Could be the Mechanical heat source Tube pickup for the Choke system! I'm not sure what these came with from the Factory. Looks like an added Electric Choke now.
So I can plug it right. Not needed? I don't see a place that it would connect to. I've replaced all hoses, boots, spark plugs, and check valves. So I'm about to adjust choke and carb.
No, it's not needed. It just helps, especially in cold environments.
I ran mine without it for a long time. Just make sure your electric choke is up to par.
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