elitefisherman14 5 #1 Posted March 5, 2018 What spark plugs should I use in my '79 B-81? I took out the original and it is a Blue Crown M5, all searches led to "vintage" Blue Crown plugs so I don't think they make them anymore. All I know is that the proper gap is .30 in. Share this post Link to post Share on other sites
elitefisherman14 5 #2 Posted March 5, 2018 11 minutes ago, elitefisherman14 said: What spark plugs should I use in my '79 B-81? I took out the original and it is a Blue Crown M5, all searches led to "vintage" Blue Crown plugs so I don't think they make them anymore. All I know is that the proper gap is .30 in. Nevermind, I found it 2 Share this post Link to post Share on other sites
Ed Kennell 35,487 #3 Posted March 5, 2018 (edited) Good deal. Just don't set the gap to that three tenths of an inch. Edited March 6, 2018 by Ed Kennell 3 2 Share this post Link to post Share on other sites
