KTM 2015 450 SX-F EU User Manual (English)

Questions and Answers:

S
sarahcarterAug 1, 2025
What to do if the engine does not turn when I press the starter button on my KTM 2015 450 SX-F EU?
- J
  jeffrey92Aug 1, 2025
  If your KTM Motorcycle engine does not turn when the starter button is pressed, it could be due to several reasons. You may need to carry out the start procedure. The battery might be discharged, so you should charge it and also check the charging voltage, quiescent current and the stator winding of the alternator. The main fuse could be blown, in which case you should change it. Another possibility is a defective starter relay or starter motor, which would need to be checked.
R
rodriguezbrittanyAug 5, 2025
What to do if my KTM 2015 450 SX-F EU engine turns but does not start?
- D
  Daniel LewisAug 6, 2025
  If your KTM Motorcycle engine turns but does not start, several factors could be at play. Ensure the fuel hose connection is properly joined. If the fuel screen in the fuel hose connection is clogged, replace it. Check if the idle speed is correctly set and adjust if necessary. If the spark plug is oily or wet, clean and dry it, or replace it if needed. Also, verify that the electrode distance (plug gap) of the spark plug is correct and adjust it to the recommended 0.9 mm (0.035 in). Inspect the wiring harness for frayed short circuit cables and check the kill switch for defects. Finally, a defect in the fuel injection system could be the cause, requiring a diagnostic tool to read out the fault memory.
D
David LewisAug 11, 2025
What to do if the FI warning lamp (MIL) lights up or flashes on my KTM Motorcycle?
- W
  Wanda VanceAug 11, 2025
  If the FI warning lamp lights up or flashes on your KTM Motorcycle, stop the motorcycle. Then, identify the faulty part using the blink code. Check the cabling for damage and the electrical plug-in connections for corrosion and damage. It may also be necessary to read out the fault memory using the KTM diagnostics tool.
D
David PayneAug 16, 2025
Why does my KTM Motorcycle engine have too little power?
- S
  Scott SingletonAug 16, 2025
  If your KTM Motorcycle engine has too little power, the air filter might be very dirty, so you should clean the air filter and air filter box. The fuel filter could also be very dirty, so you might need to change it. Additionally, there could be a defect in the fuel injection system, so reading out the fault memory using the KTM diagnostics tool may be required. Check the exhaust system for damage. If the exhaust system is ok, then change the glass fiber yarn filling of the main silencer. Finally, the valve clearance might be too little, so you should adjust it.
J
Jason McdowellAug 21, 2025
What causes my KTM 2015 450 SX-F EU engine to overheat?
- M
  Mr. Gavin Garrison MDAug 21, 2025
  If your KTM Motorcycle engine overheats, it could be due to several reasons. There might be too little coolant in the cooling system, so check the cooling system for leakage and the coolant level. If there is too little air stream, switch off the engine when standing. The radiator fins could be very dirty, so you should clean them. Foam formation in the cooling system can also cause overheating, so drain and refill the coolant. Lastly, a bent radiator hose can be the cause, so change the radiator hose if necessary.
A
Antonio DavidsonAug 26, 2025
How to fix high oil consumption in my KTM 2015 450 SX-F EU Motorcycle?
- T
  Tony FitzpatrickAug 27, 2025
  High oil consumption in your KTM Motorcycle can be attributed to a few potential issues. First, check the engine vent hose to ensure it is not bent; route it without bends or replace it if necessary. Next, verify that the engine oil level is not too high. Finally, if the engine oil is too thin (low viscosity), replace the engine oil and oil filter and clean the oil screens.

KTM 2015 450 SX-F EU Specifications

General

Engine Type	Single cylinder, 4-stroke
Compression Ratio	12.75:1
Transmission	5-speed
Fuel System	Keihin EFI, 44mm throttle body
Ignition	Keihin EMS
Starter	Electric starter
Lubrication	Pressure lubrication with 2 oil pumps
Final Drive	13:48
Subframe	Aluminum
Suspension Travel Front	300 mm
Front Brake Disc Diameter	260 mm
Rear Brake Disc Diameter	220 mm
Ground Clearance	375 mm
Bore x Stroke	95.0 mm x 63.4 mm
Power	62 hp
Cooling	Liquid cooling
Clutch	Wet multi-disc clutch
Rear Suspension	WP Suspension Monoshock
Front Brake	Single disc brake
Rear Brake	Single disc brake
Chain	5/8 x 1/4"
Front Tire	80/100-21
Handlebar	Renthal
Wheelbase	1495 ± 10 mm