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2019 KTM 50 SX Mini Overview
For 2019, KTM offers the 50 SX Mini as a cross / motocross motorcycle with 49 cc on tap. The 2019 KTM 50 SX Mini is built around a Single cylinder, two-stroke engine. Internally, bore and stroke are 39.5 x 40 mm. In everyday use, the 2019 50 SX Mini tips the scales at 40 kg, carries a 2.10-litre fuel tank, offers a seat height of 684 mm and spans a 1032 mm wheelbase. Every technical detail, from suspension travel to tyre sizes, is covered in the full 2019 KTM 50 SX Mini spec sheet below.
2019 KTM 50 SX Mini compared with other bikes in the Cross / motocross category
Measured against other bikes in the Cross / motocross category in our database (up to 224 models, one entry per model), the 2019 KTM 50 SX Mini comes out as follows.
- With 49 cc, the 50 SX Mini has the joint smallest engine displacement of 224 bikes in the Cross / motocross category, 82% below the category average of 279 cc.
- Seat height of 684 mm is lower than that of 191 of the other 199 bikes in the Cross / motocross category.
- Narrowing the field to the 105 models within five model years of it, the engine displacement of 49 cc is smaller than that of 101 of the other 104.
Versus the 2018 model
Compared with the 2018 model, seat height rose from 558 mm to 684 mm (+126 mm). Displacement is unchanged.
2019 50 SX Mini - Pros & Cons
Strengths
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Strong front braking: The single disc front brake bites hard and stays consistent - a solid foundation whether it's stock or upgraded with braided lines.
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Accessible seat height: At just 684 mm, flat-footing at a stop is easy for most riders - a genuine confidence builder for less experienced owners.
Considerations
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Carburetor fuelling: Carburetion is more hands-on than fuel injection - plan on periodic jetting and cleaning as part of routine ownership.
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Modest fuel capacity: A 2.10-litre tank keeps things light but means budgeting for more frequent fuel stops on any longer ride.
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Chain final drive upkeep: A chain drivetrain is the most common setup in its class, but it's also the one that demands the most regular hands-on maintenance.
Wear Points & Servicing Notes
Carburetor maintenance
Being carbureted, the 50 SX Mini is more sensitive to stale fuel and altitude changes than a fuel-injected bike - a carb clean and rejet restores crisp throttle response after any extended lay-up.
Brake disc and pad wear
Single disc with four-piston calipers up front provides the primary stopping power; inspect disc thickness and pad wear at each tyre change to catch scoring before it becomes a rotor replacement.
Suspension condition on used examples
Suspension duties are handled by WP upside-down Ø 35 mm up front and WP shock absorber at the rear. Weeping fork seals aren't a dealbreaker on a used bike, but they're a fair basis for negotiating price.
Final drive maintenance
Chain final drive on the 50 SX Mini means routine lubing and tension checks are part of ownership - skip them and sprocket wear accelerates noticeably.
Frame & chassis check
The Chrome-molybdenum steel central-tube frame chassis holds up well with normal use; on a used bike it's still worth checking the head-stock and swingarm pivot area for impact damage or corrosion.
Low-speed handling
The 50 SX Mini's 40 kg kerb weight makes low-speed control noticeably less effort than on a heavier machine.
50 SX Mini - Buying & Maintenance Guide
What to check before buying
A pre-purchase check on the 2019 KTM 50 SX Mini with its 49 cc cross / motocross should cover the same ground every time: service history, drivetrain condition, and any oil seepage around the casings. This model runs chain final drive, so check chain slack and sprocket tooth profile specifically - a worn sprocket is a cheaper fix now than after it's chewed up the next chain. Now 7 years old, this cross / motocross is as likely to show age-related wear (perished rubber, seized fasteners, degraded seals) as mileage-related wear. Start it from cold if you can - a well-kept 50 SX Mini settles to a smooth idle within seconds.
Oil and filter changes
Oil changes are the cheapest insurance you can buy for the 50 SX Mini's 49 cc single cylinder, two-stroke - keep to the manufacturer's interval rather than stretching it. Use the viscosity grade the manual specifies, not whatever's on sale.
Carburetor upkeep
A 50 SX Mini that's sat unused is almost always a carb-cleaning job before it runs right again - float bowls and pilot jets first, since they clog before anything else.
2019 KTM 50 SX Mini - Frequently Asked Questions
What engine does the 2019 KTM 50 SX Mini have?
The 2019 KTM 50 SX Mini uses a Single cylinder, two-stroke engine with 49 cc of displacement.
How much does the 2019 KTM 50 SX Mini weigh?
The 2019 KTM 50 SX Mini weighs 40 kg. This is the manufacturer's dry figure.
What is the fuel tank capacity of the 2019 KTM 50 SX Mini?
The 2019 KTM 50 SX Mini has a 2.10-litre fuel tank. At around 5-6 litres per 100 km, that is roughly 35-42 km between stops.
Is the 2019 KTM 50 SX Mini suitable for shorter riders?
