If it has the fully adjustable front forks (blue anodised adjusters?), remote reservoir rear shock, magtek wheels and a dry clutch you're probably most of the way to an SP. External paint won't help too much as it may have been resprayed, however if you look under the seat you may be able to tell if the rear unit is from a Rothmans bike. It may also be possible to run the frame # through Honda to check. A picture is worth a thousand words, so if you post it up, it might help.