KTM 350 SX-F - 2021 Specifications and Reviews

The 2021 KTM 350 SX-F is a lightweight motocross bike engineered for intermediate to advanced riders seeking a nimble, powerful platform. Its 349cc liquid-cooled four-stroke engine delivers strong mid-range performance with excellent maneuverability, making it ideal for technical terrain and competitive racing. Known for responsive handling and aggressive styling, the 350 SX-F bridges the gap between smaller and larger displacement competition bikes.

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General information

CategoryCross / motocross
Year2021
ModelKTM 350 SX-F
 
 

Engine and Transmission Specifications

Driveline5/8 x 1/4
ClutchWet multi-disc clutch, Brembo hydraulics
Transmission typeChain   (final drive)
Gearbox5-speed
Cooling systemLiquid
IgnitionKeihin EMS
Bore x Stroke88.0 x 57.5 mm (3.5 x 2.3 inches)
Engine typeSingle cylinder, four-stroke
Capacity:349.7 ccm (21.34 cubic inches)

Brakes, suspension, Frame and wheels

Rear brakesSingle disc
Diameter260 mm (10.2 inches)
Front brakesSingle disc
Rear wheel travel300 mm (11.8 inches)
Rear SuspensionWP XACT Monoshock with linkage
Front wheel travel310 mm (12.2 inches)
Front SuspensionWP XACT-USD, Ø 48 mm
Rake (fork angle)26.1°
Frame typeCentral double-cradle-type 25CrMo4 steel

Physical measures and capacities

Fuel capacity7.00 litres (1.85 US gallons)
Ground clearance370 mm (14.6 inches)
Seat height950 mm (37.4 inches) If adjustable, lowest setting.
Dry weight99.5 kg (219.4 pounds)

Other specs

MaintenanceFind parts, fluids, filters, maintenance tools and service items on eBay
Electrical2Ah Lithium battery.
StarterElectric
Color optionsOrange/white/black

Performance Profile & Rider Fit

Best For

Track70%
City10%
Cornering90%
Daily Riding10%
Touring10%
Passenger5%

Rider Profile

Best ForThis is a competition-grade motocross machine best suited to intermediate through expert off-road riders comfortable with a tall, aggressive, race-ready motorcycle.
PurposeBuilt purely for motocross and off-road competition, excelling at jumps, berms, and technical terrain rather than any road use.
Rider FitThe tall 958 mm seat height, firm suspension, and light but demanding standing-riding ergonomics call for good fitness, leg length, and core strength.
CharacterA sharp, high-revving single-cylinder engine paired with a featherweight chassis gives it razor-sharp agility and instant throttle response for aggressive riders.
Not Ideal ForThis is not a fit for commuters, touring riders, passengers, or anyone seeking a comfortable, road-legal, low-maintenance motorcycle.

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

Rider Fit Visualizer

2021 KTM 350 SX-F Rider Ergonomics Assessment

Calculated in your browser only - your height/inseam are never sent to our servers.

Feet:

At 950mm, a rider of 175cm with a 79cm (estimated) inseam will reach the ground with cannot reach comfortably on the 2021 KTM 350 SX-F, with a cramped knee angle of around 85 degrees and an upright riding position.

Data quality: estimated (wheelbase estimated from this category's typical bike, not this model's own spec). Assumes about 30mm of suspension sag once seated (a typical street-bike rule of thumb - stiffer or softer suspension will vary). This is an approximation from category-typical geometry and generic body proportions, not a measurement of this specific bike or you - sit on it before you buy.

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Rider Reviews

Total comments: 1
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MotorcycleDB Review

The 2021 KTM 350 SX-F is a powerhouse of a motorcycle, delivering exceptional performance and handling for riders of all skill levels. The 350cc engine provides a perfect balance of power and agility, making it ideal for both motocross and off-road trail riding. With a lightweight frame and top-of-the-line suspension, this bike effortlessly tackles any terrain with ease, giving riders the confidence to push their limits. In addition to its impressive performance, the 2021 KTM 350 SX-F boasts a sleek and aggressive design that is sure to turn heads on the track or trail. The bike's high-quality components and advanced technology make it a top choice for riders looking for a reliable and exciting ride. Whether you're a seasoned rider or just starting out, the 2021 KTM 350 SX-F is a formidable motorcycle that offers unmatched versatility and adrenaline-pumping excitement.
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