Champion RC12YCMP Resistor Spark Plug

A tired spark plug shows up as hard starting, rough running and wasted fuel. Dropping in a fresh Champion sorts all of that for the price of a coffee or two.

Champion resistor plugs are a proven pick for four stroke mowers and small engines, with a copper core for steady heat transfer, a projected tip for a clean burn, and a resistor to keep ignition interference down. The gasket seat and 14 millimetre thread are the common small engine fitment, with a 19 millimetre reach and a 5/8 inch hex.

Worth knowing, plugs are not one size fits all. Check your engine manual or bring your old plug in so the thread, the reach and the heat range line up. A yearly plug change is one of the cheapest ways to keep mower and garden gear starting first pull.

Full specs and fitment are in the tabs below, and we are happy to check the right plug with you in store.