Briggs & Stratton spark plugsModelHEX sizeGap49105516.0 mm (0.629 in)0.9 mm (0.035 in)491055S16.0 mm (0.629 in)0.9 mm (0.035 in)Platinum506616.0 mm (0.629 in)0.75 mm (0.030 in)
