The original plug the factory used was in 1977 Champion L77J4. Bombardier has superceded that plug to either of these two current Champion plugs: QL77JC4 or L77JC4. Used on all 49 cubic inch 3 cylinder engines-60/70/75 hp from 1975 thru 1989. Also used on the same 56 cubic inch 3 cyls from 1989 thru 1993.
