Answer to: Burning Smell but speed no problemThe burning smell is unlikely to be the motor. Google for "Kenwood Chef A701 speed controller repair" Try http://howtomendit.com/answers.php?id=45... The most likely source of the burning smell is a failing capacitor of overheated resistor, but those two links will give you more details. Repair is relatively simple, but you will need to replace some components, and the ability to solder is required. These machines, unlike their modern equivalents are designed to be relatively easy to service.
Answer to: Burning Smell but speed no problemI would suspect that the capacitor (or capacitors, depending on model) for the motor is/are the fault. These can start to increase in ESR as they age and degrade, and thus, since the Equivalent Series Resistance increases, they dissipate more heat. Power varies with current squared x resistance, if you remember from your school Physics classes. More heat means burning smell, and smoke eventually, even though the brushed motor appears to be functioning normally. If you look at the capacitors, they are often cracked, some time almost split in two as a result of the issue. While you have the machine apart, I would also replace the parts listed in one of the many ebay sellers who specialise in this kind of thing. Look for "Kenwood Chef" "repair kit" and make sure you pick the correct kit for your mixer. You might save a few pennies by identifying the exact component on your machine, but the other capacitors, resistors (and perhaps triac, depending on model), will probably fail eventually, so you might save yourse...