my bike has been making weird noises...

the most recent one is a loud hallow sound while riding around 5 -6 thousand rpms,     kinda sounds like there is really little gas,,, full tank though

second one, is a annoiyng!! hissing noise,,, even there while not riding,  sounds like somethings loose somewhere

third one a puff from  the front clyinder from take off somethimes


any ideas what they can be?

A puff from the front of a cyl. and the hissing I'll bet are related and I suggest inspecting the exhaust gasket of the offending side.