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2017 KTM 50 SX Overview
The 2017 KTM 50 SX is a cross / motocross motorcycle built around 49 cc of displacement. Under the tank sits a Single cylinder, two-stroke engine. The bore and stroke measures 39.5 x 40 mm. From a practical standpoint, the 2017 50 SX tips the scales at 41.5 kg, carries a 2.30-litre fuel tank, offers a seat height of 684 mm and spans a 1,032 mm wheelbase. Scroll down for the complete 2017 KTM 50 SX spec sheet covering every technical detail from suspension travel to tyre sizes.
2017 KTM 50 SX compared with other bikes in the Cross / motocross category
Here is how the 2017 KTM 50 SX stacks up against other bikes in the Cross / motocross category in our database. Each model counts once, using the model year closest to this one, and the comparison covers up to 224 models.
- Engine displacement of 49 cc is smaller than that of 218 of the other 223 bikes in the Cross / motocross category.
- Only 6 of the other 199 bikes in the Cross / motocross category have a lower seat height than the 684 mm of the 50 SX.
- 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 2016 model
The figures we track are unchanged from the 2016 model: displacement and seat height all match.
2017 50 SX - Pros & Cons
Strengths
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🛑
Strong front braking: The single disc front brake gives excellent stopping power and responds well to aftermarket braided lines.
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📏
Accessible seat height: At 684 mm, the seat height is approachable for a wide range of rider heights and builds confidence in low-speed manoeuvring.
Considerations
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🔧
Carburetor fuelling: Carbureted engines need occasional jetting attention and can be reluctant in cold weather or at altitude compared to modern fuel-injected alternatives.
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⛽
Modest fuel capacity: The 2.30-litre tank means more frequent fuel stops on longer rides, which is worth planning around on touring routes.
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⚙️
Chain final drive upkeep: Chain final drive needs regular cleaning, lubrication and tension checks to get full life out of the sprockets.
Wear Points & Servicing Notes
Carburetor maintenance
The 50 SX uses carburetion rather than fuel injection, which means jetting is altitude- and temperature-sensitive and benefits from a clean-and-rejet after extended storage or an exhaust change.
Brake disc and pad wear
The single disc front brake gives strong, progressive stopping power. Disc thickness and pad depth are worth checking at every tyre change, since worn pads can score the disc surface.
Suspension condition on used examples
Up front, the 50 SX runs WP upside-down ? 35 mm and WP shock absorber at the rear. On a used example, check fork seals for weeping oil and test the rear linkage for play - seals are a relatively cheap fix but useful when negotiating price.
Final drive maintenance
Final drive is by chain - expect to clean and lube it every few hundred kilometres and check tension regularly; a neglected chain wears the sprockets faster than the chain itself.
Frame & chassis check
The frame is Central-tube frame with double-cradle - worth a visual check for corrosion or impact damage around the head-stock and swingarm pivot on any used example, since frame damage is far costlier to fix than any service item.
Low-speed handling
At just 41.5 kg, the 50 SX is light enough to manhandle easily at a standstill - one of the practical advantages of its class.
50 SX - Buying & Maintenance Guide
What to check before buying
When inspecting a used 2017 KTM 50 SX with its 49 cc cross / motocross, start with the basics: check the service book for oil change frequency, inspect the drivetrain for wear, and look for oil seepage around the engine casings and rocker covers. 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 9 years old, this cross / motocross is as likely to show age-related wear (perished rubber, seized fasteners, degraded seals) as mileage-related wear. A cold start test is invaluable - a well-maintained 50 SX should fire up cleanly and settle to a smooth idle within a few seconds.
Oil and filter changes
Regular oil changes are the single most important maintenance task for the 50 SX's 49 cc single cylinder, two-stroke. Stick to the manufacturer's interval - typically every 6,000 km or once a year, whichever comes first. Always use the correct viscosity grade as specified in the owner's manual.
Carburetor upkeep
Keep the carburetors clean and free of deposits. If the 50 SX has been stored, strip and clean the carb float bowls before attempting to start it. Pilot jets are the first to block and the last to be checked - always include them in any carb rebuild.
2017 KTM 50 SX - Frequently Asked Questions
What engine does the 2017 KTM 50 SX have?
The 2017 KTM 50 SX uses a Single cylinder, two-stroke engine with 49 cc of displacement.
How much does the 2017 KTM 50 SX weigh?
The 2017 KTM 50 SX weighs 41.5 kg. This is the manufacturer's dry figure.
What is the fuel tank capacity of the 2017 KTM 50 SX?
The 2017 KTM 50 SX has a 2.30-litre fuel tank. At around 5-6 litres per 100 km, that is roughly 38-45 km between stops.
Is the 2017 KTM 50 SX suitable for shorter riders?
The 2017 KTM 50 SX has a seat height of 684 mm. This is a comfortable, accessible height for most riders.
What brakes does the 2017 KTM 50 SX have?
The 2017 KTM 50 SX 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 2017 KTM 50 SX use?
The 2017 KTM 50 SX uses Carburettor. Mikuni TMX, providing precise fuelling across the rev range and reliable cold-start behaviour.
