Quote:
Originally Posted by BlueSideUp
Thank you for the help Sherwood. My idle mixture screws are actually one turn in, the spring seats on the carb body and then they are about one/half to one full turn in from that. I assume that is nearly full rich.
I am planning on making sure the idle and main jets are clean when I get back home this week. The intake gaskets need to be checked as well so I'll be picking up either ether or carb cleaner for that.
Hopefully I can get a video up soon so you guys can see how she runs.
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The idle mixture is leanest when the mixture screw is screwed in to the stop (internally). The spring merely provides tension to maintain the desired adjustment setting and thus has no effect on the mixture.
Sounds like you have a fairly rich idle mixture if you're using the spring as a reference.
The correct reference point is to start with all the mixture screws lightly seated, then back them off approx. 1 - 1 1/2 turns. I would also recommend a Synchrometer and a CO meter to monitor the settings while adjusting.
Idle mixture settings are fairly sensitive to small changes, and since the idle circuit is still active into the cruising range, a rich idle setting will affect overall fuel mileage more than one would expect.
Sherwood