I've been using and selling these plugs for years and find them very good on older engines with less than perfect magneto ignition. The one thing people have mentioned is the gaps aren't all the same. As with EVERY plug on the market, you have to set the gap to the one recommended by your engine manufacturer. Set the gaps the same as any other plug by bending the side electrode, and never lever against the porcelain. It's not difficult to get the best out of your engine using these plugs.

Tony, how do you gap those? I have a set of Accuspark plugs that came with my ignition kit and need to gap them. Thanks!