Motorcycles Specs > Thumpstar > Thumpstar MX 50 JR

Thumpstar MX 50 JR Specs

The Thumpstar MX 50 JR model is a Minibike, cross bike manufactured by Thumpstar . In this version sold from year 2020 , the dry weight is 41.5 kg (91.5 pounds) and it is equipped with a Single cylinder, two-stroke motor. The engine produces a maximum peak output power of  and a maximum torque of  . With this drive-train, the Thumpstar MX 50 JR is capable of reaching a maximum top speed of  . On the topic of chassis characteristics, responsible for road holding, handling behavior and ride comfort, the Thumpstar MX 50 JR has a Central-Tube Frame with Double-Cradle frame with front suspension being Fastace Adjustable Forks and at the rear, it is equipped with Fastace Adjustable Shock . Stock tire sizes are  on the front, and  on the rear. As for stopping power, the Thumpstar MX 50 JR braking system includes Single disc. Dual piston hydraulic disc size 190 mm (7.5 inches) at the front and Single disc. Single Piston size 180 mm (7.1 inches) at the back. 

Thumpstar MX 50 JR General Information

Brand Thumpstar 
Model Thumpstar MX 50 JR 
Start year 2020 
Year 2020 
Category Minibike, cross 
Factory Warranty (Years / miles)

Thumpstar MX 50 JR Dimensions, Aerodynamics and weight

Frame type Central-Tube Frame with Double-Cradle 
Seat details
Wheelbase 1,032 mm (40.6 inches) 
Seat Height 603 mm (23.7 inches) If adjustable, lowest setting. 
Alternate Seat Height
Ground Clearance 252 mm (9.9 inches) 
Trail size
Wheels details Steel Rim 
Front Tyres - Rims dimensions
Rear Tyres - Rims dimensions
Front brakes Single disc. Dual piston hydraulic disc 
Rear brakes Single disc. Single Piston 
Front Brakes Dimensions - Disc Dimensions 190 mm (7.5 inches) 
Rear Brakes Dimensions - Disc Dimensions 180 mm (7.1 inches) 
Curb Weight (including fluids)
Dry Weight 41.5 kg (91.5 pounds) 
Front Percentage of Weight
Rear Percentage of Weight
Weight-Power Output Ratio :
Fuel Tank Capacity 2.30 litres (0.61 gallons) 
Reserve Fuel Capacity
Carrying Details and Capacity
Front Suspension Fastace Adjustable Forks 
Front Suspension Travel 205 mm (8.1 inches) 
Rear Suspension Fastace Adjustable Shock 
Rear Suspension Travel 185 mm (7.3 inches) 

Thumpstar MX 50 JR Engine and Transmission Technical Data

Engine type - Number of cylinders Single cylinder, two-stroke 
Engine details
Fuel system Carburettor. Mikuni 19mm 
Engine size - Displacement - Engine capacity 49.00 ccm (2.99 cubic inches) 
Bore x Stroke 39.5 x 40.0 mm (1.6 x 1.6 inches) 
Compression Ratio
Number of valves per cylinder
Camshaft Valvetrain Configuration
Maximum power - Output - Horsepower
Maximum torque
Engine Maximum RPM
Cooling system
Lubrication system
Engine oil capacity
Exhaust system
Transmission type, final drive ratio
Clutch type Centrifugal 

Thumpstar MX 50 JR Performance

Top Speed
Acceleration 0 to 100 km/h (0 to 62 mph)
Acceleration 0 to 400m (1/4 mile)
Recuperation 60 to 140 km/h in highest gear
Fuel Consumption - MPG - Economy - Efficiency
CO2 emissions

Thumpstar MX 50 JR Electrical Systems, Ignition and Equipment

Ignition Type
Electrical Details
Starter Type Kick 
How much does a Thumpstar MX 50 JR weighs?
The Thumpstar MX 50 JR weighs 41.5 kg (91.5 pounds).

How tall (seat height) is a Thumpstar MX 50 JR?
The Thumpstar MX 50 JR seat height is 603 mm (23.7 inches) If adjustable, lowest setting.