Have you seen copy of service manual? I checked it, but didn't really describe where carb coolant hoses go. I got mine back on correctly because the lower inlet on the side of the carb has a 90 degree bend in the hose, so was easy to put back on the way it came off. If your lower hose doesn't have the bend, then this hose comes from the front of the thermostat housing, if you know what/ where that is. Anyway, that's the way mine was routed. Cheers