I need to replace the short radiator hose which goes to the front cylinder as it is weeping just enough to be annoying. (see attached photo, #11). Hondasportpartswarehouse.com has this one, but apparently not the two Carb heater hoses. Does anyone have recommendations of vendor sources? I'd like to replace all this old rubber down here while I'm in there. Also, I am having trouble deciphering the specific heater tubes which go in and out of the carb assembly, versus the short water hose between the halves. I think I need #22 and the one which connects to "E17"? Is #18 the one which links both halves? See diagram here. Or is the other carb heater hose #1 from the "water pipe" diagram? So #22 E18 and #1 E17?

Thanks for any insights.

 

I eliminated coolant going to the carbs. Ran a hose from the thermostat to the water pump. This removes several connections and lengths of hose that can fail. That was my thinking anyway. Is it a good idea? So far I haven't noticed any down side. In cooler weather does the mixture go a little richer? I don't know, though likely. I can't feel any difference that I can attribute to the lose of heat to the carbs. I live in at 5k feet. The engine feels stronger when the temps are cooler and dry. Would it be better with carb heat? Maybe.
Another point to consider is I live where it's warm to hot a lot of the year.
Something to look at while your in there is the coolant expansion tank. They are plastic and 20 something years old. Mine had a hairline crack along the molding seam.
Your right, this doesn't help with identifying the hoses.

 

I just decided to YOLO and buy the AS3 silicone hose kit. Replace all that old rubber and be done with it.
Good call on the expansion tank! I'll double check it.