Does anyone know what type of spark plug my motor should use?<br />Was running well but I think the plugs are fouled now and I was going to replace them with the type that was in the motor now. I replaced them last summer with a Champion L77JC4.<br />Looked in the book and I see a 5931 or an 811.<br />What should I use and do they need to be Marine plugs?<br />Thanks
