It is a Suzuki T500 Titan. It later evolved into the GT500 with an upgraded fork, disk brake and a larger tank.
(according ti this yours is a 1969 or later.
What you have there is a very reliable 2 stroke that was pretty good in it's day. Probably not worth much now, and I bet that parts will be hard to find.
However if it was me, and I had a place, time and some$$$, I would probably do a cafe conversion. Back in the late 60s-early 70s, these were road raced somewhat successfully. I had/have copies of the factory porting specs and exhaust system drawings I got when I attended Suzuki's technician training in 1977.
"The rifle itself has no moral stature, since it has no will of its own. Naturally, it may be used by evil men for evil purposes, but there are more good men than evil, and while the latter cannot be persuaded to the path of righteousness by propaganda, they can certainly be corrected by good men with rifles."J. Cooper
Andyinhilo screwed with this post 05-20-2012 at 03:58 PM