Q. What are the things I should do to make sure my brand new KTM's engine is well maintained - Duke 390?

L**e the chain for every 400-450 kms and use the best available l**e (Eg: Motul), top up your engine oil once it drops the minimum level, keep an eye on your coolant and top up when needed. Try to maintain these 3 things, rest assured you will not be having any issues with your bike. Feed the beast properly as you feed yourself when hungry, you do it and it will take care of you.

Do not over rev it, time to time service, keep checking the coolant and oil level, cleanliness(timely washing), chain l**e and chain cleaning every 500-600 km