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KTM 300 EXC 2018 - User Manual

KTM 300 EXC 2018
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OWNER'S MANUAL 2018
250 EXC
250 XC‑W
300 EXC
300 XC‑W
300 XC‑W Six Days
Art. no. 3213644en

Table of Contents

Questions and Answers

  • M
    Mark BurnsAug 16, 2025
    What to do if my KTM Motorcycle engine cannot be cranked?
    • Q
      qthomasAug 16, 2025
      If your KTM Motorcycle's engine cannot be cranked by the electric starter, possible causes include a discharged battery, a blown main fuse, a faulty starter relay, or a faulty starter motor. Recharge the battery, check the charging voltage, closed current and alternator. Change the main fuse if it's blown and check both the starter relay and starter motor for any issues. Also, ensure you are following the correct start procedure.
  • J
    Janice GuzmanAug 22, 2025
    Why KTM Motorcycle engine does not speed up?
    • S
      Sophia TaylorAug 22, 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 running over because the float needle is dirty or worn, or the carburetor jets might be loose. In either case, check/set the carburetor components. Additionally, a fault in the ignition system could be the cause, so inspect the ignition system.
  • K
    Kellie HillAug 25, 2025
    Why does my KTM Motorcycle engine have too little power?
    • A
      Amy DuncanAug 26, 2025
      If your KTM Motorcycle engine has too little power, the issue might stem from several causes. The fuel feed could be interrupted; in this case, check the fuel tank breather, clean the fuel tap, and check/set the carburetor components. A very dirty air filter can also restrict power, so clean the air filter and air filter box. Check the exhaust system for leaks or deformation, and replace the glass fiber yarn filling in the main silencer if it's insufficient. A fault in the ignition system could also be the culprit, so inspect the ignition system. Lastly, examine the diaphragm and reed valve housing for any damage.
  • V
    valenzuelamichelleAug 28, 2025
    What to do if KTM Motorcycle engine overheats?
    • E
      Elizabeth JosephAug 28, 2025
      If your KTM Motorcycle engine overheats, first check the coolant level and inspect the cooling system for leaks. If the motorcycle is stationary, switch off the engine to prevent overheating due to insufficient airflow. Clean the radiator fins if they are very dirty. If there's foam formation in the cooling system, drain and refill the coolant. Also, inspect the cylinder head and cylinder head gasket for damage. Replace any bent radiator hoses.
  • J
    Jacob TurnerAug 31, 2025
    What causes KTM Motorcycle engine to stall or pop into the carburetor?
    • M
      Margaret HunterAug 31, 2025
      If your KTM Motorcycle engine stalls or pops into the carburetor, there are a few potential causes to investigate. First, ensure the engine isn't running out of fuel by turning the fuel tap to the ON position and refueling if necessary. Also, check the intake flange and carburetor for tightness, as the engine might be taking in bad air. Lastly, inspect the connector or ignition coil for looseness or oxidation; clean the connector and treat it with contact spray if needed.
  • C
    Charles BrandtSep 3, 2025
    How to fix KTM 300 EXC 2018 engine when it has no idle?
    • K
      Kelly RyanSep 3, 2025
      If your KTM Motorcycle engine has no idle, the possible causes include a blocked idling jet, distorted adjusting screws on the carburetor, a defective spark plug or a defective ignition system. Check/set the carburetor components. Adjust the idle speed. Change the spark plug. Check the ignition coil and the spark plug connector.
  • C
    cohenjessicaSep 6, 2025
    Why gear oil exits at the vent hose of my KTM Motorcycle?
    • H
      Hannah BoydSep 6, 2025
      If gear oil is exiting at the vent hose of your KTM Motorcycle, it's likely due to too much gear oil having been added. Check the gear oil level.
  • K
    Kelly BradySep 9, 2025
    Why is my KTM 300 EXC 2018 emitting white smoke?
    • C
      Corey PonceSep 9, 2025
      If you see white smoke emission (steam in exhaust gas) from your KTM Motorcycle, it could be caused by a damaged cylinder head or cylinder head gasket. Check the cylinder head and cylinder head gasket.
  • M
    Matthew YoungSep 12, 2025
    How to fix water in the gear oil of KTM Motorcycle?
    • M
      michaelpierceSep 12, 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
    Joshua VasquezNov 18, 2025
    What to do if KTM 300 EXC 2018 Motorcycle engine turns but does not start?
    • S
      Sydney BakerNov 18, 2025
      If your KTM Motorcycle engine turns but doesn't start, several factors could be at play. You might not be 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 issue; in that case, empty the carburetor float chamber. Also, the fuel feed might be interrupted, so check the fuel tank breather and clean the fuel tap. A spark plug that is oily or wet can also prevent starting, so clean and dry the spark plug, or replace it if necessary. Ensure the spark plug electrode gap is correctly adjusted to 0.60 mm (0.0236 in). Other potential causes include a fault in the ignition system, a defective kill switch, loose or oxidized connectors on the ignition coil (clean the connector and treat it with contact spr...

