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  1. #1
    kansas 79 custom's Avatar
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    Recently when slowing down I'm getting intermittent popping and cracking out of the exhaust. At times very loud. Also, idle speed is diminished and I had to re-adjust it. The popping doesn't always happen, and other than that, starting, acceleration, and performance is fine. In-line fuel filter is clean.
    "Guns don't kill people, apes with guns kill people", Charlton Heston

  2. #2
    Senior Member Bryan's Avatar
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    Sounds like a classic case of perforated air cut off valves. From my experience no harm will come to the bike if they're not changed immediately.
    1980 CX D

    51 years old (me, not the bike)

  3. #3
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    Check the color of your plugs. popping is idicative of lean. Plugs would be white.



    Could be ACV's, they can be easily and freely bypassed.
    GL650 Interstate: 68,000 km

    Age 39

  4. #4
    Senior Member Blue Fox's Avatar
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    It sounds like one or both of your ACV valves have gone south. They are the little diaphram thingies on the side of the carb. The left one is easy to access, the right one, not so easy without carb removal. Take the easy one off first and check for perforations. You can either replace the diaphrams, or block off the O ring under the cover. If you block the O ring off, open up your idle mixture screw a little. These valves were EPA mandated to allow for lean mixtures. There shouldn't be any harm in blocking these off.
    1983 GL650I, 1980 CX500, 1974 CB350F, 1973 CT90

    Need information? Try our new Wiki site: http://cx500forum.com/mediawiki/index.php?title=Main_Page

  5. #5
    kansas 79 custom's Avatar
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    Quote Originally Posted by Abes_CW View Post
    Check the color of your plugs. popping is idicative of lean. Plugs would be white.



    Could be ACV's, they can be easily and freely bypassed.




    Will do. Hasn't been that long since I kitted the carbs. No mixture screws on these carbs BTW.
    "Guns don't kill people, apes with guns kill people", Charlton Heston

  6. #6
    Senior Member Shep's Avatar
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    Also check for leaks in the exhaust.These can cause backfiring/problems.
    If you change your carburettors or oil filter housing or make any modification to your Motorcycle without informing your insurancecompany you ain't got jack shit on medical if you have and accident

  7. #7

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    I have the exact same symptoms on my 1980 cx500D. Granted it has straight pipes, is not rejetted, although I have harley 883 sportster mufflers that I'm looking to get put on as soon as possible.



    What's an ACV... Air Cut off Valve?



    My fuel vent hole is fine, inline filter is fine, and there are no kinks in the hose. I know this only because I drained my gas and put in brand new stuff.
    --

    1980 CX500D

    Toronto, ON Canada

  8. #8
    Senior Member
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    Quote Originally Posted by kansas 79 custom View Post
    Will do. Hasn't been that long since I kitted the carbs. No mixture screws on these carbs BTW.




    No mixture screws?
    GL650 Interstate: 68,000 km

    Age 39

  9. #9
    Senior Member kingston73's Avatar
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    Quote Originally Posted by Abes_CW View Post
    No mixture screws?


    That's what I was about to say also. ┬*Did you put on a set of mystery carbs? ┬*Far as I know all the CX's had the same basic type of CV carbs, with or without the vacuum line but all had mix screws.
    79 Deluxe┬*┬*



    80 Custom engine┬*




  10. #10
    kansas 79 custom's Avatar
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    Original factory carbs without any external adjustments except for idle screw.
    "Guns don't kill people, apes with guns kill people", Charlton Heston

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