1. What are function
Hi and welcome to FixYa. I am Kelly
The L screw is adjusted when your having problems accelerating from idle..i.e sluggisgh acceleration or stalls.
The H screw is adusted at MAX rpm only to get the fastest engine speed. You may have to make minor adjustments on the L screw after adjusting the H screw to smooth out acceleration from idle to MAX speed so that you do not have stalls or sluggish acceleration.
There is one major NO NO when making carb adjustments... NEVER screw the jets tightly closed. The jet tips will jam into the carb body and twist off. If you ever have to close the jets completely... ligtly close them.
Thanks for choosing FixYa,
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