Make sure your mower’s off and the engine is cold before working on it, and be sure to disconnect the spark plug or remove the battery. Add gas outdoors, not inside a shed or garage. Mow up and down slopes with a riding mower to reduce the risk of it tipping over. Mow parallel a...
Local specialist chainsaw shops are also well placed to give advice on the correct plug. What I did when needing a replacement a few years back, was take the plug out and get them to swap it out, like for like. Did the same for mylawnmower spark plugtoo. NGK is a well known brand...