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KTM 150 SX Dirt Bike Specs, Weight and Top Speed

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KTM 150 SX Dirt Bike In-Depth Guide

The 150 SX is a 192lb dirtbike manufactured by KTM. It’s 143cc engine and light weight give the KTM 150 SX a top speed of 73MPH in stock condition. Reliable, affordable and with many performance specs at low cost, what’s not to like? Overall KTM has managed to retain an excellent power to weight ratio on its very race friendly 150 SX series motocross bikes. Seat height is 38.8 inches.

I’ve written about how KTM has improved the quality of it’s line of dirt bikes since 2009. New bodywork on 2-stroke models, a new silencer, a new airbox and an optimized intake flange connecting to the carburetor are just a few of the changes I’ve been impressed with. In 2011 KTM dirt bike provided more horsepower from their 143.6cc engine than the 2009 model did which is proof of innovation. The 2016 and 2017 models raised the bar further.KTM

KTM 150 SX Dirt Bike Engine Specs:

  • Engine type: single cylinder, 2-stroke
  • Displacement: 143.6 cc
  • Bore x stroke: 56 x 58.4 mm (2.20 x 2.30)
  • Starter: kickstart
  • KTM 150 SX weight: 192lb
  • Transmission: 6 gears
  • Carburetor: Keihin PWK 38S AG
  • KTM 150 SX Top Speed: 73MPH (stock condition)
  • Control: exhaust control
  • Lubrication: mixture oil lubrication 1:40
  • Transmission oil: Motorex, SAE 15W50
  • cooling: liquid cooling
  • Clutch: wet multi-disc clutch, operated hydraulically
  • Ignition: Kokusan

This KTM 150 SX dirt bike review wouldn’t be complete without a warning, you’ll want to squeeze the skinny frame between your knees when you open up to full throttle. KTM kept the price low by not offering extras like an electric kick start instead of by reducing engine performance and that’s OK with me.

In 2009 the KTM 150 SX Dirt Bike was a hit with young racers who enjoyed it’s power and agile handling characteristics. The 150sx is also simple to properly maintain. A single cylinder 2-stroke engine rated at 143.6cc with a 6 gear transmission and Keihin PWK-S 38 AG carburetor powers this dirt bike. Who says 2 strokes can’t perform against similar 4 stroke engines? The KTM 150 SX Dirt Bike takes on rough terrain without feeling sluggish and that’s quite an accomplishment for the price.

The KTM story continues to evolve into one of results driven dedication and I’m not alone in taking notice. Suggested retail price is a very reasonable 6,899.00 for 2016 KTM models.

Do you need proof that KTM takes pride in their craftsmanship? The KTM trail bike’s name is cut in steel! Join us in the forums to discuss this great dirtbike a little more.

Full Specs – 2009 150 SX Motocross Dirtbike

  • Model: KTM 150 SX
  • Type: Enduro – offroad
  • Displacement: 143.60 ccm (8.76 cubic inches)
  • Engine type: Single cylinder, two-stroke
  • Bore x stroke: 56.0 x 58.5 mm (2.2 x 2.3 inches)
  • Fuel system: Carburetor. Keihin PWK 39
  • Ignition: Kokusan
  • Lubrication system: 1:40 Oil Mixture
  • Cooling system: Liquid
  • Gearbox: 6-speed
  • final drive: Chain
  • Clutch: Multi disc wet clutch, hydraulic
  • Exhaust system: Aluminum
  • Frame type: Central double-cradle-type 25 CrMo4. Aluminum sub frame
  • Rake (fork angle): 27.0 degrees
  • Front suspension: WP USD
  • Front suspension travel: 300 mm (11.8 inches)
  • Rear suspension: WP PDS shock absorber
  • Rear suspension travel: 335 mm (13.2 inches)
  • Front tire dimensions: 80/100-21
  • Rear tire dimensions: 100/90-19
  • Front brakes: Single disc
  • Front brakes diameter: 260 mm (10.2 inches)
  • Rear brakes: Single disc
  • Rear brakes diameter: 220 mm (8.7 inches)
  • Dry weight: 90.8 kg (200.2 pounds)
  • KTM 150 SX Seat height: 38.8 inches
  • Ground clearance: 390 mm (15.4 inches)
  • Wheelbase: 1,471 mm (57.9 inches)
  • Fuel capacity: 8.00 liters (2.11 gallons)