Old small displacement Suzukis are a novelty, not true collector's items, so it is not nearly as valuable as a BSA, Indian, or other true collector's bike. I have not seen one sell for a while, and you did not say what year or in what condition it is in, but in running condition it is probably worth a few hundred bucks. In near perfect condition it should fetch a couple grand to the right buyer- old, small bikes like this do not have mass market appeal.
Generally, unless you have the skills and money to restore an old bike to showroom perfect condition, you are better off leaving it alone. Incorrect parts, non-original paint, and other mods usually bring down the value. The value is in the fact that it is old and original for someone into collecting old bikes like this, not in it being a popular model with someone looking for a bike to ride.
