Hey, im new here and looking for some badly needed help in order to sort out my bike and anger of it constantly not firing up n running battery down

, well anyway if you could be so kind as to give me some advice... i bought a honda vf 750 1983 off my mate he bought it off some else in bits he put half of it together n then couldn't do anymore. when i had it i had to re-build the carbs as the owner done a service on them and lost all the springs so i had 2 buy 3 sets of carbs to get all the springs i needed, now carbs are on i got it sort of running the other day but the metal plate the carbs bolt on to was back to front. i took it back off n turned it round to fit n now it wont start. its sparking fine and plenty of petrol getting to cylinders. it just keeps turning over. theres a pipe that looks like a fuel pipe loose going to one of the front carbs but i cannot see where this goes i've put a pic up of this, any1 know why this bike will not start or could you point me in the right direction
Photo-0359.jpg - Image - Photobucket - Video and Image Hosting
you can see the pipe next to the carb on the right hand side
thanks
Lee