This last piece of advice applies to the 700 series, 900 series, KM300 series. 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 yourself another tear down, by simply replacing the lot. Look for "Kenwood Chef" "repair kit" and make sure you pick the correct kit for your mixer. 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. If you look at the capacitors, they are often cracked, some time almost split in two as a result of the issue. More heat means burning smell, and smoke eventually, even though the brushed motor appears to be functioning normally.
Power varies with current squared x resistance, if you remember from your school Physics classes. These can start to increase in ESR as they age and degrade, and thus, since the Equivalent Series Resistance increases, they dissipate more heat. I would suspect that the capacitor (or capacitors, depending on model) for the motor is/are the fault.
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