Unlike extending the battery leads, there is no noticable side effect to extending the motor leads. There will be a small increase in effective motor resistance that reduces the electrical efficiency a fraction, but adding a few inches of thick wire will be an insignificant increase compared to the motor which if it is of a high turn count may have meters of thin wire inside it to function.
I have extended motor leads by about 2' with no noticeable ill effects on an EDF plane that needed the battery in the nose for balance and the jet near the tail.
If you have a good soldering iron and the skills/balls, the best way to do it is to remove the motor wires from the ESC, and replace them with longer ones. If not, you can remove the connectors from either the motor side or ESC side wires, solder on the extensions you need, heat shrink the joints, and add the connectors you removed back on to the new ends.
Paul Upton-Taylor, Greased Weasel Racing.
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