KTM 50 SX 2017 - User Manual

Questions and Answers

R
Regina MoranAug 17, 2025
What to do if KTM Motorcycle engine overheats?
- C
  Cynthia CarpenterAug 17, 2025
  If your KTM Motorcycle engine overheats, there are several potential causes. One common reason is insufficient coolant in the cooling system, so check for leaks and verify the coolant level. Another factor could be too little air stream; switch off the engine when standing. Dirty radiator fins can also contribute to overheating, so clean them thoroughly. Other potential issues include foam formation in the cooling system (drain and refill the coolant), a damaged cylinder head or gasket (inspect these components), or a bent radiator hose (replace it if necessary).
E
Emily HillAug 21, 2025
How to fix KTM Motorcycle engine with no idle?
- M
  Matthew RoyAug 21, 2025
  If your KTM Motorcycle engine has no idle, several issues could be responsible. A blocked idling jet is a common cause, so check/set the carburetor components. Incorrectly adjusted screws on the carburetor can also prevent proper idling; adjust the idle speed. A defective spark plug can also cause this issue, so replace it. Finally, a defective ignition system may be the problem, so check the ignition coil and spark plug connector.
C
christinaandradeAug 25, 2025
What to do if KTM 50 SX 2017 engine stalls or is popping into the carburetor?
- F
  Fernando RayAug 25, 2025
  If your KTM Motorcycle engine stalls or is popping into the carburetor, it could be due to a lack of fuel. Turn the knurled screw on the fuel tap all the way counterclockwise and fill up with fuel. Another possibility is that the engine is taking in bad air, so check the intake flange and carburetor for tightness. Also, a loose or oxidized connector or ignition coil can cause these symptoms; clean the plug-in connection and treat it with contact spray.
T
Taylor WilsonAug 27, 2025
Why KTM 50 SX 2017 engine does not speed up?
- B
  Blake CruzAug 27, 2025
  If your KTM Motorcycle engine does not speed up, it could be due to several reasons related to the carburetor or ignition system. The carburetor might be overflowing because the float needle is dirty or worn, or the carburetor jets might be loose, so check/set the carburetor components. Additionally, a fault in the ignition system could be the cause, so check the ignition system.
A
Andrew SanchezSep 3, 2025
What causes white smoke emission in KTM 50 SX 2017?
- K
  Kristina HaasSep 3, 2025
  If you notice white smoke emission (steam in exhaust gas) from your KTM Motorcycle, it could be due to a damaged cylinder head or cylinder head gasket. In this case, check the cylinder head or cylinder head gasket.
E
Eric BaileySep 6, 2025
Why gear oil exits at the vent hose in KTM Motorcycle?
- D
  Daniel ConnerSep 6, 2025
  If gear oil exits at the vent hose of your KTM Motorcycle, it is likely due to too much gear oil being added. To resolve this, check the gear oil level.
I
igriffinSep 9, 2025
What causes water in the gear oil of KTM 50 SX 2017?
- D
  David VaughnSep 9, 2025
  If there is water in the gear oil of your KTM Motorcycle, it could be due to a damaged shaft seal ring or water pump. Check the shaft seal ring and water pump.
J
Jessica DeanNov 13, 2025
Why KTM Motorcycle engine turns but does not start?
- P
  pattonjayNov 13, 2025
  If your KTM Motorcycle's engine turns but doesn't start, several factors could be at play. It might be an operating error, so ensure you're following the correct start procedure. If the motorcycle has been sitting unused for an extended period, old fuel in the float chamber could be the culprit; in this case, empty the carburetor float chamber. Another possibility is an interrupted fuel supply, so inspect the fuel tank breather and clean the fuel tap. Also, a spark plug that's oily or wet can prevent starting, so clean and dry the spark plug, replacing it if necessary. Check the plug gap and adjust it to 0.60 mm (0.0236 in). Problems within the ignition system, a frayed short circuit cable, a defective kill switch, a loose or oxidized connector or ignition coil, or water in the carburetor ...
J
johnsonginaDec 1, 2025
Why KTM 50 SX 2017 engine has too little power?
- M
  Mrs. Sophia OsbornDec 1, 2025
  If your KTM Motorcycle engine has too little power, a few things might be wrong. Check the fuel supply, as it might be interrupted; inspect the fuel tank breather and clean the fuel tap. A very dirty air filter can also cause this issue, so clean the air filter and air filter box. Additionally, a leaky or deformed exhaust system, or one with too little glass fiber yarn filling in the main silencer, can reduce power; check the exhaust system for damage and replace the glass fiber yarn filling if needed. Other potential causes include a defective ignition system (check the ignition coil and spark plug connector), a damaged diaphragm or reed valve housing (inspect these components), noticeable wear (overhaul the engine), or a clutch engagement speed that's too low or too high (check the clutc...

