Atomic 4 exhaust
Bob, If you have an Atomic 4, you need to know about Moyer Marine. I can't post a link, but Google will find them for you. Don services the Atomic 4, sells parts, and has technical tips and a very active forum on all things Atomic 4. If you can't find an Atomic 4 answer there, I doubt there is an answer. Good luck, and have fun diagnosing and fixing your problems.