First picture is of Dimonfire do not know what number, but is the Cj7y champion equivaliant. Second red arrow is the stock plug. See how the stock plug reaches all the way down, and the Dimonfire does not. I get carbon on the last 2 or 3 threads which makes it really hard to screw in the regular length plug because of carbon. You would have to take the top part of your engine the part that the plug goes into and scrape carbon off to go back to a regular length plug.