I cleaned the carb out on my Onan 19.9 Hp last night (it was running horrible) and after I got done it would not start. Well I figured out what the problem was. I installed the float upside down. I reinstalled the float and now it's getting WAY WAY to much gas. I believe I may have bent the needle tab whenever I installed it upside down. Now I believe the float is hitting the top of the carb and does not interrupt the flow of gas going into the carb.
If y'all can think of anything else I could screwed up please chime in. Im not familiar with these motors and I may have missed something.