Carb jetting question
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Elder User
Joined: Feb 2013
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From: Crystal Lake
Carb jetting question
My 54 is running bit lean. It was a California truck, and don't know if the altitude difference requires a change in carb jets. It's an OEM setup. Does anyone know what the best size jets that would work to correct this?
Any help is appreciated.
FP
Any help is appreciated.
FP
More Turbo
Joined: Apr 2007
Posts: 528
Likes: 4
From: Charelston, Illinois
I don't know what the stock jetting is for your truck, but you will need to find a jet one size larger to compensate for the ethanol enhanced fuel we get here in Illinois.
Just my 2 cents....
Just my 2 cents....
Logistics Pro
Joined: Nov 2006
Posts: 3,672
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From: Fallon,NV & Bainbridge OH
Just because you say a California truck it don't mean anything, I moved from the bay area, CA, at near sea level, to Truckee, CALIFORNIA at 6000' +/- . So jetting varies a lot in CA. If it was jetted for any elevation in CA you could be a little lean. Need more info.
Logistics Pro
Joined: Nov 2006
Posts: 3,672
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From: Fallon,NV & Bainbridge OH
That is pretty low elevation wise so if it was jetted right there it should be close for where you are at. But like Ross said if it sat at all it could have crap building up in passages. Take the carb apart blow some carb cleaner and air through it and try it again.
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Posting Guru
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Make sure the throttle shaft doesn't have a leak around it (it probably will - it's old and worn). At idle, spritz a little cleaner where shaft enters throttle plate. If it revs up, there's a leak.
Edit - of course, that could also indicate a leak at the throttle plate gasket(s), etc..
Edit - of course, that could also indicate a leak at the throttle plate gasket(s), etc..
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Logistics Pro
Joined: Oct 2002
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From: Valley Center, CA
The backfire makes me think a timing issue, not fuel mix.
Step 1. Pull a plug and look for color of the previously white electrode.
Step 2. Adjust ignition timing appropriately.
Step 3. Check plug color again. If your carb, timing and plug heat range are correct, it should be a light tan or grey. The tip closest to the electrode may be colored differently than the porcelan deeper inside the plug body. The tip color shows you idle and the deep down indicates what's happening running down the road. Black means too cold 9may be too rich?). White or yellow indicates too hot, (maybe too lean?)
Good luck, Jag
Step 1. Pull a plug and look for color of the previously white electrode.
Step 2. Adjust ignition timing appropriately.
Step 3. Check plug color again. If your carb, timing and plug heat range are correct, it should be a light tan or grey. The tip closest to the electrode may be colored differently than the porcelan deeper inside the plug body. The tip color shows you idle and the deep down indicates what's happening running down the road. Black means too cold 9may be too rich?). White or yellow indicates too hot, (maybe too lean?)
Good luck, Jag
Logistics Pro
Joined: Nov 2006
Posts: 3,672
Likes: 367
From: Fallon,NV & Bainbridge OH
A lean condition will also cause a mis-fire, which resembles a backfire. As stated a vacuum leak will cause a lean issue but sometimes it is as simple as a jet size issue. If it runs fine with the choke on a jet size increase may be in order.
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