Keihin PWK 28 (common for performance 65cc engines)
        
     
    
        
            Fuel Type:
        
        
            Unleaded gasoline (91 octane or higher recommended), mixed with 2-stroke oil
        
     
    
        
            Fuel Mixture Ratio:
        
        
            Typically 50:1 with high-quality 2-stroke oil (refer to manual for specific oil type).
        
     
 
    
    
    
        
            Safety Focus:
        
        
            Primarily designed for off-road racing; safety features focus on rider control and machine stability.
        
     
    
    
        
            Brakes:
        
        
            Hydraulic disc brakes (front and rear) for effective stopping power.
        
     
    
        
            Suspension Tuning:
        
        
            Adjustable suspension allows tuning for rider weight and track conditions, enhancing control.
        
     
    
    
        
            Frame Construction:
        
        
            Robust frame design to withstand racing stresses.
        
     
    
        
            Handlebars:
        
        
            High-quality handlebars with appropriate bend for rider ergonomics.
        
     
 
    
    
    
        
            Oil Change Engine:
        
        
            Regularly check transmission oil level and change as per manual recommendation (typically every 10-20 hours of riding).
        
     
    
        
            Air Filter Cleaning:
        
        
            Frequent cleaning/replacement recommended, especially in dusty conditions (every 2-5 hours of riding).
        
     
    
        
            Spark Plug Replacement:
        
        
            Recommended every 20-30 hours of riding, or as needed based on inspection.
        
     
    
        
            Top End Rebuild:
        
        
            For competitive use, a top-end rebuild (piston, rings, cylinder inspection) is typically recommended every 30-50 hours of riding.
        
     
    
    
        
            Transmission Oil:
        
        
            KTM recommends specific transmission oils for their 2-stroke motocross bikes. Refer to the manual for exact specifications (e.g., Motorex Gear Oil).
        
     
    
        
            Coolant:
        
        
            Pre-mixed, ethylene glycol-based coolant with corrosion inhibitors. Typically a 50/50 mix with distilled water.
        
     
    
        
            Brake Fluid:
        
        
            DOT 4 hydraulic brake fluid.
        
     
    
    
        
            Carburetor Jetting:
        
        
            Proper carburetor jetting is critical for optimal performance and engine longevity; variations in altitude and temperature require adjustments.
        
     
    
        
            Clutch Wear:
        
        
            Clutch plates can wear over time with aggressive use; proper adjustment and replacement are key.
        
     
    
        
            Suspension Seals:
        
        
            Fork and shock seals can leak, requiring replacement to maintain suspension performance.
        
     
 
    
    
    
        
            Ktm Motorsport:
        
        
            KTM has a long and successful history in off-road and motocross racing across all age groups.
        
     
    
    
        
            Development:
        
        
            The 65 SX and its predecessors have been developed specifically for the junior motocross racing scene, with continuous improvements in engine performance, suspension, and chassis.
        
     
    
    
        
            Manufacturing:
        
        
            KTM motorcycles are typically manufactured in Austria.