I stopped using these in the early 90's because they are crap and would just quit when conditions were not perfect. So I have not bought any since....The other day my ATV needed a plug, and Napa sells me an NGK plug even after I protested....They say they are good now.

Well I went to install the effing POS plug and what happens, it breaks in half right at the threads....The threaded part in down in the bore, and then entire rest of the plugs comes out....electrode and all...Anyone ever worked on an ATV...there is no room in there to work. This sucks, and it wasn't even tight yet..

NGK still sucks!!!!!!!!!!!

PS....Why do you think I was changing the plug in the first place...gas went bad over winter, even with stabilizer, and it had an NGK plug that stopped firing...Other ATVs with same fuel, no issue...