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I'm not sure I'm remembering this correctly, but I believe high HC means there is too much unburnt (raw) fuel in your exhaust, which would most likely be caused by weak ignition, and high CO means ignition is occurring, but the gas is not burning ideally. Your HC readings seem to be very low, which is good, and I believe indicates that your ignition system has good spark. I'm thinking that your primary jets/rods are too lean, or your ignition timing is not advanced enough.
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