Hey there, okay so I reinstalled an original carburetor off of a different fa50 same thing runs exactly the same as the chinese carburetor. I currently have it running on mixed gas and just left the oil pump there but removed the oil tank....I had some gas leaks which I took care of and also had an electrical issue but all of that has been fixed. I am literally tired of working on this thing lol. I've replaced I think every part. Changed the case oil today. It could be an air leak that's something I've not checked. Any idea which lines those are or how do I check for air leaks?