Target Audience:
Young racers and their teams; parents and service technicians maintaining youth-class motocross bikes
Competitive Advantage:
KTM's 65 SX class-leading water-cooled two-stroke power, liquid cooling on a youth bike, and lightweight chromoly steel frame versus air-cooled rivals
Key Features:
Liquid-cooled 65cc two-stroke engine, 6-speed gearbox, WP suspension components front and rear, hydraulic disc brakes
Engine:
Cylinder, piston, cylinder head, crankshaft, crankcase assemblies
Cooling System:
Radiator, water pump, hoses, coolant components
Carburetor:
Carburetor body, jets, throttle assembly, intake components
Clutch:
Clutch basket, plates, springs, actuation components
Transmission:
6-speed gear set, shift forks, shift drum, shift mechanism
Ignition:
Ignition stator, CDI components, spark plug, flywheel
Frame and Bodywork:
Frame, subframe, seat, fenders, side covers, number plate
Wheels and Brakes:
Front and rear hubs, spokes, rims, brake discs, calipers, master cylinders
Suspension:
WP telescopic front fork and rear shock components and linkage
Exhaust:
Expansion chamber, silencer, springs and mounting hardware
Controls:
Handlebar, levers, cables, footpegs, kickstarter
Electrical:
Wiring harness, switches, lighting connectors
Fasteners and Hardware:
Screws, nuts, washers, bearings and seals with OEM part numbers
Technical Depth:
Exploded-view diagrams with OEM part references for accurate parts identification and ordering
Parts Information:
Genuine KTM part numbers and quantities per assembly
Format Features:
Indexed sections and part listing tables for quick lookup
Scope Note:
Parts catalog only; service procedures are covered in the separate service/repair manual
File Format:
PDF (searchable, bookmarked, zoomable)
Compatibility:
Windows, macOS, Linux, iOS, and Android — any device with a PDF reader
Requirements:
A PDF reader application (e.g. Adobe Acrobat Reader, free)
Searchability:
Fully text searchable for fast lookup of any topic
Print Quality:
High-resolution digital pages, printable at full clarity
Binding Type:
N/A — digital download, no physical binding
Paper Type:
N/A — digital download, no physical paper
Engine Type:
Single-cylinder 2-stroke, liquid-cooled
Bore and Stroke:
Approximately 45 mm x 41 mm
Carburetor:
Dellorto PHBN 28 or equivalent
Ignition:
Contactless CDI ignition
Cooling:
Liquid-cooled with radiator and water pump
Lubrication:
Premix (oil mixed with fuel)
Wheelbase:
Approximately 1,140 mm (44.9 in)
Overall Length:
N/A - not specified
Ground Clearance:
Approximately 265 mm (10.4 in)
Seat Height:
Approximately 750 mm (29.5 in)
Fuel Capacity:
Approximately 5.5 liters (1.5 gal)
Curb Weight (dry weight approx.):
Approximately 55 kg (122 lb)
Crash Test Rating:
N/A - not applicable for off-road competition motorcycles
Front Brake:
Hydraulic single disc brake
Rear Brake:
Hydraulic single disc brake
Passive Features:
Chain guard, footpegs, kill switch on handlebar
Active Features:
N/A - no electronic rider aids; rider protection depends on proper riding gear
Audio System:
N/A - off-road motorcycle, no audio equipment
Instrumentation:
N/A - no instrument cluster on this model
Ignition Technology:
Digital CDI ignition for reliable spark
Driver Assistance:
N/A - no electronic rider aids fitted
Engine Oil (premix):
2-stroke oil mixed with fuel per KTM recommendation (typical 1:50 to 1:60 ratio)
Coolant:
Long-life antifreeze/coolant suitable for aluminum engines
Chain Maintenance:
Regular chain cleaning, lubrication, and slack adjustment
Common Wear Items:
Piston and rings, clutch plates, brake pads, chain and sprockets, reed valves, fork seals
Known Issues:
2-stroke top-end wear requires periodic piston inspection; cooling system should be bled after coolant changes
Service Intervals:
N/A - refer to KTM service manual schedule for this model year
Manufacturer:
KTM, Mattighofen, Austria
Model Evolution:
The 65 SX evolved from KTM's 65cc youth motocross line, bringing liquid cooling, a 6-speed gearbox, and WP suspension to the junior class
Production Location:
Austria
