How To Change Coolant in KTM Duke 250 Gen 3 | Step-by-Step Air Bleeding Process Explained, by Jagdish More on YouTube. 6 min 16 s.
- Video length
- 6 min 16 s
- Time to do it
- 45 minutes
- Difficulty
- Medium
- Steps
- 9
What you need
Steps
Park the bike on level ground and let the engine cool completely. Do not open the radiator cap while the engine is warm.
Put the drain pan under the water pump and remove the drain bolt with a socket. Let the old coolant run out fully.
Refit the drain bolt with its washer and torque it snugly. Do not overtighten it into the alloy casing.
Fill the radiator with RO or distilled water through a funnel, run the engine briefly, then drain it. Repeat until the water runs clear.
Fill the radiator with fresh coolant to the top of the neck and fill the expansion bottle to the marked level.
Start the engine and let it idle with the radiator cap off. Squeeze the coolant hoses gently to push trapped air out.
Top up the radiator as the level drops while the engine warms. Refit the cap once the level stays steady.
Let the engine run until the radiator fan switches on, then check the fan spins and the temperature gauge stays normal.
Switch off, let the engine cool, then recheck the radiator and expansion bottle levels and top up if needed.
Tips and common mistakes
Never open the radiator cap on a hot engine, as pressurised coolant can scald you.
Use the correct coolant type for your bike and mix it as the bottle says, not tap water.
Check for leaks around the drain bolt and hoses after the first ride.
Old coolant is toxic, so collect it in a sealed container and take it to a recycling point.
Questions
How do I know if air is still trapped in the cooling system?
The engine will heat up fast and the radiator fan may run constantly. Idle the bike with the cap off and squeeze the hoses until the level stops dropping.
How often should I change the coolant on a Duke 250?
Most owners change it every two years or around 20,000 to 30,000 km. Check your owner's manual for the exact interval.
Can I use tap water to flush the radiator?
Use RO or distilled water instead. Tap water leaves minerals that can clog the radiator and reduce cooling.
This guide was drafted from the video's details and general task knowledge. It has not been checked against the full video. Check the video and relevant product instructions before following a procedure. Report a correction.
