Hou_ge2000,
Try searching Google or Altavista for the particular bike -
I know Tamiya made a Honda CB750F in 1/12 scale - actually, it's still in their current catalogue - kit number 14006.....have a look at Tamiya America website on the following URL
http://www.tamiyausa.com/product/plastic/112motorcycleseries/14006.html
The stripes on the tank and side covers were actually self adhesive stickers (very difficult to apply), they were applied and usually clear coated to protect them. I had a friend who's dad had a CB900 Bol D'or - basically the same as the CB750F but with a bigger engine capacity.
If you want some serious reference material I can arrange for my local Technical Bookstore to get a Haynes Workshop manual - they are made for people who own one and want to do major service work on them - they have pictures of everything on the bike - even the insides of the engine and gearbox (probably not needed for a 1/12 scale bike) - email me if you want me to call them to see if the book is available, and for how much -
Cheers,
LeeTree