 Jets are too small, how do I replace?, noob question |
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| ronan |
 Dec 31 2022, 02:17 PM
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#1
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Newbie  Group: Members Posts: 13 Joined: 23-December 22 From: Phoenix Member No.: 27,051 Region Association: Central California  |
I just bought a 1975 1.8L, with dual weber 40mm carbs. The car was in an elevation of 7000 feet, but I live at 1300 feet, so it runs lean and dies when it tries to idle. Does anyone know about how difficult it is to replace the jets for my elevation? What is the proper size of jet? Any videos of how to do this?
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| 930cabman |
Dec 31 2022, 05:44 PM
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#2
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Advanced Member Group: Members Posts: 3,062 Joined: 12-November 20 From: Buffalo Member No.: 24,877 Region Association: North East States 
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Was the engine running good at the higher elevation? I would not assume the jets are incorrect. Could be plugs, spark timing, clogged jets, ..... Have you checked the AFR with an accurate gauge? |
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| 914043 |
Dec 31 2022, 07:17 PM
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#3
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Member Group: Members Posts: 87 Joined: 2-April 19 From: California Member No.: 23,007 Region Association: Central California
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QUOTE(ronan @ Dec 31 2022, 12:17 PM)  I just bought a 1975 1.8L, with dual weber 40mm carbs. The car was in an elevation of 7000 feet, but I live at 1300 feet, so it runs lean and dies when it tries to idle. Does anyone know about how difficult it is to replace the jets for my elevation? What is the proper size of jet? Any videos of how to do this? Go to Piercemanifold.com Much info about Weber carbs. you wont be sorry |
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| stownsen914 |
Jan 1 2023, 10:37 AM
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#4
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Senior Member Group: Members Posts: 913 Joined: 3-October 06 From: Ossining, NY Member No.: 6,985 Region Association: None |
Below is a pic of Webers. The jet stacks are the tall brass things between the air intake stacks. They unscrew, and the jets are assembled in a stack. Here's a thread from right here on the forum showing/describing how to disassemble the jet stacks.
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| slivel |
Jan 1 2023, 12:08 PM
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#5
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Old car....... older driver Group: Members Posts: 508 Joined: 10-July 04 From: San Diego Member No.: 2,332 Region Association: Southern California |
Elevation makes a big difference in performance especially with carbs. From sea level tracks to Miller Motorsports near Salt Lake the change in elevation required one or two sizes smaller main jets for my car depending on air temperature/density.
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