I'm rebuilding a 76 shovel and the previous owner put heads on that have two spark plugs and requires two coils (it's a kick/electric start). Can anybody give a info on spark plugs. I have the one's that were with the bike but not sure if they are correct. The plugs that are one side (port) are different than the other side (starboard). The previous owner has passed away and this bike has been sitting for 20 years.