Champion RC12YC vs. 3071 spark plug
I bought a Sears lawn tractor last year with the Kohler SV610 engine (21 HP). The spark plug model is listed on the inside of the hood - RC12YC which is different than the one listed in the manual. When I finally changed the spark plug, it had the Champion 3071. Are these equivalent and how do they compare? The 3071 was gapped at .030 and the RC12YC comes new with that gap. There is no information in the manuals for the gaps with these models of plugs. I presume the manuals cannot keep up with the model changes and engine permutations.