Yes the bottom main jet adjustment you will only hear a difference at hi-idle under a slight load, this is when fuel is passing thru this jet. At idle it passes thru the idle jet. There are more than one circuit in a carb.
Some have an accelerator circuit also (mainly on the older model automobiles) w/o fuel injection.
Get your idle circuit set then set your idle rpms then go to the highspeed circuit. Make sure your choke is open while making these adjustments. IF your timing is somewhat late or not advancing it can cause spitting and sputtering upon take off or acceleration and most people think it is a carb problem when it really isn't.
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Today's Featured Article - Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
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