Cheers team for all your thoughts
I did use cheaper premix oil than normal so fits with what Sly was saying the reason it is coming out of the exhaust port.
The brass ring and O rings are around 12 hrs of running old.
(10 hrs only for the O rings - no wonder the dirty 5 had none when i got it.)
Oil still comes out of elbow with synthetic oil so will look at all suggestions.
The guy I bought it off said he replaced the needle with a number 7 (pretty sure that was the size - will look around on computer history to confirm soon)
Have mixture screw set at 1 1/4 turns out
Big mystery now is where is all the gearbox oil been going that i have been feeding the gearbox - use to think when I was greener than I am now that the oil coming from the elbow was gearbox oil as it always seemed to drop.
Have read before the gearbox oil eye level glass is tricky on the KX - but even after having bike upright for 5 mins still looks like it needs more oil - must have put in a few litres over 20 hrs of use.
Can anyone tell me please how much oil the gearbox takes from bone dry to bring the oil level up to half way on the eye level glass ? Is the gearbox meant to consume oil ?