Summary

Means of Representation

Symbols Used

Explains the meaning of specific symbols used in the manual.

Formats Used

Explains the typographical formats used in the document.

Safety Advice

Use Definition - Intended Use

Defines the intended use of KTM sport motorcycles and safety precautions.

Degrees of Risk and Symbols

Explains danger levels and associated symbols for safety instructions.

Safe Operation

Provides essential safety guidelines for operating the motorcycle.

Protective Clothing

Emphasizes the importance of appropriate protective gear for riders.

Work Rules

Outlines general rules and procedures for performing work on the vehicle.

Environment

Discusses responsible use and environmental considerations for the motorcycle.

Owners Manual

Stresses the importance of reading and keeping the owner's manual.

Important Notes

Manufacturer and Implied Warranty

Details warranty coverage and conditions for KTM motorcycles.

Operating and Auxiliary Substances

Provides guidance on the proper use of fuels, oils, and other necessary fluids.

Spare Parts, Accessories

Recommends using approved KTM parts and accessories for safety.

Service

Highlights the importance of proper service for optimal operation and longevity.

View of Vehicle

View of Vehicle, Front Left (Example)

Illustrates the front-left view of the motorcycle with labeled components.

View of Vehicle, Rear Right (Example)

Illustrates the rear-right view of the motorcycle with labeled components.

Serial Numbers

Chassis Number

Locates and describes the vehicle's chassis identification number.

Type Label

Indicates the location of the vehicle's type label for identification.

Engine Number

Specifies the location of the engine's serial number.

Fork Part Number

Identifies the part number stamped on the motorcycle's fork.

Shock Absorber Article Number

Pinpoints the article number stamped on the shock absorber.

Controls

Hand Brake Lever

Describes the function and location of the front brake lever.

Throttle Grip

Details the function and location of the throttle grip.

Kill Switch

Explains the operation and states of the kill switch.

Filler Cap

Provides instructions for opening and closing the fuel filler cap.

Oil Tank Cap (50 SX Mini)

Guides on opening and closing the oil tank cap for the 50 SX Mini.

Fuel Tap

Describes the function and states of the fuel tap.

Choke (50 SX; 50 SX Mini)

Explains the choke lever/knob for cold starts on 50 SX and 50 SX Mini.

Kick Starter

Details the function and operation of the kick starter.

Foot Brake Lever

Describes the location and function of the rear brake foot lever.

Plug-in Stand

Explains the purpose and use of the plug-in stand.

Preparing for Use

Advice on First Use

Provides crucial safety advice and preparation steps before the first ride.

Running in the Engine

Guides on the engine break-in procedure and performance limits.

Riding Instructions

Checks and Maintenance Measures When Preparing for Use

Lists essential pre-ride checks and maintenance tasks.

Starting

Provides instructions and safety warnings for starting the motorcycle.

Starting Up

Details the procedure for starting the engine after initial checks.

Riding

Offers advice on safe riding practices and handling.

Applying the Brakes

Explains proper braking techniques and safety precautions.

Stopping, Parking

Provides guidelines for safely stopping and parking the motorcycle.

Transport

Offers advice on safely transporting the motorcycle.

Refueling

Details the procedure and safety precautions for refueling the motorcycle.

Filling up with Oil (50 SX Mini)

Guides on filling the oil tank for the 50 SX Mini model.

Service Schedule

Additional Information

Notes on additional work required or recommended for service.

Required Work

Lists maintenance tasks required at specific operating hour intervals.

Recommended Work

Details recommended maintenance tasks based on operating hours and annually.

Tuning the Chassis

Checking the Basic Chassis Setting with the Riders Weight

Explains how to adjust chassis settings based on rider weight.

Air Suspension AER 35 (50 SX)

Describes the AER 35 air suspension system used in the 50 SX fork.

Compression Damping of the Shock Absorber (50 SX)

Explains how to adjust compression damping on the 50 SX shock absorber.

Adjusting the Low-Speed Compression Damping of the Shock Absorber (50 SX)

Details the procedure for adjusting low-speed compression damping.

Adjusting the High-Speed Compression Damping of the Shock Absorber (50 SX)

Details the procedure for adjusting high-speed compression damping.

Adjusting the Rebound Damping of the Shock Absorber

Guides on adjusting rebound damping for both 50 SX and 50 SX Mini.

Measuring Rear Wheel Sag Unloaded

Explains how to measure unloaded rear wheel sag.

