Getting the Most Out of Your JR4 Spark Plugs
If you've been tinkering with small engines for a while, you've probably run into the jr4 spark plug more than once. It's one of those parts that seems so simple on the surface, yet it's the literal heartbeat of your lawnmower, leaf blower, or that old vintage tiller sitting in the back of the shed. I remember the first time I had to swap one out; I didn't think much of it until the engine roared to life on the first pull, sounding smoother than it had in years. It's funny how a tiny piece of metal and ceramic can make such a massive difference in how a machine behaves. ...