2007 Honda VTX 1300 c Will not start

I would suggest that you take it back to the shop that did the modification as it should have been perfect on delivery without the necessity of you having to do any thing to hoses, lines or what ever
basically I am suggesting that the job was not tested or the bike run on a bike dyno to tune and adjust any problems before being handed back to you
talk with the manager and see if you can get satisfaction as a malfunction engine in a bad situation puts the riders life in danger

Have you checked for spark?

tap bowl on carb sounds like float stuck in down position,

Were you able to solve this problem? what did you do? It just happened to me today, topped off the tank, made it 3 miles then it just dies on me. wont start up. Same bike.

This may be as simple as a failed kill switch?
I'd check it out.

Tom

a back fire is to much fuel going down the exhaust and igniting, if you changed the exhaust pipes or allterd the air cleaner you will need to get it set up on a dyno . the air flow meter could allso be playing up a dealer repair really.

You need to pull the gas tank off and find out where it is leaking. I would say it is probaby something simple like a loose clamp on a fuel line.

The pick-up coil next to the stator could be bad as well.