Just browsing through a few old posts and I thought I would add these
I have had 2 euro spec cb1100f’s and they both had single snorkel airboxs on
I also bought a US spec 1100f rolling chassis a few years ago and that had a twin snorkel airbox on it, also recently bought a twin snorkel 1100f airbox from DK Motorcycles that was from a US import they broke
The 1100f engine also uses the MA3 Conrods, Front MA3 Camchain Guide, and shares the MG5 upper camchain tensioner, the cylinder block looks the same but has a different part number, maybe running different piston clearance?
Keith