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Year
2023
Year
2023
Parent Company
KTM
Parent Company
KTM
Generic Type (Primary)
Sport
Generic Type (Primary)
Youth
Make
KTM
Make
KTM
Display Name
Duke 390
Display Name
SX 50
Manufacturer Country
Austria
Manufacturer Country
Austria
Introduction Year
2015
Introduction Year
-
Manufacturer Recommend Minimum Age
16
Manufacturer Recommend Minimum Age
4
Photo Gallery
Standard
Photo Gallery
Standard
Price
Standard
Price
Standard
MSRP
$5,899
MSRP
$4,699
Destination Charge
555
Destination Charge
385
Warranty (Months/Condition)
24 / Limited
Warranty (Months/Condition)
1 / Limited
Basic Warranty (Miles/Kilometers)
24000 / 38624
Basic Warranty (Miles/Kilometers)
-
Engine
Standard
Engine
Standard
Engine Type
Single-Cylinder
Engine Type
Single-Cylinder
Cylinders
1
Cylinders
1
Engine Stroke
4-Stroke
Engine Stroke
2-Stroke
Cooling
Liquid
Cooling
Liquid
Valves
4
Valves
-
Valves Per Cylinder
4
Valves Per Cylinder
-
Valve Configuration
DOHC
Valve Configuration
Reed Valve
Compression Ratio
12.9:1
Compression Ratio
-
Starter
Electric
Starter
Kick
Fuel Type
Gas
Fuel Type
Gas / Oil Premix
Fuel Requirements
Premium
Fuel Requirements
Premium
Carburetion
Standard
Carburetion
Standard
Carburetion Brand
Bosch
Carburetion Brand
Dell'Orto
Fuel Injector
Yes
Fuel Injector
No
Carburetor
No
Carburetor
Yes
Carburetion Type
Fuel Injected
Carburetion Type
Carburetor
Horsepower (bhp)
44
Horsepower (bhp)
-
Bore (mm/in)
89 / 3.5
Bore (mm/in)
39.5 / 1.56
Stroke (in/mm)
2.36 / 60
Stroke (in/mm)
1.57 / 40
Displacement (cc/ci)
373 / 22.8
Displacement (cc/ci)
49 / 3
Fuel Injector Size (mm)
46
Fuel Injector Size (mm)
-
Number Of Carburetors
-
Number Of Carburetors
1
Parental Controls
-
Parental Controls
Standard
Speed Governor
-
Speed Governor
Yes
Carburetor Size (mm)
-
Carburetor Size (mm)
19
Transmission
Standard
Transmission
Standard
Transmission Type
Manual
Transmission Type
Automatic
Number Of Speeds
6
Number Of Speeds
1
Overdrive
Yes
Overdrive
-
Reverse
No
Reverse
No
Final Drive Ratio
2.67
Final Drive Ratio
3.64
Primary Drive (Rear Wheel)
Chain
Primary Drive (Rear Wheel)
Chain
Dimensions
Standard
Dimensions
Standard
Weight
Standard
Weight
Standard
Capacities
Standard
Capacities
Standard
Performance
Standard
Performance
Standard
Wheelbase (in/mm)
53.4 / 1357
Wheelbase (in/mm)
40.6 / 1032
Ground Clearance (in/mm)
7.3 / 185
Ground Clearance (in/mm)
9.9 / 252
Dry Weight (lbs/kg)
328.5 / 149
Dry Weight (lbs/kg)
91.5 / 41.5
Fuel Capacity (gal/l)
3.5 / 13.4
Fuel Capacity (gal/l)
0.6 / 2.3
Fuel Capacity Reserve (gal/l)
0.4 / 1.5
Fuel Capacity Reserve (gal/l)
-
Engine Displacement to Weight (cc)
1.14
Engine Displacement to Weight (cc)
0.54
Construction
Standard
Construction
Standard
Frame
Steel
Frame
Chromium Molybdenum
Body Material
Steel
Body Material
Plastic
Foot Pegs
Standard
Foot Pegs
Standard
Foot Peg Location
Driver and Passenger
Foot Peg Location
Driver
Hand Grips
Standard
Hand Grips
Standard
Handlebars
Standard
Handlebars
Standard
Exterior Guards
Standard
Exterior Guards
Standard
Belt Guard
No
Belt Guard
No
Brush Guard
No
Brush Guard
No
Chain Guard
Yes
Chain Guard
-
Drive Shaft Guard
No
Drive Shaft Guard
No
Engine Case Guard
No
Engine Case Guard
No
Exhaust Guard
Yes
Exhaust Guard
Yes
Fork Guards
Yes
Fork Guards
Yes
Hand Guards
No
Hand Guards
No
Heel Guards
No
Heel Guards
-
Light Guard
No
Light Guard
No
Saddle Bag Guard
No
Saddle Bag Guard
No
Exterior Covers
Standard
Exterior Covers
Standard
Front Fender
Standard
Front Fender
Standard
Rear Fender
Standard
Rear Fender
Standard
Stand
Standard
Stand
Standard
Stand Type
Kick
Stand Type
Kick
Skid Plate
Standard
Skid Plate
Optional
Handlebar Pads
-
Handlebar Pads
Standard
Chassis Protectors
-
Chassis Protectors
No
Fuel Tank Cover
-
Fuel Tank Cover
No
Side Cover
-
Side Cover
No
Steering Control
Handlebar
Steering Control
