What causes KTM 125 SX 2020 engine not to speed up?
If your KTM Motorcycle engine does not speed up, it could be due to the carburetor running over because the float needle is dirty or worn, or loose carburetor jets. In both cases, you should check the carburetor components. Additionally, a fault in the ignition system could be the cause, so check the ignition system.
Why does my KTM 125 SX 2020 engine have so little power?
Several issues could cause your KTM Motorcycle engine to have too little power. The fuel feed might be interrupted; check the fuel tank breather, clean the fuel tap, and inspect the carburetor components. A very dirty air filter can also restrict power, so clean the air filter and air filter box. Inspect the exhaust system for leaks or deformation and consider changing the glass fiber yarn filling in the main silencer. A fault in the ignition system could also be responsible, so check the ignition system. Lastly, inspect the diaphragm and reed valve housing for damage.
What to do if KTM 125 SX 2020 engine overheats?
If your KTM Motorcycle engine overheats, start by checking the cooling system for leaks and ensure the coolant level is adequate. If the engine is stationary, switch it off to prevent overheating due to too little air stream. Clean the radiator fins if they are very dirty. If there's foam in the cooling system, drain and refill it with coolant. Inspect the cylinder head and cylinder head gasket for damage. Finally, check the radiator hose and change it if it's bent.
Why does my KTM 125 SX 2020 Motorcycle engine stall or pop in the carburetor?
If your KTM Motorcycle engine stalls or pops in the carburetor, it could be due to a lack of fuel; ensure the fuel tap is in the ON position and refuel if necessary. The engine might be taking in bad air, so check the intake flange and carburetor for tightness. Also, check the connector and treat it with contact spray if it's loose or oxidized.
What does white smoke from KTM 125 SX 2020 Motorcycle exhaust mean?
White smoke emission (steam in exhaust gas) from your KTM Motorcycle exhaust could indicate a damaged cylinder head or cylinder head gasket. In this case, you should check the cylinder head and cylinder head gasket.
Why is gear oil coming out of the KTM 125 SX 2020 Motorcycle vent hose?
If gear oil is exiting at the vent hose of your KTM Motorcycle, it could be because too much gear oil was added. Check the gear oil level.
General| Engine Type | 1-cylinder, 2-stroke engine |
|---|---|
| Displacement | 124.8 cm³ |
| Bore x Stroke | 54 mm x 54.5 mm |
| Starter | Kickstarter |
| Transmission | 6-speed |
| Front Brake | Disc brake |
| Rear Brake | Disc brake |
| Ground Clearance | 375 mm |
| Seat Height | 950 mm |
| Clutch | Wet, multi-disc clutch, Brembo hydraulics |
| EMS | Kokusan |
| Frame | Central double-cradle type, 25CrMo4 steel |
| Front Suspension | WP XACT-USD, Ø 48 mm |
| Rear Suspension | WP XACT shock absorber with linkage |
| Fuel Tank Capacity | 7.5 liters |
| Fuel System | Keihin carburetor |
Explains symbols and typographical formats used in the manual for clarity.
Defines intended use, misuse dangers, and general safety advice.
Covers safe operation, tampering warnings, and protective clothing requirements.
Addresses environmental aspects and the importance of the owner's manual.
Covers warranty, fuel, auxiliary substances, and spare parts.
Information on service, figures, and customer service.
Illustrates vehicle components from front-left and rear-right views.
Details where to find vehicle identification, type label, and engine numbers.
Identifies clutch, brake levers, throttle, kill switch, and fuel systems.
Covers choke, shift lever, kick starter, and service hour counter.
Advice for first use, pre-sales checks, and engine break-in procedures.
Prepares vehicle for sand, mud, high/low temperatures, and snow.
Essential checks before riding and engine starting procedures.
Covers starting off, shifting, braking, and stopping procedures.
Guidelines for transporting the motorcycle and safe refueling.
Lists required service tasks and their intervals.
Lists recommended maintenance tasks and intervals.
Adjusting chassis settings based on rider weight and suspension.
Details compression and rebound damping adjustments for the shock absorber.
Covers checking and adjusting fork air pressure and damping.
Adjusting handlebar position for rider comfort and ergonomics.
Steps for raising, removing, and installing fork legs.
Covers fork protector, frame, and front fender checks and installation.
Procedures for removing/installing triple clamps and checking steering head bearing.
Steps for removing and installing the rear shock absorber.
Checking free travel and adjusting basic position of hand brake lever.
Checking brake discs wear limits and front/rear brake fluid levels.
Procedures for checking and changing front and rear brake linings.
Adjusting foot brake lever free travel and basic position.
Steps for removing and installing the front wheel.
Procedures for removing and installing the rear wheel.
Checking tire condition, age, and correct pressure.
Methods for checking and adjusting spoke tension.
Explains cooling system operation and radiator cover usage.
Procedures for installing and removing radiator covers.
How to check antifreeze protection and coolant levels.
Steps for draining and refilling the cooling system with coolant.
Checking and adjusting throttle cable play for smooth operation.
Explains carburetor components and their influence on performance.
Procedures for setting idle speed and mixture using adjustment screws.
Changing ignition timing maps for soft or performance settings.
Safely drains fuel from the carburetor float chamber.
How to check and change the engine gear oil.
Guidelines for washing the motorcycle safely and effectively.
Lubricating moving parts and protecting surfaces after cleaning.
Steps for preparing the motorcycle for long-term storage.
Procedures for getting the motorcycle ready after storage.
Diagnoses and actions for engine starting problems.
Addresses overheating, stalling, and power loss issues.
Provides detailed engine data for 125 and 150 SX models.
Lists torque specifications for various engine components.
Details carburetor types, settings, and tuning for different conditions.
Technical data for frame, suspension, brakes, and tires.
Details types and properties of brake fluid and coolant.
Specifies engine oil, 2-stroke oil, and fork oil types.
Lists recommended cleaning agents, greases, and sprays.
Explains JASO, SAE, and other relevant standards for fluids.
Provides a list of common abbreviations used in the manual.
An alphabetical index to help locate specific topics within the manual.
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