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dialing in Zenith idle mixture screw
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Chad_in_PDX View Drop Down
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Joined: 01 Sep 2022
Location: Portland
Points: 17 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Chad_in_PDX Quote  Post ReplyReply Direct Link To This Post Topic: dialing in Zenith idle mixture screw
    Posted: 18 Sep 2022 at 10:21pm
I’ve got a B that I’m still getting familiar with.

What is the process for dialing in (leaning out) the idle mixture? Right now my mixture screw is backed out 1.5 turns. This is on a Zenith 10698A. Going by smell, the engine is running rich. Also, the plugs are starting to get sooty.

Thanks

Chad
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Steve in NJ View Drop Down
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Joined: 12 Sep 2009
Location: Andover, NJ
Points: 11990 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Steve in NJ Quote  Post ReplyReply Direct Link To This Post Posted: 20 Sep 2022 at 7:39am
Usually, one and a half is a good starting point for the air/fuel adjustment. Every engine is different for adjusting to get that "right" spot, but if you're blowin' black smoke with the mix screw only 1 1/2 turns out, you might have a high float problem, or junk stuck in the needle seat causing the engine to run rich. The Carburetor might need some attention internally. It might have a lot of rust n' junk in it causing your rich issue..... HTH
Steve@B&B
39'RC, 43'WC, 48'B, 49'G, 50'WF, 65 Big 10, 67'B-110, 75'716H, 2-620's, & a Motorhead wife
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