I hav a 1995 honda cr 125 it has spark and is getting fuel and wont start but back fires the odd kick, ive replaced ign control, cdi box, rotor and generator, coil and plug

The distributor must not be timed right.

Sorry but they either work or they dont.
If yours isn't working, replace it.
But before you replce it consider checking the other components, because ign mods are exspensive.
it sounds like you've been already checking the other stuff. heres what i'd check if your bike came to my shop.
1. battery fully charged, and can take a load. (weak batteries = weak ign power)
i have a bike that won't fire at all with weak battery. Make sure battery is good.
2. check for spark at plugs, make sure plugs are good. Pull plugs and turn motor over.
rest plug next to head and turn over, do not touch the plug while turning over
or you can be shocked.look for spark.
if you have spark , then you ign mod is working.
if no spark, then check #3
3. power to coils. check the power going into coils,
if power but no spark, then coil is bad.
if no power. check #4
4. power to coils comes from a ignition system ( points/ cdi /ign. module)
there is a stator and a rotor. and a signal generator. on your motor
the signal generator wire sends a signal to the cdi, every time the rotor rotates.
the ignition system (ign.mod) sends power to coil.
so if no signal to the cdi, then signal generator is bad
if signal going into cdi but not sending the power to the coils then the cdi/ ign. mod is bad.

Hope that helps
Best Regards
Big Al

CLEAN THE CARB AGAIN IF IT RUNS ON STARTING FLUID ITS NOT GETTING FUEL YOU WILL NEED TO REMOVE THE JETS AND MAKE SURE THEY ARE CLEAR

DEPENDS IF YOU HAVE SPARK OR NOT,IF NO SPARK IT COULD BE YOUR STATOR/ IGNITION, HAS TO HAVE SPARK TO FIRE THIS IS WHERE I WOULD START FIRST

Check the CDI-box. Then the spark-plug wire. You could remove the tank and the seat to see the CDI-box.

Check the rectifier.

You will have to perform some basic checks like tht of sparks reaching the spark plugs and tht the fuel too enters the combustion chamber, wth your explanation it seems fuel is not entering correctly into the combustion chamber... you will have to clean the carb/s.

The voltage on the coils is present except at the instant of firing. The interruption of the voltage is what causes the coil to fire. The cdi box is what causes the voltage interruption.
The interruption is very hard to detect. You are not the first to be stymied by that box. If you have access to an oscilloscope, I think you can see the pulse if it occurs.

Where is the cdi box located??

Purchase a shop manual from local dealership and in that will have all the ohms resistances in there. Test all electrical components before buying anything to be certain it is what you need.