Originally Posted by Stang951

I was taking my Jackpot stainless header off today to have it ceramic coated during the week. Rear O2 sensor was givign me hell so I heated it up...no go. Used some penetrating oil, let it sit a few hours...no go. Then tried wax and got it to come out....BUT...the threads are stripped and galled on the sensor. The threads in the bung look ok but maybe a little dirty.

Does anyone know what size the large sensors threads are so I can go buy a die for the bung tomorrow? I figure that I already have to go buy a new o2 sensor so the cheap price I am getting on the coating is going to now negated by the sensor.

Originally Posted by Melman

Does H-D have 2 different size sensors? Not debating, just asking.

Originally Posted by ultra_classic

14mm or 18mm the same as spark plugs, and you can take it to a Muffler shop and he can weld in a new bung if its pooched

Originally Posted by Bohacker

I think the 18mm bungs are for wide band O2 sensors used for the more advanced auto tuning options. Stock headers only have the 12mm bungs.