you ride a 125 it's kinda hard to ride slow enough on a 125 and it can take a full day of slow riding to do it but if you start ripping it will get hot enough to clear out I had a bike that fouled a plug once like that I started to keep revs up after that and havnt fouled one sinceno, proof as in, a test showing that if you ride slow on a 2 stroke you will foul a plug.. ive never fouled a plug after ive jetted my bikes.. if you are fouling your plugs need to fix your jetting