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Old 10-13-2002, 06:27 AM
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Post Autolite 2100 mixture adjustment

Had a 1.14 venturi autolite 2100 on my 292 Y-block but lost all my low end. Have a 1.02 on there now, and engine runs much better except for some idle mix touble.

The right mixture screw is very sensitive, and produces a dramatic lean fall off when screwed in at one point. Engine will nearly die with screw about 1 turn out, but it can be adjusted out to idle OK. Now the left screw is entirely different-it can be turned in all the way, and the engine will still run. When the left one is in all the way, it is past the lean fall off point but not by much. When adjusted at highest rpm, the left screw is out by about 3/4 turn and the right one is out about 1.5 turns out. Does this indicate a carb problem? Exhaust is pretty stinky...

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Old 10-13-2002, 07:25 AM
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[quote]Does this indicate a carb problem?<hr></blockquote>

It indicates a possible restriction in the idle circuit. A quick fix is to remove the screws (carefully and don't lose the tension springs) and inject gum cutter or carb cleaner through the ports. Reinsert adj.screws and adjust again.

Start at 1 1/2 turns out and slowly turn them out until maximum idle is reached. Turn in maybe 1/8 turn and it should be balanced.

It is most likely ready for a tune-up kit and overhaul. The 2100/4100 Autolites are very simple to work on. Just make sure you get a quality kit.

[ October 13, 2002: Message edited by: KULTULZ ]</p>
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Old 10-13-2002, 01:19 PM
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Something to check first wuold be to mae sure the needles on te screws are still in good shape. If in doubt , look closely, then if you can find them replace them anyway! It doesn't take muc to smash the points(of the needles). sometimes they get turned in so far that they get a ridge going giving the operater a false reading on where the "all the way" really is.
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