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 |
mikelsr |
Aug 30 2005, 08:27 PM
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#2
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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 |
Thanks for the info. A long time ago I rebuilt carbs a lot but that was over twenty years ago. I am giving them a real good soaking and cleaning and I hope to have them back together this weekend. I'm going to transfer the jets from the working pair to mine and then more likely have to order some new yets.
I have purchased the book and I have read it and learned some stuff. I also bought the complete rebuild kit and the CB update kit for the DRLA. My carbs have either 50 or 55 for idle. When I talked to CB they suggested I get 160 mains, 60 idle for it and I would have to go see what the airs were. My friend has some weber's on his and was having some problems with them and that is why he wanted his carbs back. I hope to have them to him this weekend. If I have to I will send these off and get them rebuilt. Again thanks for your help. Mike |
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