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  1. #1
    Moderator OsideBill's Avatar
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    Common Carb Issues

    I thought I would start a thread on issues I have seen in carbs. These are photo's I have collected of actual conditions.

    Plugged internal filters. Check your external fuel filters and replace at least once a season. Use only OEM replacements. The aftermarket ones do not work as well and some do not flow the proper amount of fuel, even the so called high flow ones.

    The pile of sand or whatever it was, is the worst I have seen yet. That all came from the filter I was holding in the photo.
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    Last edited by OsideBill; 06-26-2008 at 12:15 AM.


  2. #2
    Moderator OsideBill's Avatar
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    Corrosion

    Corrosion
    This is when you want to scream. You open up a set and see they have had water sitting in them. These were bound for the trash can, the adjustment screws were frozen.
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    Last edited by OsideBill; 06-26-2008 at 12:20 AM.

  3. #3
    Moderator OsideBill's Avatar
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    Creased fuel pump check valves

    Creased fuel pump check valves

    This will cause a loss of pressure, which could result a lean condition. This is more common in the SBN's on the older GP motors, but I have found a few lately on the GPR SBN-I's both instances have been the #2 carb.
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    Last edited by OsideBill; 06-26-2008 at 12:16 AM.

  4. #4
    Moderator OsideBill's Avatar
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    Improper Arm adjustment

    Improper Arm adjustment

    This one is too high, which will cause the diaphram to hold the needle open and continously dump fuel down the carbs. Makes tuning the low end impossible. Arms that are too low will cause the needle not to open or open too late.
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    Last edited by OsideBill; 06-26-2008 at 01:28 AM.

  5. #5
    There is no VooDoo like BadVooDoo NeVerMind's Avatar
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    Nice post! I needed this about 3 weeks ago... But the carb tool helped a lot (the pics would have done me good)

  6. #6
    Moderator RX951's Avatar
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    Corroded bolts & Brittle O-rings

    excellent information. Bill, can you show people what you use to install the checkvalves. I use a ball-end allen wrench, its really small...not sure on the size.

    * Its also common for the carb bolts that hold the pump block and diaphram end to corrode making it hard to remove. I've had to dremel a slot on the head when the phillips end strips out and use a wide blade screwdriver to remove.

    * o-rings will also get brittle and and the channels where the oring sits will get cruddy.

    Here is a How-To if you strip a bolt
    http://www.instructables.com/id/Remo...crew-or-bolt./
    Last edited by RX951; 07-15-2008 at 02:09 PM.

  7. #7
    Moderator OsideBill's Avatar
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    Quote Originally Posted by RX951 View Post
    excellent information. Bill, can you show people what you use to install the checkvalves. I use a ball-end allen wrench, its really small...not sure on the size. 2mm ball end allen driver and windex on the rubber piece.

    * Its also common for the carb bolts that hold the pump block and diaphram end to corrode making it hard to remove. I've had to dremel a slot on the head when the phillips end strips out and use a wide blade screwdriver to remove. I don't even mess around here. I hold the carb in a vise when I disassemble and use a proper fitting phillips and tap with a hammer while turning, rarely have one that I can't get out. When I do, I drill the head off then remove the block and use small vise grips on the screw.

    * o-rings will also get brittle and and the channels where the oring sits will get cruddy.

    That's another thread I am working on, I have several pics and will put it together when time permits.
    Last edited by OsideBill; 08-17-2008 at 07:52 AM.

  8. #8
    Moderator OsideBill's Avatar
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    Bad Gas?

    Bad Gas maybe? or foreign substance? I have never seen one like this before, crystalized gunk I found in a set of carbs.
    Edit: I now know this is the result of Ethanol in the gas, bad stuff for sure it combines with water then when the fuel evaporates this is what is left. Pre-mixed carbs do not get this bad as the lube helps prtect the metal surfaces. Also it is recommended you run a additive like Sta-Bil marine that is specificly formulated to treat ethanol based fuels.
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    Last edited by OsideBill; 03-13-2012 at 11:42 PM.

  9. #9
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    Quote Originally Posted by OsideBill View Post
    Bad Gas maybe? or foreign substance? I have never seen one like this before, crystalized gunk I found in a set of carbs.

    looks like suguar from a soft drink.....

    why do i say this? well i founs something that looks identical under the keys on my notebook keyboard after i spilt coke on it ans waited 6 months to clean it up under there....


    by the way bill, grade A post, i am going to go home and pull my old carbs apart now so i can get more familiar with them.


  10. #10

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    carburator maintenance

    More Please! Am getting ready to pull 99'XLT carbs out to find/fix sticking throttle and rebuild (kits already on the bench). Need more info like this. Keep it comming!

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