how often do you change your plugs?

hotrod53

Chief Petty Officer
Joined
Oct 16, 2009
Messages
508
When I got my 1977 500 Thunderbolt 4 cylinder, the original owner said "never go out in the water without spare plugs". Having worked on 2 stroke dirtbike engines for many years, I know that when they run right, the plugs will last a while. Install the wrong plugs or mix your fuel wrong, anything is possible. He didn't have center fire plugs in it but Autolite plugs, which BTW, I had nothing but trouble with in the bikes.

On the water 3 years now with the same plugs, they are the recommended center fire plugs. I'm wondering if I shouldn't consider replacing them just for piece of mind. I pull them and fog each cylinder at the end of the season, I clean them off but they have always looked good. What do you think?
 

MH Hawker

Vice Admiral
Joined
Jul 13, 2011
Messages
5,516
i change mine around 100 hours. Thats about when it starts to smoke a lot.
 
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