Cirrusly
contributing rider
I have read varying reports regarding putting radiator guards on the 401. I've read that the guard made for the Duke 390 has to be modified, longer screws are required, etc. That very well may be (probably is) true for other year models, but for the 2021 the guard listed below fits with no modifications whatsoever.
I just installed the "Evotech Performance Radiator Guard KTM 125 / 250 / 390 Duke 2017" that I purchased from MotoMachines.com. Their price including shipping was the best that I've found, and delivery was quick. The guard is very well made and looks great on the bike. There are absolutely no instructions shipped with the guard, and the online instructions from Evotech are of little help as they show a radiator shroud and extra bolts and other parts that the 401 doesn't have. I'll outline the installation procedures below. It really couldn't be easier!

I just installed the "Evotech Performance Radiator Guard KTM 125 / 250 / 390 Duke 2017" that I purchased from MotoMachines.com. Their price including shipping was the best that I've found, and delivery was quick. The guard is very well made and looks great on the bike. There are absolutely no instructions shipped with the guard, and the online instructions from Evotech are of little help as they show a radiator shroud and extra bolts and other parts that the 401 doesn't have. I'll outline the installation procedures below. It really couldn't be easier!
- Install the 4 small plugs that came with the guard into the 4 ROUND holes in the 4 corners. Look hard.... they're there but they're hard to see at first. You will not need the two rubber washers. You can actually see the back side (that faces forward) of the 4 small plugs in the picture below if you look hard.
- Snap off the 2 side radiator covers. They just snap off. They may require a little pressure but they will just pop right off.
- Remove the two bolts and washers from the top of the radiator using a 10mm socket.
- Install the guard by slipping the bottom groove under the radiator, then reinstall the two bolts and washers. Do NOT use the rubber washers unless you want to get longer bolts. The guard fits very snugly and does not move or rattle AT ALL without the washers.
- Snap the two radiator covers back on and you're finished! You may have to hold the top corner of the radiator guard in just a little to snap the cover on at the top, but it will snap back on securely without any modification to the guard or cover.