Checking the Static Sag of the Shock Absorber

Details how to check the static sag of the shock absorber.

Checking the Riding Sag of the Shock Absorber

Describes how to check the riding sag of the shock absorber.

Adjusting the Spring Preload of the Shock Absorber

Guides on adjusting the spring preload for 50 SX and 50 SX Mini shock absorbers.

Adjusting the Riding Sag

Explains how to adjust riding sag by selecting appropriate springs.

Checking the Basic Setting of the Fork

Provides guidance on checking the fork's basic settings.

Adjusting the Fork Air Pressure (50 SX)

Details the procedure for adjusting air pressure in the 50 SX fork.

Adjusting the Rebound Damping of the Fork (50 SX)

Explains how to adjust rebound damping on the 50 SX fork.

Handlebar Position

Describes handlebar mounting positions and measurements.

Adjusting Handlebar Position

Guides on adjusting the handlebar position for rider comfort.

Adjusting the Seat Height

Details how to adjust the motorcycle's seat height.

Service Work on the Chassis

Raising the Motorcycle with a Lift Stand

Instructs on safely raising the motorcycle using a lift stand.

Removing the Motorcycle from the Lift Stand

Guides on safely removing the motorcycle from a lift stand.

Bleeding the Fork Legs

Explains the process of bleeding air from the fork legs.

Cleaning the Dust Boots of the Fork Legs

Details how to clean the dust boots on the fork legs.

Removing the Fork Protector

Guides on removing the fork protector.

Installing the Fork Protector

Instructs on installing the fork protector.

Removing the Fork Legs

Details the procedure for removing the motorcycle's fork legs.

Installing the Fork Legs

Guides on installing the motorcycle's fork legs.

Removing the Lower Triple Clamp

Explains how to remove the lower triple clamp assembly.

Installing the Lower Triple Clamp

Guides on installing the lower triple clamp assembly.

Checking Play of Steering Head Bearing

Describes how to check for play in the steering head bearing.

Adjusting the Steering Head Bearing Play

Details the procedure for adjusting steering head bearing play.

Greasing the Steering Head Bearing

Explains how to grease the steering head bearing.

Removing the Fuel Tank

Provides instructions for safely removing the fuel tank.

Installing the Fuel Tank

Guides on safely installing the fuel tank.

Removing the Start Number Plate

Details how to remove the start number plate.

Installing the Start Number Plate

Guides on installing the start number plate.

Dismounting the Front Fender

Explains how to remove the front fender.

Installing the Front Fender

Guides on installing the front fender.

Removing the Shock Absorber

Details the procedure for removing the shock absorber.

Installing the Shock Absorber

Guides on installing the shock absorber.

Removing the Seat

Explains how to remove the motorcycle seat.

Mounting the Seat

Guides on installing the motorcycle seat.

Removing the Air Filter

Details the procedure for removing the air filter.

Installing the Air Filter

Guides on installing the air filter.

Cleaning the Air Filter and Air Filter Box

Explains how to clean the air filter and its box.

Removing the Main Silencer

Details how to remove the main silencer.

Installing the Main Silencer

Guides on installing the main silencer.

Changing the Glass Fiber Yarn Filling of the Main Silencer

Explains how to change the glass fiber yarn filling in the main silencer.

Removing the Engine Sprocket Cover

Details how to remove the engine sprocket cover.

Installing the Engine Sprocket Cover

Guides on installing the engine sprocket cover.

Checking the Chain for Dirt

Explains how to check the chain for dirt accumulation.

Cleaning the Chain

Provides instructions for cleaning the motorcycle chain.

Checking the Chain Tension

Details how to check the chain tension.

Adjusting the Chain Tension

Guides on adjusting the chain tension.

Checking the Chain, Rear Sprocket, Engine Sprocket, and Chain Guide

Explains how to check wear on the chain, sprockets, and chain guide.

Adjusting the Chain Guide

Details how to adjust the chain guide.

Checking the Frame

Explains how to check the frame for damage.

Checking the Swingarm

Details how to check the swingarm for damage.

Checking the Throttle Cable Routing

Explains how to check the throttle cable routing.

Checking the Rubber Grip

Details how to check the rubber grips on the handlebar.

Additionally Securing the Rubber Grip

Guides on how to secure rubber grips additionally.

Brake System

Checking Play of Handbrake Lever

Describes how to check the play in the handbrake lever.

Adjusting the Play of the Hand Brake Lever

Guides on adjusting the play in the handbrake lever.

Adjusting the Basic Position of the Hand Brake Lever

Details how to adjust the basic position of the hand brake lever.

Checking Brake Discs

Explains how to check the thickness and condition of brake discs.

