The 2017 Cobra CX50 FWE is a junior motocross bike for young racers. Its liquid-cooled 50cc two-stroke single drives a single-speed automatic transmission and chain. A 680 mm seat, 41 kg dry weight and a 4.2-litre tank make it light and manageable for children.
Editorial estimate from the spec sheet - not lab tested
Off-road & trail95%
Cornering85%
City riding5%
Daily riding5%
Touring5%
Two-up0%
Track20%
Best for
Designed purely for closed-course motocross and off-road play on a scaled-down, race-inspired chassis.
Built for
A miniature works-style motocrosser with fully adjustable premium suspension and race-derived components, delivering surprisingly serious off-road capability in a small package.
Not ideal for
It is not suitable for highway riding, commuting, carrying a passenger, or any rider seeking speed, comfort, or long-distance touring.
Scores are derived from the spec sheet using the same model across every bike, so they compare like for like.
Full specifications
Engine
Capacity
50.0 ccm
Power
5.4 HP (4.0 kW)
Engine type
Single, two-stroke
Power/weight ratio
0.1317 HP/kg (dry)
Bore x stroke
39.0 x 41.7 mm
Cooling system
Liquid
Fuel system
Carburettor
Starting
Kick
Lubrication system
Mixture lubrication
Transmission
Gearbox
1-speed
Transmission type
Manual
Final drive
Chain
Clutch
Cobra 4G x 3-Shoe
Dimensions & weight
Wheelbase
990 mm
Seat height
680 mm
Dry weight
41.0 kg
Fuel capacity
4.20 litres
Ground clearance
245 mm
Chassis & suspension
Frame
Twin Spar
Front suspension
USD 32 mm fork
Rear suspension
Piggyback Canister Shock
Front wheel travel
210 mm
Rear wheel travel
248 mm
Brakes & wheels
Front brakes
Single disc. Hydraulic
Front brakes diameter
160 mm
Rear brakes
Single disc. Hydraulic
Rear brakes diameter
140 mm
Front tyre
2.50-10
Rear tyre
2.75-10
Other
Color options
Yellow/red/black/white
Specs last verified against published sources: .
Compiled from manufacturer documentation and user contributions, corrected on an ongoing basis. Spotted something wrong? Tell us.
What changed, year to year
Differences highlighted
Specification
2016
2017
2018
2025
2026
Capacity
50 cc
50 cc
50 cc
50 cc
50 cc
Dry weight
41 kg
41 kg
41 kg
40 kg
40 kg
Seat height
680 mm
680 mm
680 mm
680 mm
680 mm
Fuel capacity
4.2 L
4.2 L
4.2 L
2.8 L
2.8 L
Illustrative - generated automatically by diffing the year records already on file, not a manufacturer-published changelog.
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