fouling spark plugs ? 125 sx ?

My plug just started to be fouled i but a new spark plug in and is still doing it.. and my gas is 1 month old

What colour is the spark plug when you pull it out?.. Leaving the bike idling can cause fouling too, could be loads of things.. Need more detail

I will clean it of one more time the day i put it in it had premix on the piston from putting it back together

What colour is the spark plug when you pull it out?.. Leaving the bike idling can cause fouling too, could be loads of things.. Need more detail

Your carb is running rich.

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