New to me engine had no spark. PO told me the power pack was bad. He had replaced the trigger with a new one but the pack was not producing spark. I had a good used pack to replace the bad one . Installed the replacement . Pulled on the starter and had spark in both cylinders. I was a happy camper was a few minutes. I only pulled a few times when one cylinder lost spark. I am hoping I did not ruin the pack . I switched coils and determined that the pack is not producing spark for one cylinder. I am curious if a bad stator or trigger or something would ruin a pack after just a few pulls to the starter.