Ok, lets clear this up, completely.

[MattWadzRC]

Ok, so guys, please please please dont redirect me to a sticky or a confusing walkthrough. i have an AR.21 force engine, and i am slowly, very slowly tuning it. ok, so the longer gold/brass needle : does what when i turn it which way, and is called what
And the needle on the end of the throttle linkage is called what and does what.
i need a basic explanation.
thanks, i really need this cleared up, and also i need a fast answer.:\

 

[Metalhead Matt]

The needle where by where the fuel line enters(facing upwards) is the high speed needle. The one on the side of the carb, on the barrel itself, is the low speed needle. Tighten them to lean, open them to richen. Always use very small movements and run your car for a few minutes in between to let the setting take.

 

[MattWadzRC]

Thanks that helps alot, but does the HSN adjust the "mixture" at higher speeds, and the lsn visa versa
?

 

[Metalhead Matt]

The hsn meters overall fuel flow and from 1/4 throttle up. The lsn from idle to 1/4. But keep in mind that the hsn affects the lsn too.