I purchased a motorized bike kit and it worked fine until I tried to start it up...

[Shean]

...today. Does anyone know...? what is wrong?

It used to make a sound like any normal engine would until this morning now it is making a sound like air being pushed through a small hole. Needless to say it refuses to start. How can I fix this problem?

I have tightened all of the head bolts and checked everything that came with it to ensure everything is tight and well fighting, nothing is mechanically wrong on the exterior. A friend told me the head gasket may have broken. Does anyone have any ideas?

[flash84]

Sounds like your exhaust gasket is blown. For tips and techniques with motorized bikes check out the forum MotoredBikes.com: Motorized Bicycle Forum - Gas & Electric Bikes