|
Sponsored Links (Register now to hide all advertisements) |
|
|
Thread Tools | Display Modes |
05-14-2017, 10:58 AM | #1 |
Senior Member
Join Date: Apr 2013
Location: santa rosa ca
Posts: 257
|
Zenith air screw adjustment
On a Zenith carb. when you open the air screw(counter clockwise)from a full seat, does that let in more air or fuel? Making it richer or leaner at idle? When I come to a stop it smells rich. It idles good with the GAV closed and the air screw is 1 turn open. Float is set correctly.I am thinking it needs to be a little leaner at an idle.
Thanks as always, Marc |
05-14-2017, 11:03 AM | #2 |
Senior Member
Join Date: Mar 2016
Location: Lynden, WA
Posts: 1,564
|
Re: Zenith air screw adjustment
Pretty sure the idle mixture screw is an air adjustment.
|
Sponsored Links (Register now to hide all advertisements) |
|
05-14-2017, 11:16 AM | #3 |
Senior Member
Join Date: Jul 2012
Location: California
Posts: 1,696
|
Re: Zenith air screw adjustment
Turning the idle screw counter clockwise lets in more air, thus leaner mixture.
|
05-14-2017, 11:29 AM | #4 |
Senior Member
Join Date: Jun 2014
Location: Land of Lincoln
Posts: 3,131
|
Re: Zenith air screw adjustment
I just read how to adjust after a rebuild on Renners site. With a warm engine, gav closed, spark retarded, idle air turned out 1.5 turns, idle speed down to almost will die. Adjust idle air screw in until idle changes, then out until idle changes, some where in between you will find the sweat spot. Adjust idle speed and have a nice drive :-)
|
05-14-2017, 12:44 PM | #5 |
Senior Member
Join Date: Mar 2016
Location: Lynden, WA
Posts: 1,564
|
Re: Zenith air screw adjustment
I know everyone says the GAV position shouldn't change the idle mixture, but if my GAV is open much more than a quarter of a turn beyond my normal driving position, it gets a rich mixture at idle. As far as driving goes, it works great so I haven't messed with it.
|
05-14-2017, 01:59 PM | #6 | |
Senior Member
Join Date: May 2010
Location: Between Seattle & Tacoma
Posts: 2,354
|
Re: Zenith air screw adjustment
Sponsored Links (Register now to hide all advertisements)
Quote:
|
|
05-14-2017, 07:35 PM | #7 | |
Senior Member
Join Date: May 2010
Location: Mpls, MN
Posts: 27,582
|
Re: Zenith air screw adjustment
Quote:
I never have flow tested any of my jets, but it did give me 22 MPG at 45 MPH on a long trip a several years ago. If it ain't broke, I don't fix it. Just keep things lubed and do preventative maintenance. |
|
|
|
Sponsored Links (Register now to hide all advertisements) |
|