Now you’ve gone and mentioned carbs.... Look at the pics below of an early 961 (actually a 952) by Kenny Dreer, he set them up with 39mm FCR Keihin flat slides. And I just happen to have purchased a set from him a little while ago. I’ve got a pair of 35mm FCRs on my ‘old’ Commando and they’re fanbloodytastic! I think it best to wait until it’s out of warranty before playing around with them on the new ‘un though eh?!