What category is the 2020 Thumpstar MX 50 JR?

The 2020 Thumpstar MX 50 JR has a Category of Minibike, cross.

What is the engine size of the 2020 Thumpstar MX 50 JR?

The 2020 Thumpstar MX 50 JR has a Capacity: of 49.0 ccm (2.99 cubic inches).

What type of engine does the 2020 Thumpstar MX 50 JR have?

The 2020 Thumpstar MX 50 JR has a Engine type of Single cylinder, two-stroke.

How much does the 2020 Thumpstar MX 50 JR weigh?

The 2020 Thumpstar MX 50 JR has a Dry weight of 41.5 kg (91.5 pounds).

What is the seat height of the 2020 Thumpstar MX 50 JR?

The 2020 Thumpstar MX 50 JR has a Seat height of 603 mm (23.7 inches) If adjustable, lowest setting..

Thumpstar MX 50 JR - 2020 Specifications and Reviews

Name: 2020 Thumpstar MX 50 JR
Brand: Thumpstar

The 2020 Thumpstar MX 50 JR is an entry-level pit bike designed for young riders and beginners learning fundamental motocross skills. Its lightweight 41.5kg frame, low 603mm seat height, and responsive handling make it ideal for small-framed riders developing confidence on technical terrain. Known for reliable kick-start simplicity and adjustable suspension, it delivers affordable performance for backyard practice and junior competition.

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2020

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Engine and Transmission Specifications
Clutch	Centrifugal
Fuel system	Carburettor. Mikuni 19mm
Bore x Stroke	39.5 x 40.0 mm (1.6 x 1.6 inches)
Engine type	Single cylinder, two-stroke
Capacity:	49.0 ccm (2.99 cubic inches)

Category	Minibike, cross
Year	2020
Model	Thumpstar MX 50 JR
Brakes, suspension, Frame and wheels
Wheels	Steel Rim
Rear brakes	Single disc. Single Piston
Diameter	190 mm (7.5 inches)
Front brakes	Single disc. Dual piston hydraulic disc
Rear wheel travel	185 mm (7.3 inches)
Rear Suspension	Fastace Adjustable Shock
Front wheel travel	205 mm (8.1 inches)
Front Suspension	Fastace Adjustable Forks
Frame type	Central-Tube Frame with Double-Cradle

Physical measures and capacities
Fuel capacity	2.30 litres (0.61 US gallons)
Wheelbase	1032 mm (40.6 inches)
Ground clearance	252 mm (9.9 inches)
Seat height	603 mm (23.7 inches) If adjustable, lowest setting.
Dry weight	41.5 kg (91.5 pounds)
Other specs
Maintenance	Find parts, fluids, filters, maintenance tools and service items on eBay
Starter	Kick
Color options	Green/Black

Performance Profile & Rider Fit

Best For

Track40%

City5%

Cornering55%

Daily Riding5%

Touring5%

Passenger5%

Rider Profile

Best For	This is a youth/beginner-oriented minibike, intended for kids or very small novice riders learning basic off-road control rather than experienced adults.
Purpose	Built for casual backyard and light trail riding, letting young riders practice throttle control, balance, and braking on a small two-stroke cross-style machine.
Rider Fit	Its low 603mm seat height and 41.5kg dry weight make it accessible and manageable for lightweight junior riders rather than full-sized adults.
Character	The small-bore two-stroke engine, centrifugal clutch, and adjustable off-road suspension give it a playful, forgiving, easy-to-manage nature suited to skill-building rather than outright performance.
Not Ideal For	This bike is not suitable for adult riders, highway use, touring, or anyone seeking real speed or long-distance comfort.

Character map is an editorial estimate based on this bike's specifications, not a lab-tested measurement.

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Rider Reviews

Total comments: 1

MotorcycleDB Review

The 2020 Thumpstar MX 50 JR is a fantastic choice for young riders looking to get into off-road riding. This smaller-sized motorcycle is designed with beginners in mind, featuring a manageable 50cc engine and a lightweight frame. The MX 50 JR offers a smooth and easy ride, making it perfect for gaining confidence and learning the fundamentals of dirt biking. With its durable construction and reliable performance, this Thumpstar model is sure to provide endless hours of fun for young riders. In addition to its practical design, the 2020 Thumpstar MX 50 JR has a sleek and stylish look that kids will love. The vibrant graphics and bold color options make this bike stand out on the trails. With its user-friendly features and eye-catching appearance, the MX 50 JR is an excellent choice for parents seeking a safe and enjoyable motorcycle for their kids. Overall, the 2020 Thumpstar MX 50 JR is a top-notch option for young riders who are just starting out in the world of off-road riding.