Generator / Lighting idea?

Here's my thought & I'm VERY open to input.
I'm thinking a small, exposed shaft motorcycle
alternator. Mounted to an adjustable bracket, with
a small chain sprocket in place of the original
belt / gear. This would take place of my current chain
tensioner. The adjustable bracket will be mounted to
the rear of the seat post. The alternator (serving two purposes)
will charge a small gel-cell battery used for all electrics.
Lights, horn, signals, radio?, speedo/computer, etc.
(minus the engine itself.)
Any thoughts?

HEY 2door!!
How's life? I did find a super small alternator off a '99 to '01
Hyabusa. (The owner wasn't really sure) I'm trying to track
down the numbers stamped on it's casing. It's about 2 1/2"
in diameter by about 4" long with a 3/4" flange. I'm in the
process of drawing up a mounting bracket. I'll keep you posted
as this horrible experiment unfolds. (hopefully I won't de-ionize
the stratosphere) This is the biggest pic I've got thus far.
Take care Tom,

Rob