recently purchased 2008 sport cub, love it…

and just completed a very extensive annual…

has 1100 total time, engine has never been topped or overhauled…

noticed when I test flew it that the engine made a popping noise, sort of like a backfire, several times a minute while taxiing…

ask the seller about it (an FAA certified repair station in California), they had maintained that airplane since new, and the owners response was “it has always done that…”

so my questions are:

do they all do that?

if not, is there something that needs to be looked at or adjusted on my engine?

thanks