well, the coils will be "rated" at whatever they've been spec'd to reguardless of what motor you put it on. However, heat dissapation is another problem thrown into the mix as well - the coils could take whatever you throw at them electrically, but its thermal dissapation will depend alot on the motor structure's ability to get rid of it. One quesiton though, do you even know if the apx coils fit the motor gap?