Checking the Front Brake Fluid Level

Guides on checking the front brake fluid level.

Adding Front Brake Fluid

Provides instructions for adding front brake fluid.

Checking the Front Brake Linings

Details how to check the minimum thickness of front brake linings.

Changing the Front Brake Linings

Guides on changing the front brake linings.

Checking the Rear Brake Fluid Level

Describes how to check the rear brake fluid level.

Adding Rear Brake Fluid

Provides instructions for adding rear brake fluid.

Checking the Rear Brake Linings

Details how to check the minimum thickness of rear brake linings.

Changing the Rear Brake Linings

Guides on changing the rear brake linings.

Checking the Free Travel of the Foot Brake Lever

Explains how to check the free travel of the foot brake lever.

Adjusting the Free Travel of the Foot Brake Lever

Guides on adjusting the free travel of the foot brake lever.

Adjusting the Basic Position of the Foot Brake Lever

Details how to adjust the basic position of the foot brake lever.

Wheels, Tires

Removing the Front Wheel

Details the procedure for removing the front wheel.

Installing the Front Wheel

Guides on installing the front wheel.

Removing the Rear Wheel

Details the procedure for removing the rear wheel.

Installing the Rear Wheel

Guides on installing the rear wheel.

Checking the Tire Condition

Explains how to check tire condition, damage, and tread depth.

Checking Tire Air Pressure

Guides on checking and setting tire air pressure.

Checking Spoke Tension

Details how to check and adjust spoke tension.

Cooling System

Describes the basic operation of the motorcycle's cooling system.

Checking the Antifreeze and Coolant Level

Guides on checking the antifreeze and coolant levels.

Checking the Coolant Level

Details how to check the coolant level in the radiator.

Draining the Coolant

Explains the procedure for draining the coolant.

Refilling with Coolant

Guides on refilling the cooling system with coolant.

Tuning the Engine

Checking the Installation Position of the Throttle Grip

Describes how to check the throttle grip's installation position.

Checking the Play of the Throttle Cable

Guides on checking the play in the throttle cable.

Adjusting the Play in the Throttle Cable

Details how to adjust the play in the throttle cable.

Carburetor - Idle (50 SX; 50 SX Mini)

Explains idle settings for 50 SX and 50 SX Mini carburetors.

Carburetor - Adjusting Idle Speed (50 SX; 50 SX Mini)

Guides on adjusting idle speed for both 50 SX and 50 SX Mini.

Checking the Clutch Setting

Details how to check the clutch setting using a tachometer.

Removing the Clutch Cover

Explains how to remove the clutch cover.

Adjusting the Clutch

Guides on adjusting the clutch slip speed.

Installing the Clutch Cover

Details how to install the clutch cover.

Service Work on the Engine

Checking Oil Level (50 SX Mini)

Guides on checking the engine oil level for the 50 SX Mini.

Bleeding the Oil Pump (50 SX Mini)

Details how to bleed the oil pump for the 50 SX Mini.

Checking the Gear Oil Level

Explains how to check the gear oil level.

Changing the Gear Oil

Guides on changing the gear oil.

Adding Gear Oil

Details how to add gear oil.

Cleaning, Care

Cleaning Motorcycle

Provides instructions for cleaning the motorcycle safely and effectively.

Storage

Details steps for storing the motorcycle for extended periods.

Preparing for Use After Storage

Guides on preparing the motorcycle for use after it has been stored.

Troubleshooting

Technical Data

Engine

Provides specifications for the motorcycle's engine.

Engine Tightening Torques

Lists torque specifications for various engine components.

Carburetor with Carburetor Tuning

Details carburetor types and tuning specifications for 50 SX and 50 SX Mini.

Capacities

Lists capacities for gear oil, coolant, and fuel.

Chassis

Provides chassis specifications including frame, fork, and suspension.

Tires

Lists tire specifications and sizes for different models.

Fork

Details specifications for the front fork, including damping and oil.

Shock Absorber

Provides specifications for the shock absorber, including damping and spring rates.

Chassis Tightening Torques

Lists torque specifications for various chassis components.

Substances

Standards

List of Abbreviations

KTM 50 SX 2017 Specifications

General

Displacement	49 cc
Cooling	Liquid cooled
Starter	Kickstarter
Front Brake	Disc brake
Rear Brake	Disc brake
Dry Weight	41.5 kg
Seat Height	684 mm
Engine Type	Single-cylinder, 2-stroke
Transmission	Single Speed Automatic
Front Suspension	WP AER 35, USD Ø 35 mm
Rear Suspension	WP monoshock
Bore x Stroke	39.5 mm x 40 mm