Hello, after doing co adjustment ie altering co with buttons on dash I have bought a booster plug, I wrote down original setting for my xt before adjusting which was 15 .My question is that since I bought my xt second hand how am I to know if previous owner altered co before I got the bike? the snorkel has been chopped and drilled so he's been messing.Is there a way to set co back to default ? perhaps disconnect battery ? so that's the question,thanks in advance,,Tommy Tickle