MINE CAME WITH A GRP # 6 ,, I RAN 3 TANKS WITH IT THEN PUT THE P 3 IN TO FINSH THE BREAKIN 14 TANKS AND THE HOTTER PLUG HAS A LOT BIGGER TUNNING WIDOW THAN THE COOLER PLUG HAD , I HAVE A HALF A GAL THUR MINE 202 ALL DAY, 93 DREG DAY GOOD MOTOR