 Dellorto DRLA 40's, Won't idle. |
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| mmichalik |
 Jul 4 2025, 11:20 AM
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#1
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MikeM  Group: Members Posts: 768 Joined: 27-January 16 From: Valley Center, CA Member No.: 19,600 Region Association: Southern California 
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My '74 has a set of Dellorto's on it. The car won't idle, I can rev it up and it will run but, once I take my foot off the gas, it dies.
I want to clean out the carbs, because I understand that crap will get stuck in the jets and needles and such. Does anyone have any down and dirty advice: Do this, then this, type stuff, to clean them out? I just watched https://www.youtube.com/watch?v=8pDgxauguRY and will do that but, just wondering if there's anything else. I have a rebuild kit but I'm not sure I want to do that this weekend but, I can if that's the best way to go. Thanks! Mike |
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Replies(1 - 7)
| Superhawk996 |
Jul 4 2025, 01:30 PM
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#2
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914 Guru Group: Members Posts: 7,212 Joined: 25-August 18 From: Woods of N. Idaho Member No.: 22,428 Region Association: Galt's Gulch
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Clean the idle jets. Probably won’t need to bother with the rebuild kit
However - when idle jets begin to clog it’s usually a sign that there is debris in the bowl that needs to be cleaned out too or they just clog again in very short order. |
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| mmichalik |
Jul 4 2025, 01:45 PM
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#3
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MikeM Group: Members Posts: 768 Joined: 27-January 16 From: Valley Center, CA Member No.: 19,600 Region Association: Southern California
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QUOTE(Superhawk996 @ Jul 4 2025, 12:30 PM)  Clean the idle jets. Probably won’t need to bother with the rebuild kit However - when idle jets begin to clog it’s usually a sign that there is debris in the bowl that needs to be cleaned out too or they just clog again in very short order. Thanks, Peter. I'm going out to do that now. |
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| barefoot |
Jul 4 2025, 02:08 PM
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#4
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Senior Member Group: Members Posts: 1,410 Joined: 19-March 13 From: Charleston SC Member No.: 15,673 Region Association: South East States
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If cleaning out the idle jets doesn't take care of the problem get yourself a gallon of carb cleaner and soak the carb bodies for a while. Don't need to take apart the acceleration circuit parts, then rinse out then with hot water, then blow dry, should clean them good. worked for me, see my post on the same issue
Barefoot |
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| mmichalik |
Jul 4 2025, 02:48 PM
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#5
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MikeM Group: Members Posts: 768 Joined: 27-January 16 From: Valley Center, CA Member No.: 19,600 Region Association: Southern California
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QUOTE(barefoot @ Jul 4 2025, 01:08 PM) If cleaning out the idle jets doesn't take care of the problem get yourself a gallon of carb cleaner and soak the carb bodies for a while. Don't need to take apart the acceleration circuit parts, then rinse out then with hot water, then blow dry, should clean them good. worked for me, see my post on the same issue Barefoot I will do that, if needed. Thanks! Looks like one of the main jets had some water corrosion on it though..... Not sure where it's coming from, it rarely rains in San Diego and the rain tray is on and the air cleaners are always on the carbs. I'm hoping that it's not systemic. |
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| porschetub |
Jul 4 2025, 06:00 PM
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#6
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Advanced Member Group: Members Posts: 4,877 Joined: 25-July 15 From: New Zealand Member No.: 18,995 Region Association: None |
QUOTE(mmichalik @ Jul 5 2025, 08:48 AM) QUOTE(barefoot @ Jul 4 2025, 01:08 PM) If cleaning out the idle jets doesn't take care of the problem get yourself a gallon of carb cleaner and soak the carb bodies for a while. Don't need to take apart the acceleration circuit parts, then rinse out then with hot water, then blow dry, should clean them good. worked for me, see my post on the same issue Barefoot I will do that, if needed. Thanks! Looks like one of the main jets had some water corrosion on it though..... Not sure where it's coming from, it rarely rains in San Diego and the rain tray is on and the air cleaners are always on the carbs. I'm hoping that it's not systemic. Water in IMO is about the worst thing that can get into a carb cast alloy and brass suffer badly, ask me how I know ? ,had my RH carb apart to sort an unrelated issue and had the top cover off, covered it but that leaked and got water in one of the bowls !!!!!! my fault (IMG:style_emoticons/default/headbang.gif) (IMG:style_emoticons/default/headbang.gif) . My carbs aren't IDF but water will do the same damage regardless. I think the water has got further into your idle curcuit ,I reckon you need to give them a very good cleaning ,a bad main jet wouldn't be the cause of a no idle situation ,good luck.  . |
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| brant |
Jul 4 2025, 06:12 PM
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#7
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914 Wizard Group: Members Posts: 12,010 Joined: 30-December 02 From: Colorado Member No.: 47 Region Association: Rocky Mountains 
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It’s most likely caused by pump gas and sitting to long
Modern pump gas goes bed in about 28 days because of the ethanol in it that attracts water. If you’re going to store more than three weeks you have to add stabile. Or better run ethanol free gas. Or better run av gas 100LL. |
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| cgnj |
Jul 5 2025, 03:33 AM
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#8
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Senior Member Group: Members Posts: 678 Joined: 6-March 03 From: Medford, NJ Member No.: 403 Region Association: None
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