Brigges 18hp problem need help

I have a 18hp bridges & Stratton engine on an old ranch king garden tractor I got it on Craigslist for $50 it was seized I fixed that the piston holder was Lose so i tighten it and it is making a loud ticking nose and maybe only running on one cylinder? I have a video of it on YouTube making the nose my you tube Channel is Cody Cody