I just clean the carbs and rejected the Jets, and put a new spark plug, I’m having a hard time starting it up, The spark plug works but I ordered a new one and will throw it in soon, I’m on here looking for ideas to get it started, I don’t now how to check the compression but I would like too, the previous owner put in a new top end. Any idea on how to get this thing started. Thanks in advance anything helps, and is expensive to bring to someone to look at it, I want to learn myself and am pretty mechanically inclined