Carbs sucking air, carbs sucked air so I rebuilt them |
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Carbs sucking air, carbs sucked air so I rebuilt them |
mikelsr |
Aug 29 2005, 02:59 PM
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#1
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Senior Member Group: Members Posts: 657 Joined: 2-January 05 From: Mahomet, IL Member No.: 3,390 Region Association: Southwest Region |
I have a carb'ed teener that is having some problems. Every since I bought the car I have had problems with the carbs (40mm Dellortos). A friend of mine let me borrow his until I get my fixed (his run great on my car). Well it has been a while and I want to get them back to him. So I am looking for words of wisdom.
I am getting a lot of carb backfiring so I rebuilt the carbs and had exactly the same problem. I found a couple of places they were sucking air and replaced the O-rings with another set and that fixed those leaks but I am still backfiring. I assume that it is still sucking air (need to test it again) or an air passage is blocked. Tonight I will tear them down again and let them soak for a day or two and then blow them out really well. I thought I had cleaned them well enough but you ever know. I also think that the jets may need to be replaced with different sizes (I am going to start out with the same size jets my friend has since I know they work with this engine). I don't have the sizes with me here at work. What size jets do most people use? From what I know the cam is original so it was designed for FI. This winter I will replace the cam and most likely rebuilt the engine. TIA |
rhodyguy |
Aug 31 2005, 06:53 AM
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#2
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Chimp Sanctuary NW. Check it out. Group: Members Posts: 22,188 Joined: 2-March 03 From: Orion's Bell. The BELL! Member No.: 378 Region Association: Galt's Gulch |
turning in each of the idle/air mixture screws, one at a time while noting the number of turns, will indicate if you have a pluged idle jet or idle jet circuit issue. if turning a screw in produces little or no effect, it indicates you have a problem on that particular one. you should sense a noticable stumble of the engine or popping in the exhaust note. after the rebuild, it's best to go through the initial setup proceedure. i'm more familiar with webers, do dels have the same type of air bypass screws? if so, double check that they are at a common setting. 60 idles "sound" a little "fat", but i see no mention of your engine's particulars.
k |
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