Summary

Safety Advice

Intended Use and Misuse

Defines the intended purpose of the vehicle and the consequences of misuse.

Risk Degrees and Tampering Warning

Explains risk symbols and warns against tampering with noise control systems.

General Safety Advice

Safe Operation Practices

Details safety measures for riding, including risks of accidents and poisoning.

Serial Numbers

Controls

Clutch, Hand Brake, and Throttle Grip

Describes the operation of clutch lever, hand brake lever, and throttle grip.

Kill Switch and Light Switches

Details the operation of kill switches and light switches for different models.

Locking and Unlocking the Steering

Provides instructions for locking and unlocking the motorcycle's steering.

Kill Switch and Horn Operation

Explains the function of the kill switch and horn button.

Horn and Turn Signal Switches

Describes the function of the horn and turn signal switches.

Controls

Turn Signal, Emergency OFF, and Starter Button

Explains turn signal, emergency OFF, and electric starter button functions.

Indicator Lamps Overview

Shows the layout and function of indicator lamps for EXC and XC-W models.

Map Switch Operation

Details the function and warning associated with the map switch.

Fuel Filler Cap Operation

Provides instructions and safety warnings for opening the fuel filler cap.

Fuel Tap Functionality

Explains the different states and operation of the fuel tap.

Controls

Choke and Shift Lever Operation

Describes the choke function and how to read shift lever positions.

Foot Brake Lever and Side Stand

Details the foot brake lever and the side stand operation.

Kick Starter Mechanism

Steering Lock Mechanism

Combination Instrument

Instrument Overview and Activation

Describes the combination instrument layout and its activation process.

Speed Display Modes

Describes different speed display modes like SPEED/H and SPEED/ODO.

Setting Kilometers;Miles

Setup Menu and Unit Settings

Combination Instrument

Adjusting Instrument Functions

Setting the Clock

Combination Instrument

Speed;Trip Master Displays

Explains display modes for trip masters TR1 and TR2.

Stopwatch Functions

Details how to use the stopwatch functions, including resetting lap times.

Odometer Display and TR1;TR2 Setting

Explains odometer display and manual setting of trip masters TR1 and TR2.

Average Speed and Stopwatch Functions

Details the operation of average speed and stopwatch modes.

Average Speed and Stopwatch Displays

Details display modes for average speeds (A1, A2) and stopwatches (S1, S2).

Preparing for Use

Advice on First Use

Covers initial advice for riding, including safety and basic checks.

Running In the Engine

Provides guidelines for the engine break-in period to ensure longevity.

Preparing for Use

Battery Starting Power and Difficult Conditions Prep

Addresses low-temperature battery performance and prep for difficult riding conditions.

Preparing for Use

Dry Sand Riding Preparations

Wet Sand Riding Preparations

Wet;Muddy Surface Preparations

Low Temperature;Snow Riding Preparations

High Temperature;Slow Speed Prep

Riding Instructions

Pre-Ride Checks and Maintenance

Lists essential checks and maintenance tasks before riding.

Starting Off and Shifting Gears

Explains the procedure for starting off and shifting gears.

Braking Techniques

Details correct braking techniques and warnings.

Starting the Vehicle Safely

Provides instructions for safely starting the motorcycle engine.

Stopping and Parking Procedures

Provides instructions for stopping and parking the vehicle safely.

Riding Instructions

Transporting the Motorcycle

Riding Instructions

Refueling Procedures and Safety

Details safe refueling procedures and fuel handling warnings.

Service Schedule

Recommended Maintenance Work

Required Work Intervals

Tuning the Chassis

Basic Chassis Setting and Rider Weight

Explains how to set the chassis based on rider weight.

High-Speed Compression Damping Adjustment

Provides instructions for adjusting the high-speed compression damping of the shock absorber.

Spring Pretension Adjustment

Details how to adjust the spring pretension of the shock absorber.

Fork Compression Damping Adjustment

Provides instructions for adjusting the fork's compression damping.

Fork Rebound Damping Adjustment

Details how to adjust the rebound damping of the motorcycle fork.

Shock Absorber Compression Damping

Describes the high-speed and low-speed compression damping ranges.

Low-Speed Compression Damping Adjustment

Details how to adjust the low-speed compression damping of the shock absorber.

