I know 2002 Lancers with carbies is uncommon. I'm also aware this is an old question. But if it helps someone else...
Assuming you have a carburetor 4G15:
The choke is a wax pellet type and works automatically. As the engine temp rises the wax melts and lets more air in.
The air/fuel mix adjuster is in a tricky position facing the firewall.
I'll re-post a pic I found online that's helped me (not my pic).
To turn the air/fuel screw, you need to mod an old sparkplug. A search should show how it's done.
Easy...the choke can be adjust at the front of the carburetor..it is brass tiny flat screw..dont force the screw!!! its easily broke...you need to push back the spring that pushes the choke in order to screw in the choke...about the air fuel mixture screw...there are 2 screw to adjust...you will need a short flat screwdriver..at the back of the carb...the is also brass screw...that is mainjet adjuster...and at the top its not a screw..that is really hard to adjust!! you neet a special tool to spin it...remember..that hard to adjust screw is crucial!!! if you get it wrong...its hard to go back...so if you wanna do so...you must be mentally ready....
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how to set fuel air mixture
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