Osprey and motorcycle stuff rang a bell with me, but I have had a good look myself and they only seem to do military books. I could suggest my own work as featured below, but as the title suggests it doesn't have much to do with motorcycles! (Well there is one bike in it, but that's all)
And as soon as the garage is above freezing for more than a few hours I'm going to tear the CB engine to bits. I am getting restoration withdrawal!