Tuning the Chassis

Rebound Damping Adjustment

Details how to adjust the rebound damping of the shock absorber.

Handlebar Position Adjustment

Tuning the Chassis

Static Sag Checking

Describes the procedure for checking the static sag of the shock absorber.

Riding Sag Adjustment

Explains how to adjust the riding sag of the shock absorber.

Fork Spring Pretension Adjustment

Explains how to adjust the spring pretension for the fork on Six Days models.

Riding Sag Checking

Provides instructions for checking the riding sag of the shock absorber.

Basic Fork Setting Check

Service Work on the Chassis

Removing Fork Legs

Service Work on the Chassis

Installing Fork Legs

Removing Lower Triple Clamp (Standard Models)

Removing Lower Triple Clamp (Six Days Models)

Installing Lower Triple Clamp (Six Days Models)

Removing Shock Absorber

Removing Fuel Tank

Installing Fuel Tank

Installing Lower Triple Clamp (Standard Models)

Installing Shock Absorber

Hydraulic Clutch Fluid Check;Correction

Service Work on the Chassis

Checking Steering Head Bearing Play

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

Adjusting Steering Head Bearing Play

Provides steps for adjusting the steering head bearing play.

Chain Inspection and Cleaning

Covers checking the chain for dirt and cleaning procedures.

Checking Chain, Sprockets, and Guide

Details how to check the chain, sprockets, and chain guide for wear.

Service Work on the Chassis

Chain Tension Checking and Adjustment

Explains how to check and adjust the chain tension.

Brake System

Hand Brake Lever Free Travel Check and Adjustment

Covers checking and adjusting the free travel of the hand brake lever.

Brake System

Hand Brake Lever Position Adjustment

Front Brake Fluid Level Check

Front Brake Linings Check

Front Brake Linings Replacement

Foot Brake Lever Free Travel Check

Foot Brake Lever Position Adjustment

Rear Brake Fluid Level Check

Adding Rear Brake Fluid

Rear Brake Linings Check

Brake Disc Thickness Check

Adding Front Brake Fluid

Rear Brake Linings Replacement

Wheels, Tires

Removing Front Wheel

Wheels, Tires

Installing Front Wheel

Installing Rear Wheel

Tire Condition Check

Removing Rear Wheel

Tire Air Pressure Check

Wheels, Tires

Electrical System

Battery Removal Procedures

Battery Installation Procedures

Battery Recharging Process

Headlight Setting Check and Adjustment

Electrical System

Main Fuse Replacement

Combination Instrument Battery Replacement

Electrical System

Headlight Bulb Replacement

Cooling System

Coolant Level Check

Refilling with Coolant

Antifreeze and Coolant Level Check

Draining the Coolant

Tuning the Engine

Throttle Cable Play Check and Adjustment

Covers checking and adjusting the play in the throttle cable.

Carburetor Setting Overview

Explains the effects of different carburetor components on engine tuning.

Carburetor Idle Adjustment

Details how to adjust the carburetor for optimal idle speed.

Idle Speed Adjustment

Provides steps for adjusting the engine's idle speed.

Tuning the Engine

Ignition Curve Connector and Timing Map

Shift Lever Position Check and Adjustment

Tuning the Engine

Engine Characteristic and Auxiliary Spring

Service Work on the Engine

Emptying Carburetor Float Chamber

Service Work on the Engine

Gear Oil Level Check

Adding Gear Oil

Gear Oil Change Procedure

Cleaning, Care

Storage

Motorcycle Storage Procedures

Preparing for Use After Storage

Troubleshooting

Engine Starting and Running Faults

Addresses common issues related to engine starting and running.

Engine Power and Overheating Faults

Covers issues like low power, overheating, and smoke emissions.

Technical Data

Engine Tightening Torques

Fork Specifications

Shock Absorber Specifications

Chassis Tightening Torques

Technical Data

Carburetor Specifications and Tuning

Technical Data

Substances

Brake Fluid and Coolant Specifications

Engine Oil and Fork Fluid Specifications

Fuel Specifications

KTM 300 EXC 2018 Specifications

General IconGeneral
Displacement293.2 cm³
Bore x Stroke72 mm x 72 mm
Transmission6-speed
Fuel SystemKeihin PWK 36S AG
Rear SuspensionWP Xplor PDS Shock Absorber
Seat Height960 mm
Ground Clearance370 mm
Weight (without fuel)103 kg
Engine Type2-stroke
FrameCentral-Tube Frame
Front SuspensionWP Xplor 48
Front Brake260 mm disc
Rear Brake220 mm Disc Brake
Fuel Capacity9.5 l

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