Feedback carb mixture adjustment?
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Elder User
Joined: May 2012
Posts: 978
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From: Covington VA
Feedback carb mixture adjustment?
86 300 1bbl feedback carb
When i tinkered with the carb previously i ran the mixture screw all the way in the backed off 1-1/4 turns. Got it idling very well. But im lacking any hill power in 4th (np435 granny 4) at 35/40mph. I almost think its rich but how is that possible? Every carb i have touched before was full in then back out 1-1/4 or so for base mixture.
Anyway, how did you set yours? No vac gauge available. Air pump removed by po. Doing ignition/carb swap in about 3 months. Just want to get this working well til then.
Btw what is THE go to replacement 1bbl?
When i tinkered with the carb previously i ran the mixture screw all the way in the backed off 1-1/4 turns. Got it idling very well. But im lacking any hill power in 4th (np435 granny 4) at 35/40mph. I almost think its rich but how is that possible? Every carb i have touched before was full in then back out 1-1/4 or so for base mixture.
Anyway, how did you set yours? No vac gauge available. Air pump removed by po. Doing ignition/carb swap in about 3 months. Just want to get this working well til then.
Btw what is THE go to replacement 1bbl?
Moderator
Joined: Jan 2001
Posts: 57,005
Likes: 2,750
From: Virginia
Did you ever say where you picked up the ported vacuum for the DSII distributor? If you did I have forgotten. I thought this was a problem with the feedback carb?
Cargo Master
Joined: Mar 2008
Posts: 2,573
Likes: 207
From: Washington
It seemed to react correctly with the timing light and in a best case scenario I can consistently get 17 mpg so I am happy with it. But to be fair my normal is 14-15 mpg.
I think this feed back carb is off an 84 or 85 as it doesn't have a TPS on it.
Jim
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Thread Starter
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Elder User
Joined: May 2012
Posts: 978
Likes: 1
From: Covington VA
Jim, that red hose, whats it connect to? That port on my carb is open. Came that way for me. It doesnt seem to draw vac. Ive just left it open.
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FTE Legend
Joined: Jul 2010
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From: Northeast, OK
I think the red hose is a high-temp material and is used from the hot-air choke to a port in the air horn where it pulls filtered air.
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