Yup you need the clip or the needle can move and change air to fuel ratio.
The gear box takes gear lube, there's a bolt on the left side almost even with the axle input, you take it out and fill it till gear lube spills out.
That sensor is your reverse sensor, it limits the engine when in reverse.
It would probably run worse with the exhaust taken off unless it's clogged.
Yes a fouled plug will make a 2 stroke run like crap.
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