KTM 150 SX - 2017 Specifications and Reviews

The 2017 KTM 150 SX is a lightweight, nimble 150cc two-stroke motocross bike engineered for young riders and smaller-framed competitors seeking sharp handling and explosive power delivery. Its compact dimensions, minimal 87.2 kg weight, and responsive WP suspension deliver precise control across varied terrain. Best known for its competitive-ready performance and accessibility in the junior racing category, it balances aggressive geometry with learner-friendly ergonomics.

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General information

CategoryCross / motocross
Year2017
ModelKTM 150 SX

Engine and Transmission Specifications

Driveline14:50. Primary drive: 23:73.
ClutchMulti-plate clutch, Brembo hydraulics
Transmission type,final driveChain
Gearbox6-speed
Cooling systemLiquid
IgnitionKokusan EMS
Fuel systemCarburettor. Mikuni TMX
Bore x Stroke58.0 x 54.5 mm (2.3 x 2.1 inches)
Engine detailsReed intake.
Engine typeSingle cylinder, two-stroke
Capacity:143.90 ccm (8.78 cubic inches)
 
 

Brakes, suspension, Frame and wheels

WheelsCNC machined hubs. Excel rims. Wire spoked.
Rear brakes diameter220 mm (8.7 inches)
Rear brakesSingle disc. Two-piston calipers.
Front brakes diameter260 mm (10.2 inches)
Front brakesSingle disc. Four-piston calipers.
Rear wheel travel300 mm (11.8 inches)
Rear SuspensionWP shock absorber with linkage
Front wheel travel310 mm (12.2 inches)
Front SuspensionWP-USD, AER 48, Ø 48 mm
Rake (fork angle)26.1°
Frame typeCentral tube frame made of chrome molybdenum steel tubing

Physical measures and capacities

Fuel capacity7.00 litres (1.85 gallons)
Wheelbase1,485 mm (58.5 inches)
Ground clearance375 mm (14.8 inches)
Seat height960 mm (37.8 inches) If adjustable, lowest setting.
Dry weight87.2 kg (192.2 pounds)
 
 

Other specs

MaintenanceFind parts, fluids, filters, maintenance tools and service items on eBay
StarterKick
Color optionsOrange/white/black

Performance Profile & Rider Fit

Best For

Track90%
City5%
Cornering88%
Daily Riding5%
Touring5%
Passenger0%

Rider Profile

Best ForBest 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.
PurposeBuilt purely for motocross and cross-country racing on dirt tracks, not for street or commuting use.
Rider FitIts 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.
CharacterA high-strung, revvy two-stroke that rewards aggressive riding, quick gear changes, and an active body position with sharp, flickable handling.
Not Ideal ForNot 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

2017 KTM 150 SX Rider Ergonomics Assessment

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

Feet:

At 960mm, a rider of 175cm with a 79cm (estimated) inseam will reach the ground with cannot reach comfortably on the 2017 KTM 150 SX, with a cramped knee angle of around 85 degrees and an upright 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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