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Correct oil change on your KTM 125 Duke

To ensure that your KTM 125 Duke runs reliably for as long as possible, a regular oil change is essential. We show you how to do it and what to look out for.

The engine oil level
Before we start the oil change, it is important that you understand how to check the engine oil level correctly. This will give you an early warning if your motorbike is running low on oil or if you have not filled it with enough oil. 
  1. Make sure the motorbike is warm to the touch and park the motorbike on a level surface, the motorbike must be absolutely straight.  
  2. Wait about one minute after stopping the engine, then check the oil sight glass on the right side of the engine
  3. The engine oil level must be between the top and bottom of the sight glass, ideally around the middle.  
It is especially important that the engine is warm and that you wait a short time after switching off the engine, otherwise the values can deviate considerably.

The oil change
The oil change on the KTM 125 Duke is no trick and can be carried out easily even by beginners. For this, the engine should also be at operating temperature so that the oil can be drained as well as possible. Our tried-and-tested oil change kits are particularly helpful for this, as they provide you with the right oil, the right oil filter and the necessary sealing rings at a reasonable price.

So that you don't have to choose everything individually, we have already put together practical oil change kits and oil filter kits for you, which we would like to introduce to you below. The oil change kits already contain the ideal oil, both oil filters and all seals. The oil filter kit contains the two oil filters and all seals.

First, start by removing the front spoiler. To do this, loosen the two screws on the front and four on the underside and remove the nose spoiler. 

Now make sure that you can carry out all the work in a suitable place. Oils, greases, fuels and contaminated materials such as old oil filters cause environmental damage and must never be disposed of improperly. 
  1. Put the motorbike on a suitable surface on the side stand and place a suitable container under your motorbike. Our recommendation: a suitable oil change tray, which you can find here, for example. 
  2. Remove the oil drain plug with O-ring, as well as the oil strainer and let the engine oil drain off completely.
  3. Clean the oil drain plug and the oil strainer thoroughly. If larger collections of chips and abrasion have landed in the oil strainer, this could be a sign of impending engine damage, in which case you should immediately visit a specialist workshop. Small amounts of abrasion, on the other hand, are normal and okay. You can clean the oil strainer and the oil drain plug with the help of a suitable brake cleaner - inexpensive and reliable.
  4. Now you can remount the oil strainer and the oil drain plug with new O-rings, tighten the oil drain plug with a torque of 15 Nm. 
  5. The next step is to change the oil filter. To do this, we remove the two screws from the oil filter cover and remove the cover with the O-ring. You can then easily remove the oil filter with a pair of circlip pliers, but if you don't have any at hand, you can also do this with a simple screwdriver and a little dexterity. The oil filter must be pulled out of the housing. Then drain off the remaining oil and clean the sealing surfaces and the oil filter cover thoroughly, you can use brake cleaner again for this purpose. Tighten the oil filter cap with a torque of 8 Nm.
  6. Now it's time to fill in the oil. To do this, remove the oil filler plug with the O-ring and fill in the correct amount of engine oil. Then refit the oil filler plug, start the engine and check your engine for leaks. If everything is tight, fit the front spoiler and check the engine oil level again. Have a good trip!
Motorex Engine Oil Formula 4T 15W/50 1l
Motorex Engine Oil Formula 4T 15W/50 1l
Modern semi-synthetic engine oil for 4-stroke motorbikes in the usual high Motorex quality. This oil offers good protection of the engine, gearbox and clutch in all areas. good wear protection provides for constant consistent temperature for oil bath clutches (JASO MA release) Specifications: JASO MA2 T903:2006; API SL, SJ, SH, SG About Motorex Motorex is a Swiss premium oil manufacturer which was founded in 1917. Known for some of the highest quality oils on the market, Motorex is represented in more than 85 countries worldwide and works with countless motorbike manufacturers and racing divisions. Environmental information and disposal:After use, motor oils should be disposed of at a used oil collection point. For proper disposal, you can send us your used oil up to the quantity you purchased from us (according to the invoice) for free and proper disposal or hand it in personally (arrange an appointment in advance). The oil must be returned in its original or equivalent packaging, without any foreign substances such as brake fluids, coolants or solvents. As Altoel is a dangerous good, there are special shipping regulations! The costs for this are to be borne by the purchaser. Improper disposal of aluminium oil endangers the environment!

€14.95*
Motorex Engine Oil Formula 4T 10W/40 1l
Motorex Engine Oil Formula 4T 10W/40 1l
High-quality semi-synthetic engine oil for 4-stroke motorbikes in the usual best Motorex quality. Provides good protection of the engine, transmission and clutch in all areas Designed for models with fuel-injected engines and with catalytic converter Optimum cold-start properties Temperature resistant Specifications: JASO MA2 T903:2006; API SL, SJ, SH, SG About Motorex Motorex is a Swiss premium oil manufacturer which was founded in 1917. Known for some of the highest quality oils on the market, Motorex is represented in more than 85 countries worldwide and works with countless motorbike manufacturers and racing divisions. Environmental information and disposal:After use, motor oils should be disposed of at a used oil collection point. For proper disposal, you can send us your used oil up to the quantity you purchased from us (according to the invoice) for free and proper disposal or hand it in personally (arrange an appointment in advance). The oil must be returned in its original or equivalent packaging, without any foreign substances such as brake fluids, coolants or solvents. As Altoel is a dangerous good, there are special shipping regulations! The costs for this are to be borne by the purchaser. Improper disposal of aluminium oil endangers the environment!

€14.95*
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