KTM 400 - User Manual

Questions and Answers

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jacksonjesseAug 28, 2025
What to do if my KTM Motorcycle engine cranks but doesn’t start?
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  Matthew OlsonAug 28, 2025
  If your KTM Motorcycle engine cranks but doesn't start, consider these possibilities: Ensure the fuel tap is open, there's fuel in the tank, and the choke is activated. If the motorcycle has been out of operation for a while, drain the old fuel from the float chamber. If the engine is flooded, pull the hand decompression lever, fully rev up the engine, and actuate the kickstarter 5 to 10 times or actuate the E-starter 2 times for 5 seconds each. Check the spark plug; if it's sooty or wet, unscrew and dry it. Also, verify the spark plug electrode gap and adjust it to 0.6 mm if it's too large. If there is no spark, exchange the spark plug. Finally, check for water in the carburetor or blocked jets, and clean the carburetor if necessary.
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Laura JarvisAug 27, 2025
Why KTM 400 Motorcycle has high oil consumption?
- N
  natasha63Aug 27, 2025
  High oil consumption in your KTM Motorcycle may be due to a buckling gearing ventilation hose; replace it with a non-buckling hose. Check the engine oil level when the engine is warm and correct it if necessary. Also, the motor oil might be too thin; use a thicker engine oil.
C
Christopher OlsonAug 26, 2025
What to do if KTM 400 Motorcycle engine will not reach full power?
- A
  Alan OliverAug 27, 2025
  If your KTM Motorcycle engine isn't reaching full power, the fuel supply may be partially interrupted, or the carburetor may be dirty. Clean and check both the fuel system and carburetor. Also check the air filter and clean or replace if it is very dirty. Finally, check the exhaust for leaks or blockages, and replace the glass fiber yarn in the exhaust silencer if necessary.
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Rebekah KimAug 25, 2025
What to do if KTM Motorcycle engine gets too hot?
- H
  holly99Aug 26, 2025
  If your KTM Motorcycle engine is overheating, there are several possible causes. First, check the cooling liquid level and refill if necessary, also inspect the cooling system for leaks. Ensure adequate airflow by riding at a faster pace. Clean the radiators with a water jet if they are dirty. If there's foam in the cooling system, replace the coolant with a brand-name antifreeze liquid. Inspect the cooling hoses for bends and either shorten or replace them. Lastly, the thermostat might be defective; remove and check it (it should open at 70°C/158°F), and replace if needed.

Summary

Important Safety and Operational Guidelines

Operation Instruments

Clutch, Decompression, and Brake Levers

Front Fork Suspension Adjustment

Compression and Rebound Damping Adjustment (Fork)

How to adjust the fork's compression and rebound damping.

Rear Shock Absorber and Steering Adjustment

Shock Absorber Damping Adjustment

Adjusting compression and rebound damping on shock absorbers.

Pre-Ride Checks and Initial Operation

Essential Pre-Ride Checks

A checklist of critical inspections before riding.

Initial Operation and Running-In Procedures

Guidance for first rides and engine break-in.

Engine Starting and Riding Techniques

Engine Starting Procedures (Cold, Warm, Flooded)

Steps for starting the engine in various states.

Starting Off and Shifting Gears

How to begin riding and change gears smoothly.

Braking and Stopping Procedures

Braking Techniques and Safety

Proper use of brakes and associated safety warnings.

Stopping and Parking Guidelines

Safe procedures for stopping the motorcycle and parking it.

Periodic Maintenance Schedule

Recommended Extra Order Maintenance

Key maintenance tasks recommended for professional service.

Rider Maintenance and Specialized Workshop Checks

Regular Rider Maintenance Checks

Essential checks riders should perform regularly.

Chassis and Engine Maintenance Procedures

Clutch Lever and Steering Head Bearing Adjustment

Front Fork Maintenance and Spring Preload

Handlebar Position and Shock Absorber Preload

Chain Tension, Maintenance, and Wear

Disc Brake System Information and Maintenance

Details on brake calipers, pads, discs, fluid, and safety.

Hand Brake Lever and Front Brake Fluid Checks

Rear Brake Pad and Fluid Checks

Front Wheel Removal and Installation

Rear Wheel Removal and Installation

Tire Pressure and Spoke Tension Checks

Cooling System Checks and Bleeding

Checking coolant level and bleeding the cooling system.

Air Filter Cleaning and Oiling

Carburetor Idle and Mixture Adjustment

Engine Oil Specifications and Changing

Selecting and changing engine oil and filters.

Troubleshooting Common Issues

Technical Data - Engine and Carburetor

Engine Specifications and Carburetor Settings

Detailed engine technical data and basic carburetor settings.

Technical Data - Chassis, Torques, and Clearances

Chassis Specifications and Tightening Torques

Chassis data, fork/shock adjustments, and torque specifications.

Assembly Clearances and Wear Limits

Specifications for assembly clearances and wear limits.

KTM 400 Specifications

General

Transmission	6-speed
Engine	Single-cylinder, 4-stroke
Starter	Electric
Cooling System	Liquid-cooled
Front Suspension	WP USD
Rear Suspension	WP
Front Brake	Single disc
Rear Brake	Single disc