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GA16DE
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606 Posts
At idle its the needle, located at the carb's base, rear side
At higher revs there are jets (lil brass precision perforated screws) that control the a/f ratio
You can change the jets size for a performance or fuel economy config
 

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Discussion Starter #3
the jets you mentioned are those in the carb which viewable from the top?

Do you mean i need to purchase other different size jets to control the a/f ratio or just by turning it?
 

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GA16DE
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606 Posts
Nope
In the standard carb you must take its top piece off, where the float and fill valve are located
The jets are at the top/bottom of the fuel bowl
You must change them
The idle needle just needs to be turned in til the engine hesitates/stumbles, then open it 1/2 or 3/4 turns and thats all
Of course this is a very short version of the whole procedure, I'm asuming you have basic mechanic skills and practice
 

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Discussion Starter #5
Beside changing the jets, any other way to change the a/f ratio?
is there any screw to be open or close to control it?
 
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