The 2019 KTM 50 SX Mini has a seat height of 684 mm. This is a comfortable, accessible height for most riders.
What brakes does the 2019 KTM 50 SX Mini have?
The 2019 KTM 50 SX Mini uses single disc with four-piston calipers at the front and single disc with two-piston calipers at the rear.
What fuel system does the 2019 KTM 50 SX Mini use?
The 2019 KTM 50 SX Mini uses Carburettor. Mikuni TMX, providing precise fuelling across the rev range and reliable cold-start behaviour.
What suspension does the 2019 KTM 50 SX Mini have?
The 2019 KTM 50 SX Mini uses WP upside-down Ø 35 mm up front and WP shock absorber at the rear.
KTM 50 SX Mini Spec Evolution
The KTM 50 SX Mini was produced across 9 model years (2012-2023). The table below highlights the key specifications that changed across the production run - useful whether you are comparing years or tracking down a specific variant.
| Specification |
2012 |
2013 |
2014 |
2017 |
2018 |
2019 |
2021 |
2022 |
2023 |
| Dry Weight |
40.5 kg / 89.3 lbs |
40.5 kg / 89.3 lbs |
39 kg / 86.0 lbs |
40 kg / 88.2 lbs |
40 kg / 88.2 lbs |
40 kg / 88.2 lbs |
40 kg / 88.2 lbs |
40 kg / 88.2 lbs |
40 kg / 88.2 lbs |
| Engine Detail |
Reed intake |
Reed intake |
Reed intake |
Reed intake. |
Reed intake. |
Reed intake |
- |
- |
Reed-valve |
| Seat Height |
558 mm / 22.0 in. |
558 mm / 22.0 in. |
558 mm / 22.0 in. |
558 mm / 22.0 in. |
558 mm / 22.0 in. |
684 mm / 26.9 in. |
558 mm / 22.0 in. |
558 mm / 22.0 in. |
558 mm / 22.0 in. |
| Fuel Capacity |
2.00 litres / 0.53 gallons |
2.00 litres / 0.53 gallons |
2.00 litres / 0.53 gallons |
2.30 litres / 0.61 gallons |
2.30 litres / 0.61 gallons |
2.10 litres / 0.55 US gallons |
2.10 litres / 0.55 US gallons |
2.10 litres / 0.55 US gallons |
2.30 litres / 0.61 US gallons |
| Ground Clearance (mm) |
184 mm |
184 mm |
184 mm |
184 mm |
184 mm |
252 mm |
184 mm |
184 mm |
184 mm |
| Ground Clearance (in.) |
7.2 inches |
7.2 inches |
7.2 inches |
7.2 inches |
7.2 inches |
9.9 inches |
7.2 inches |
7.2 inches |
7.2 inches |
| Displacement (ci) |
2.99 cubic inches |
2.99 cubic inches |
2.99 cubic inches |
2.99 cubic inches |
2.99 cubic inches |
2.99 cubic inches |
3.04 cubic inches |
3.04 cubic inches |
3.04 cubic inches |
| Displacement (cc) |
49.00 cc |
49.00 cc |
49.00 cc |
49.00 cc |
49.00 cc |
49.0 cc |
49.8 cc |
49.8 cc |
49.8 cc |
Key Specifications
Engine
Single cylinder, two-stroke
Fuel Capacity
2.10 litres / 0.55 US gallons
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Full 2019 KTM 50 SX Mini Specifications
Comments
The engine power can be restricted to 5.5 hp with a kit.
Colours
Orange/white/black
Ground Clearance (in.)
9.9 inches
Ground Clearance (mm)
252 mm
Seat Height
684 mm / 26.9 in.
Wheelbase
1032 mm / 40.6 in.
Dry Weight
40 kg / 88.2 lbs
Fuel Capacity
2.10 litres / 0.55 US gallons
Displacement (cc)
49.0 cc
Displacement (ci)
2.99 cubic inches
Engine Type
Single cylinder, two-stroke
Bore x Stroke (in,)
1.6 x 1.6 inches
Bore x Stroke (mm)
39.5 x 40.0 mm
Engine Detail
Reed intake
Fuel System
Carburettor. Mikuni TMX
Engine Lubrication
Mixture oil lubrication
Ignition
Seletra 2p D36
Starter
Kick
Clutch
Centrifugal clutch
Final Drive
Chain (final drive)
Gearbox
1-speed
Frame Type
Chrome-molybdenum steel central-tube frame
Suspension - Front
WP upside-down Ø 35 mm
Suspension - Rear
WP shock absorber
Rake
24.0°
Wheel Travel - Front
100 mm / 3.9 in.
Wheel Travel - Rear
147 mm / 5.8 in.
Brakes - Front
Single disc. Four-piston calipers.
Brakes - Rear
Single disc. Two-piston calipers.
Rims
Wire spoked
Specifications are compiled from manufacturer documentation and cross-referenced
technical sources, and corrected on an ongoing basis.
Spot an error? Let us know.
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