Handlebar
Front Suspension Brand Name
WP APEX
Front Suspension Brand Name
WP XACT
Front Suspension Type
Inverted Fork
Front Suspension Type
Inverted Fork
Front Adjustable Fork Pre-Load
Yes
Front Adjustable Fork Pre-Load
Yes
Front Adjustable Rebound Damping
Yes
Front Adjustable Rebound Damping
Yes
Front Central Suspension Strut
No
Front Central Suspension Strut
No
Rear Suspension Brand Name
WP APEX
Rear Suspension Brand Name
WP XACT
Rear Suspension Type
Twin Sided Swing Arm
Rear Suspension Type
Twin Sided Swing Arm
Rear Suspension Material
Aluminum
Rear Suspension Material
Aluminum
Rear Adjustable Shock / Spring Pre-Load
Yes
Rear Adjustable Shock / Spring Pre-Load
Yes
Rear Adjustable Rebound Damping
Yes
Rear Adjustable Rebound Damping
Yes
Number Rear Shock Absorbers
1
Number Rear Shock Absorbers
1
Air Adjustable
No
Air Adjustable
No
Front Suspension Size (in/mm)
1.7 / 43
Front Suspension Size (in/mm)
1.3 / 35
Front Travel (in/mm)
5.6 / 142
Front Travel (in/mm)
8.1 / 205
Rear Travel (in/mm)
5.9 / 150
Rear Travel (in/mm)
7.3 / 185
Steering Damper
-
Steering Damper
No
Wheels
Standard
Wheels
Standard
Wheels Composition
Aluminum
Wheels Composition
Aluminum
Chromed
No
Chromed
-
Tube / Tubeless
Tubeless
Tube / Tubeless
Tubed
Tires
Standard
Tires
Standard
Tire Brand
Metzeler
Tire Brand
Maxxis®
Front Tire Width
110
Front Tire Width
-
Front Tire Aspect Ratio
70
Front Tire Aspect Ratio
-
Front Tire Speed Rating
H
Front Tire Speed Rating
J
Front Wheel Diameter
17
Front Wheel Diameter
12
Rear Tire Width
150
Rear Tire Width
-
Rear Tire Aspect Ratio
60
Rear Tire Aspect Ratio
-
Rear Tire Speed Rating
H
Rear Tire Speed Rating
J
Rear Wheel Diameter
17
Rear Wheel Diameter
10
Front Wheel Width (in)
3
Front Wheel Width (in)
2.5
Rear Wheel Width (in)
4
Rear Wheel Width (in)
2.75
Front Tire (Full Spec)
Metzeler 110/70 ZR17 54H
Front Tire (Full Spec)
Maxxis® MX-ST 2.50 X 12 42J
Rear Tire (Full Spec)
Metzeler 150/60 ZR17 66H
Rear Tire (Full Spec)
Maxxis® MX-ST 2.75 X 10 38J
Brakes
Standard
Brakes
Standard
Brake Brand Name
ByBre
Brake Brand Name
Formula
Front Brake Type
Disc
Front Brake Type
Hydraulic Disc
Rear Brake Type
Disc
Rear Brake Type
Hydraulic Disc
Anti-Lock Brakes
Standard
Anti-Lock Brakes
-
Linked Brake System Front to Rear
Standard
Linked Brake System Front to Rear
-
Front Brake Diameter (in/mm)
12.6 / 320
Front Brake Diameter (in/mm)
6.3 / 160
Rear Brake Diameter (in/mm)
9.1 / 230
Rear Brake Diameter (in/mm)
6.3 / 160
Seat Type
Two-Piece
Seat Type
One-Piece
Seat Location
Driver and Passenger
Seat Location
Driver
Seat Material
Vinyl
Seat Material
Vinyl
Adjustable
No
Adjustable
Yes
Folding
No
Folding
No
Seat Specifications
Standard
Seat Specifications
Standard
Number Of Seats
2
Number Of Seats
1
Grab Rail or Strap
Standard
Grab Rail or Strap
-
Seat Height (in/mm)
32.3 / 820
Seat Height (in/mm)
26.2 / 665
Digital Instrumentation
Standard
Digital Instrumentation
Optional
Clock
Standard
Clock
-
Speedometer
Standard
Speedometer
-
Tachometer
Standard
Tachometer
Optional
Trip Odometer
Standard
Trip Odometer
-
Trip Computer
Standard
Trip Computer
-
Fuel Level Warning
Standard
Fuel Level Warning
-
Fuel Level Warning Type
Gauge
Fuel Level Warning Type
-
Temperature Warning
Standard
Temperature Warning
-
Temperature Warning Type
Gauge
Temperature Warning Type
-
Shift Light
Standard
Shift Light
-
Service Reminder
Standard
Service Reminder
-
Multi-Lingual Instrumentation
Standard
Multi-Lingual Instrumentation
-
Lap Timer
-
Lap Timer
Optional
Type
LED
Type
-
Headlight (s)
Standard
Headlight (s)
-
Rearview Mirrors
Standard
Rearview Mirrors
-
Engine Immobilizer
Standard
Engine Immobilizer
-
Adjustable Levers
Standard
Adjustable Levers
-
Tool Bag Mount
Standard
Tool Bag Mount
-
Paint
Standard
Paint
Standard
Metallic
No
Metallic
No
Decal Kit
Standard
Decal Kit
Standard
Storage Cover
-
Storage Cover
Optional