A35 coked up exhaust port and pipe

Turbo 124 /
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So I managed to get my exhaust pipe off my TX50 using this wrench:

Don't know why I didn't think of it to begin with. DUHH..

Anyway here is what I found in the exhaust port:

The port looks really coked up but it's not. The exhaust port is tapered like that. See below.

Exhaust pipe/muffler:

I ran the bike without the muffler and it runs better and doesn't smoke (as bad) but will sometimes stall at idle. Probably from not running an exhaust and it's sucking in some air.

So is this carbon buildup considered bad? Or would cause excessive smoking?

What's weird is the intake port is 17mm. The exhaust port is about 17mm as well but the hole at the jug is much smaller then tapers toward a larger hole. Is this meant to be some sort of a restriction or is there a reason for the exhaust port to be shaped like this. Does that make sense? (edited)

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