Going to repeat the same message here, but as said a few times above. DO NOT CHANGE IT YOURSELF. There are people around that will tell you to just go ahead and do it, it's easy. That's true it is easy, but think about this. You could go down to the gas station and fill your tank and drive away without paying. You would probably get away with it, but are you 100% sure you wouldn't get caught?? Legal issues aside, changing the crystals could de-tune you radio to the point that it doesn't function 100%. This is like the legal part of it, you would more than likely be fine doing it yourself, but is it worth the chance of it reducing the range of your radio? Think about this (you may not have planes this expensive, but I'm making a point.) --- Dave Patrick Ultimate Bipe-$400, YS 140 4-stroke engine-$550, misc parts-$100, high torque servos - $225, Airtronics flight pack-$115. That's almost $1,400. Cost of sending your radio in to have it retuned - $30+shipping. In my book it's cheap insurance to losing the plane.

IMHO those who tell you to do it in spite of the laws and common sense are acting irresponsibly.