English to German Tech/Engineering Automotive / Cars & Trucks Carburetor components

I am translating an old John Deere tractor manual and want to make sure I get all the component names right. I have seen "Volllastnadel" and "Teillastnadel" but not sure if either of those is correct here. I have also seen the term "Leerlaufdüse" but again want to be sure if this is the same part.

Any references would be most welcome.