Hi ericeffs,

This suggestion is from our FAQ on the 14MZ from our website, it should give you some ideas of things to check before sending the receiver in.

Things to look for are metal to carbon or metal to metal seems to be the worst source of noise. Any place where there is a loose bolt or screw and metal or carbon parts are allowed to rub against one another can create noise and make the receiver unhappy. Some examples of which we are aware include loose muffler, muffler rubbing on carbon or metal frames, loose bolts on the motor mount, loose boom struts where they attach to the frames or tail boom, bearings rotating in bearing blocks or other parts like a bell crank or bell mixer, loose bolts where the struts attach to the lower frames, a bolt of excessive length touching another part -- especially one that is rotating, etc. A loose connection between carbon parts can be a problem too. Have you tried filters on your servos? If not we would suggest starting out one at a time, adding a filter, and then re-range checking your craft.

I hope you find this information helpful. You can also reach our Futaba support team at 217-398-8970 opt 2, or via fax at 217-398-7721.

Sincerely,
Krysta Hunt
Product Development & Support Specialist
Futaba Service Center USA