MOTOR - SPARK PLUG QUESTION HELP.

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HERO MAJESTIC PANTHER- HAD SINCE NEW AND MY PROBLEM IS MY SPARK PLUG WHITE PORSALIN IS ALWAYS SUPER WHITE. IVE TRIED A COLDER PLUG AND STILL THE SAME. IM RUNNING REG GAS AND IVE TRIED SUPER UNLEADED BUT STILL THE SAME. I ALSO USE 4 OZ . OF OIL PER GAL . B/J AT HANDY BIKES TOLD ME TOO. IM WONDERING IF I NEED TO USE A LARGER MAIN JET ????????????? TO ME ITS RUNNING LEAN FROM THE LOOKS OF THE PLUG . ANYONE HAVE ANY THOUGHTS TO THIS PROBLEM. ?????? ( 1700 MILES ON MOTOR NOW) THE JET IN IT NOW THAT CAME WITH MOPED IS A # 51. ALSO IVE ALWAYS HAD SPARK KNOCK AFTER 25 MPH. SINCE MOPED WAS NEW. IVE TRIED TO MESS WITH TIMEING BUT STILL THE SAME. THANKS GUYS, DOUG IN TEXAS.

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