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Newrider 3-
That is the choke heat tube and it needs to be hooked up for the choke to work properly. It should go into the top of the passenger side exhaust manifold. I had to fix mine years ago and there was a kit I got from the auto supply to fix it. IIRC it was in the exhaust section, but I'd just take the pipe with you and ask.
So I went outside and took a look at my carb and found a couple things. First was a yellow vac hose disconnected (busted end) that leads to the distributor along with a red hose. Where on the carb does it connect? Also, there was a steel line loosely connected to the choke? mechanism, with some fuzzy insulation, leading to nowhere with what looked like a broken end. Is this supposed to connect somewhere down by the exhaust?
the hose:
where it goes:
that is the pipe that brings hot air up to your choke from the exhaust manifold.cool air gets drawn through that orange tube,down to the exhaust manifold the air gets heated and drawn up to the choke assembly.you will have to plug off where that pipe comes out of the choke assembly ,cause the way it is now your sucking in dirty air and have a vacuum leak.