What category is the 2021 KTM 150 SX?

The 2021 KTM 150 SX has a Category of Cross / motocross.

What is the engine size of the 2021 KTM 150 SX?

The 2021 KTM 150 SX has a Capacity: of 144.0 ccm (8.79 cubic inches).

What type of engine does the 2021 KTM 150 SX have?

The 2021 KTM 150 SX has a Engine type of Single cylinder, two-stroke.

Is the 2021 KTM 150 SX air cooled or liquid cooled?

The 2021 KTM 150 SX has a Cooling system of Liquid.

How many gears does the 2021 KTM 150 SX have?

The 2021 KTM 150 SX has a Gearbox of 6-speed.

How much does the 2021 KTM 150 SX weigh?

The 2021 KTM 150 SX has a Dry weight of 87.5 kg (192.9 pounds).

What is the seat height of the 2021 KTM 150 SX?

The 2021 KTM 150 SX has a Seat height of 850 mm (33.5 inches) If adjustable, lowest setting..

KTM 150 SX - 2021 Specifications and Reviews

Name: 2021 KTM 150 SX
Brand: KTM

The 2021 KTM 150 SX is a competitive 144cc two-stroke motocross machine designed for junior and intermediate riders seeking race-ready performance. Known for its lightweight agility and responsive power delivery, it combines proven KTM engineering with Brembo hydraulics and liquid cooling for reliability on the track. This class staple excels in youth motocross competition and provides an accessible stepping stone to higher-displacement racing bikes.

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2021

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General information
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Category	Cross / motocross
Year	2021
Model	KTM 150 SX
Engine and Transmission Specifications
Driveline	14:50. Primary drive: 23:73.
Clutch	Multi-plate clutch, Brembo hydraulics
Transmission type	Chain (final drive)
Gearbox	6-speed
Cooling system	Liquid
Ignition	Kokusan EMS
Fuel system	Carburettor. Mikuni TMX
Bore x Stroke	58.0 x 54.5 mm (2.3 x 2.1 inches)
Engine details	Reed intake.
Engine type	Single cylinder, two-stroke
Capacity:	144.0 ccm (8.79 cubic inches)

Brakes, suspension, Frame and wheels
Wheels	CNC machined hubs. Excel rims. Wire spoked.
Rear brakes	Single disc. Two-piston calipers.
Diameter	260 mm (10.2 inches)
Front brakes	Single disc. Four-piston calipers.
Rear wheel travel	300 mm (11.8 inches)
Rear Suspension	WP XACT Monoshock with linkage
Front wheel travel	310 mm (12.2 inches)
Front Suspension	WP XACT-USD, Ã˜ 48 mm
Rake (fork angle)	26.1°
Frame type	25CrMo4 steel central-tube

Physical measures and capacities
Fuel capacity	7.50 litres (1.98 US gallons)
Wheelbase	1485 mm (58.5 inches)
Ground clearance	375 mm (14.8 inches)
Seat height	850 mm (33.5 inches) If adjustable, lowest setting.
Dry weight	87.5 kg (192.9 pounds)
Other specs
Maintenance	Find parts, fluids, filters, maintenance tools and service items on eBay
Starter	Kick
Color options	Orange/white/black

Performance Profile & Rider Fit

Best For

Track90%

City5%

Cornering88%

Daily Riding5%

Touring5%

Passenger0%

Rider Profile

Best For	Best suited to intermediate-to-advanced off-road riders, as a small-bore two-stroke motocross machine demands active riding and precise clutch and throttle control to stay in its power band.
Purpose	Built purely for motocross and cross-country racing on dirt tracks, not for street or commuting use.
Rider Fit	Its ultra-light dry weight and tall seat height favor smaller or lighter riders who can still comfortably manage the high seat and aggressive riding stance.
Character	A high-strung, revvy two-stroke that rewards aggressive riding, quick gear changes, and an active body position with sharp, flickable handling.
Not Ideal For	Not suitable for riders wanting a comfortable, relaxed, road-going or touring motorcycle, or anyone seeking passenger capability or long-distance comfort.

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

Rider Fit Visualizer

2021 KTM 150 SX Rider Ergonomics Assessment

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Feet:

At 850mm, a rider of 175cm with a 79cm (estimated) inseam will reach the ground with tip-toe one foot on the 2021 KTM 150 SX, with a cramped knee angle of around 75 degrees and a slightly forward riding position.

Data quality: measured. 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

MotorcycleDB Review

The 2021 KTM 150 SX is a powerful and nimble motocross bike that delivers exceptional performance on the track. With its lightweight and compact design, this bike offers excellent maneuverability and handling, making it an ideal choice for riders looking to dominate in the MX2 class. The 150cc two-stroke engine provides impressive power and torque, allowing riders to accelerate quickly and conquer any obstacle on the track. Additionally, the bike's top-notch suspension and braking system further enhance its performance, giving riders the confidence to push their limits. Overall, the 2021 KTM 150 SX is a top-tier motocross bike that offers impressive performance and agility on the track. With its powerful two-stroke engine, superior handling, and advanced suspension, this bike is well-equipped to handle the demands of motocross competition. Whether you're a seasoned rider or a competitive racer, the 150 SX is a solid choice for those looking to take their motocross skills to the next level.