Kenwood KM305 Stand Mixer - Answered Questions & Fixed issues

Take it back for an exchange. It is defective.

Can't refer you to a dealer there but it is likely that only the motor's brushes need to be replaced. This isn't a difficult DIY job and the brushes shouldn't cost more than ~ $20 US.
You could also remove the housing covering the motor and see if the commutator is visible. This is a segmented copper cylinder and shouldn't be completely blackened although some signs of black is normal. The brushes ride on this cylinder and if the brushes have become too short, it can cause arcing and smoke. Clean that surface before installing new brushes and they too may smoke and cause rough running until they are worn in. The brushes can be had many places so you will have to choose one convenient to you:
Kenwood Chef Brushes

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HI.When the stand mixer produces a popping sound during mixing this problem has something to do with the motor.Motor has bossing on it.This might not be lubricated well and eventually lossen up.That's why it produces a popping sound.And with regard to the burnt smell might be on the coil of the motor's rotor or armature.Is the unit still functioning eventhough you smeeell burnt wire?Thank you for choosing FIXYA..

are there any sounds or noises when you turn it on