# Aprilia RX/SX 50

The 2006 Aprilia RX/SX 50 is a street/off-road motorcycle widely produced by Aprilia. It is powered by a six-speed, carburetor-fuelled, nikasil-lined and cast iron single-cylinder two-stroke engine manufactured by Derbi/Piaggio.

## Styling and concept

The 2006 Aprilia RX/SX 50s are the renovated successors of the Aprilia RX 50 first produced in 1992; the panels and layout are based closely on the bigger displacement Aprilia RXV/SXVs.

## Engine

The engine in the Aprilia SX 50 is sourced from Derbi/Piaggio (D50B0/D50B1). This engine is used in the Derbi Senda DRD/X-Race/X-Treme supermotos and crossers, as well as the 2006 onwards Derbi GPR 50 and Aprilia RS 50 road bikes, although the road bikes feature an electric starter instead of a kickstarter on the supermotos. Engine parts from the crossers and supermotos can be directly swapped with one another; there are some small differences between the road bike and supermoto engine and frame which may require modification to transfer some external engine parts (exhaust, airbox etc.)

## Specifications
### SX50

50 cc single cylinder, six-petal reed valve case induction and two-stroke injection (automix) carburetor fueled.
    Engine displacement – 49.76 cc
    Bore/stroke – 39,88×40 mm
    Compression ratio – 11.5:1
    Clutch – Wet, multiple plate
    Starting – Kickstart
    Exhaust = Catalytic converter
    Rotor Ignition/Generator = 85w/120w
    Cooling system – Liquid-cooled
    Fuel tank size = 7 litres
    Fuel system – Carburetor Dell'Orto PVHA 17.5 mm
       Main jet = 95
       Needle Jet = A13, notch #2
       Idle jet = 30
    Transmission
       1st = 1st 11/34
       2nd = 2nd 15/30
       3rd = 3rd 18/27
       4th = 4th 20/24
       5th = 5th 22/23
       6th = 6th 23/22
       Primary drive = 21/78
    Sprockets
       Front = 11 Teeth
       Rear = 53 Teeth
       Overall Final Drive ratio = 11/53
    Spark plug = DENSO W27ESR-U/IW27 NGK BR9ES/BR9EG/BR9EIX
       Gap = .6-7 mm
    Wheelbase = 55.354 in (1,406 mm)
    Length = 79.68 in (2,024 mm)
    Width = 80.511 in (2,045 mm)
    Height = 32.677 in (830 mm)
    Tires = Front: 100/80 - 17 inch; Rear: 130/70 - 17-inch

### RX50

50 cc single cylinder, six petal reed valve case induction and two-stroke injection (automix) carburetor fueled
    Engine displacement = 49.76 cc
    Bore/stroke = 39,88×40 mm
    Compression ratio = 11.5:1
    Clutch = Wet, multiple plate
    Starting = Kickstart
    Exhaust = Catalytic converter
    Rotor Ignition/Generator = 85w/120w
    Cooling System = Liquid-cooled
    Fuel Tank Size = 7 litres
    Fuel System = Carburetor Dell'Orto PVHA 17.5 mm
       Main Jet = 95
       Needle Jet = A13, notch #2
       Idle Jet = 30
    Transmission
       1st = 1st 11/34
       2nd = 2nd 15/30
       3rd = 3rd 18/27
       4th = 4th 20/24
       5th = 5th 22/23
       6th = 6th 23/22
       Primary Drive = 21/78
    Sprockets
       Front = 14 Teeth
       Rear = 53 Teeth
       Overall Final Drive ratio = 14/53
    Spark Plug = DENSO W27ESR-U/IW27 NGK BR9ES/BR9EG/BR9EIX
       Gap = .6-7 mm
    Wheelbase = 55.354 in (1,406 mm)
    Length = 79.68 in (2,024 mm)
    Width = 80.511 in (2,045 mm)
    Height = 32.677 in (830 mm)
    Tires = Front: 90/90 - 21 inch; Rear: 110/80 - 18-inch

### Restriction

Restriction varies depending on the country and sky, person, or company the bike is purchased from. The engine is usually restricted in the following ways:
    Carburetor
       'Strangle' baffle/plate in Air filter manifold
       74 Main jet
    Exhaust
       Exhaust fume/pressure outlet pipes
       Catalytic converter
    Sprockets
       Front; reduced to 11/53 or 12/53
    Ignition system (only on models 2018 and after)
       Limited to 8000 RPM