I have a 2005 heritage that is carbureted. It ran perfectly fine. No issues. I parked it for the night. The next day I went to start it and it sounds like it has a knock in the front cylinder. When I start it and at idle it has the knock but when giving it gas it runs great. No issues at all. I replaced the gaskets between the carb and intake and the intake and heads. To me it sounds like it isn’t getting fuel. I am ordering a fuel filter tonight. I didn’t know if anyone has had this problem before.