What the others said about the float needle. As for that nut: there are areas on the engine that, from rust and condensation etc, get fused. Be patient with it. Use the right size wrench first and foremost. Hit it with wd40, wait 30 min and try again. Then use wd40 again and try. If that doesn’t do it, hit the wrench with a hammer...lightly just to loosen the nut a bit. Slowly, slowly. If all else fails, hit it with a torch for a bit and then try again.
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