TM 125 going through a lot of spark plugs

[TM125 shane.]

hi can any one please tell me why my bike is using a lot of spark plugs they are fouling a lot i went through 2 last Sunday and 2 the week before they seem to be very oily I'm using br8es plugs. any advice is appreciated

 

[Backslayer]

Your bike needs to be jetted it sounds to rich.