I have an akai aa-a25 reciver and right side speakers only work

We have TV remote codes available but not for this type of audio gear. Sorry.

Sorry we do not have these kinds of codes, only for TV's

I'd troubleshoot first, even though you've already tried the headphones (good thinking). Get a battery (AA battery works) and put the black and red wires on opposite sides to see if the speakers are working.
Is there a menu of settings on the jvc, and is it set to 5.1? Just trying to help...

Hello
Check the speaker of the right side first for damage. Connect it to left side and listen whether it works or not. If it works with left side, make sure that the audio output section circuit to the left side inside your amp has damaged and should be replaced. If the speker does not works with connecting it to the right side, make sure that the speaker has damaged. OK.

first turn the actual volume up on that channel on the reciver then make sure your speaker wires in the rear are using the same lenght each

No you don't really. The good channel will tell you everything about the bad channel as it should be the same. For instance you can measure voltages and compare them and if you prod the good channel and get a loud buzz at various stages. Then you should also get the same results with the bad one. Work backwords from the speaker terminals. Buzz on good Buzz on bad section is working. Buzz on good nothing on bad. Faulty stage. It's not likely to be the power supply as that would affect the other channel.

Hit the button  "speakers/a/b/off" on the left hand side of the front panel until it shows that "speakers b"  are turned on.

the problem you have seems to be on programing the master effects to get to it go to main menu and see the distribution and effects you want to hear on you home theather.remember that home surround needs some decoders to send the sound where the images come and its right built in....

The first thing I would check has already been done, the only other thing would be fuses. I am preety sure there is a protection fuse at ever channels output to protect against a dead short. I am sure you have already fixed this problem but I thought I would give it a try. Let me know what you found.

So your saying that you have no rear channel. Some recivers use a single stereo output ic for both sides on the rear speakers. you could have a defect with this IC . Anther thing Im sure you check3ed the obvious ie : the switch is on suround sound? If there is a front to rear fader is it in the middle? Good Luck