What suspension does the 2017 KTM 50 SX have?
The 2017 KTM 50 SX uses WP upside-down ? 35 mm up front and WP shock absorber at the rear.
KTM 50 SX Spec Evolution
The KTM 50 SX was produced across 17 model years (2006-2023). 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 |
2006 |
2007 |
2008 |
2009 |
2010 |
2011 |
2012 |
2013 |
2014 |
2015 |
2016 |
2017 |
2018 |
2019 |
2021 |
2022 |
2023 |
| Wet Weight |
- |
- |
- |
- |
- |
104.0 kg / 229.3 lbs |
- |
- |
112.0 kg / 246.9 lbs |
- |
- |
- |
- |
- |
- |
- |
- |
| Dry Weight |
38.8 kg / 85.5 lbs |
38.8 kg / 85.5 lbs |
38.8 kg / 85.5 lbs |
39.8 kg / 87.7 lbs |
39.8 kg / 87.7 lbs |
39.8 kg / 87.7 lbs |
41.5 kg / 91.5 lbs |
41.5 kg / 91.5 lbs |
39.8 kg / 87.7 lbs |
39.8 kg / 87.7 lbs |
41.5 kg / 91.5 lbs |
41.5 kg / 91.5 lbs |
41.5 kg / 91.5 lbs |
41.5 kg / 91.5 lbs |
41.5 kg / 91.5 lbs |
41.5 kg / 91.5 lbs |
41.5 kg / 91.5 lbs |
| Engine Detail |
- |
- |
- |
- |
- |
- |
Reed intake |
Reed intake. |
Reed intake. |
Reed intake. |
Reed intake. |
Reed intake. |
Reed intake |
Reed intake |
- |
- |
- |
| Engine Type |
Single cylinder |
Single cylinder |
Single cylinder |
Single cylinder |
Single cylinder, two-stroke |
Single cylinder, two-stroke |
Single cylinder, two-stroke |
Single cylinder, two-stroke |
Single cylinder, two-stroke |
Single cylinder, two-stroke |
Single cylinder, two-stroke |
Single cylinder, two-stroke |
Single cylinder, two-stroke |
Single cylinder, two-stroke |
Single cylinder, two-stroke |
Single cylinder, two-stroke |
Single cylinder, two-stroke |
| Seat Height |
650 mm / 25.6 in. |
650 mm / 25.6 in. |
660 mm / 26.0 in. |
684 mm / 26.9 in. |
684 mm / 26.9 in. |
684 mm / 26.9 in. |
684 mm / 26.9 in. |
684 mm / 26.9 in. |
684 mm / 26.9 in. |
684 mm / 26.9 in. |
684 mm / 26.9 in. |
684 mm / 26.9 in. |
684 mm / 26.9 in. |
684 mm / 26.9 in. |
684 mm / 26.9 in. |
665 mm / 26.2 in. |
665 mm / 26.2 in. |
| Fuel Capacity |
1.80 litres / 0.48 gallons |
1.80 litres / 0.48 gallons |
1.80 litres / 0.48 gallons |
2.30 litres / 0.61 gallons |
2.30 litres / 0.61 gallons |
2.30 litres / 0.61 gallons |
2.30 litres / 0.61 gallons |
2.30 litres / 0.61 gallons |
2.30 litres / 0.61 gallons |
2.30 litres / 0.61 gallons |
2.30 litres / 0.61 gallons |
2.30 litres / 0.61 gallons |
2.30 litres / 0.61 gallons |
2.30 litres / 0.61 US gallons |
2.30 litres / 0.61 US gallons |
2.30 litres / 0.61 US gallons |
2.30 litres / 0.61 US gallons |
| Stroke |
2 |
2 |
2 |
2 |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
2-stroke |
| Ground Clearance (mm) |
255 mm |
255 mm |
255 mm |
255 mm |
252 mm |
252 mm |
252 mm |
252 mm |
252 mm |
252 mm |
252 mm |
252 mm |
252 mm |
252 mm |
252 mm |
252 mm |
252 mm |
Key Specifications
Engine
Single cylinder, two-stroke
Weight
41.5 kg / 91.5 lbs
Fuel Capacity
2.30 litres / 0.61 gallons
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Full 2017 KTM 50 SX 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
1,032 mm / 40.6 in.
Dry Weight
41.5 kg / 91.5 lbs
Fuel Capacity
2.30 litres / 0.61 gallons
Displacement (cc)
49.00 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
Gearbox
1-speed
Frame Type
Central-tube frame with double-cradle
Suspension - Front
WP upside-down ? 35 mm
Suspension - Rear
WP shock absorber
Rake
24.0°
Wheel Travel - Front
205 mm / 8.1 in.
Wheel Travel - Rear
185 mm / 7.3 in.
Brakes - Front Diameter (in.)
6.3 inches
Brakes - Front Diameter (mm)
160 mm
Brakes - Rear Diameter (in.)
6.3 inches
Brakes - Rear Diameter (mm)
160 mm
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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