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  1. #1
    x2ryder's Avatar
    Join Date
    Mar 2007
    Moline, Illinois

    Compression question

    Is it true that you can't really get an accurate compression reading with cv carbs because of the vacuum slides?

  2. #2
    rsg1963's Avatar
    Join Date
    Jul 2008
    Dublin, Ca. USA
    That is a bit of an urban myth x2. CV carbs do not need to be removed to do a compression check but the throttle needs to be fully opened.
    A CV carb with the throttle open will flow enough air to fill the combustion chamber with enough air to get an accurate reading.
    It’s a good idea to shut off the fuel and drain the float bowls beforehand.

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