What is the maximum character length for a good product title? And what are the elements not to be specified in the title?[/quote]
What MAV said.
There is no reason to keyword stuff titles on Amazon since there is a keyword section you can fill out that affects the searches. You want enough description to enable those looking for that color/style to find it, and you need to place it in as specific subcategory as possible. Don’t waste space on meaningless adjectives, just essential information. You don’t put size since that is done via parent/child relationships.
If you make it too long, Amazon will truncate it. You do have a little more wiggle room than on eBay titles, just don’t go nuts. Look professional.