Originally Posted by
smoothie7
Great thank you very much. I just ordered a couple of FS versions

A gotcha with the R603FS vs the R604FS...you have to change the RXSYS in your 4PK menu:
There are two types of Futaba 2.4GHz receivers for cars depending on the system differences:
C1 type and C2 type. The R603FS and 603FF are C1 type and the R604FS
supplied with the 4PK set as standard is C2 type. For the R603FS and 603FF, set RX
TYPE to "FASST-C1" and for the R604FS, set RX TYPE to "FASST-C2".
So when you want to run your model with the R604FS, set to C2 and power cycle the 4PK. When you want to run the models with R603FS, set to C1 and power cycle the 4PK. Kind of annoying. Makes me want to either trade my 603's for 604's, or my 604 for a 603.
You do only have to bind each RX once though.