Help me identify this bike

[Gravy]

I was going through old pictures.
Saw this a bunch of years ago:
Help me identify it, I thought is was pretty cool, looks like it would weigh almost nothing.

 

[jentzschman]

Whatever it is, that is a pretty cool looking machine! Gas tank built into the neck of the frame?

 

[Jesser04]

Here you go.

http://www.moto-scoot.net/sachs_madass_125.php