I run open pipes 18" turn downs no baffles. Some popping is to be expected with open pipes but mostly should grumble. If it starts good when its cold and in cold weather like in the 40s then you are probably close. It sounds like it was rich with the stock pipes on. Here is a jet calculator. http://dinqua.com/Triumph/Executables/JetCalculator2010.exe

I have no faith in human perfectability. I think that human exertion will have no appreciable effect upon humanity. Man is now only more active - not more happy - nor more wise, than he was 6000 years ago. Edgar Allan Poe