AJS & Matchless Owners Club

Should I replace the plugs that are c. 25 years old, they haven't done many miles at all but are obviously pretty old?

There are plenty of people trying to source new old stock plugs to use in their bikes so age alone should not be an issue, however spark plugs are relatively cheap so its not a show stopper to change. You could buy a pair, gap them and put them in your tool box with a plug spanner, if the originals fail when you are out its a few minutes to swap them over and you have avoided subscribing to the throwaway society.

Thanks Duncan, appreciate your suggestion.