My 2012 beta Evo 125 seems to idle a bit erratically at times. Filter is regularly cleaned, carb recently cleaned, plug is new, jitsie idle adjuster fitted, air screw 2 turns out. Basically when cold it idles fast which I would expect then after it warms up idles well and appropriately. Then all of a sudden it starts idling a bit faster then after a bit of a ride the idle goes very slow to the point it dies. I often find it stalls and I'm convinced it has a bit of a bog from closed throttle to open. Could this be the idle jet ? It then seems to change from idling perfectly, to idling fast or dieing. The plug br7es is new and I often find my plug is carbonised but not oily wet.
Any ideas what could be causing this idling ? Could it be the floats need a fiddle with ? Float height adjustment seems a bit of a black art to me.
Does anybody have a recommendation for the needle clip position. I ride at normal altitude in the UK.