when you say carb to exhaust ports, you finding it in the bowls, or in the filter?? sucking anything in from exturnal source?? underside of hood, cowl area?? Im assuming that you had it apart did you get it all cleaned out good?? As per rusting on the cylinder walls. If you had it in an unheated garage stored. Condesation can form in the cylinders with weather changes if cylinder walls arnt coated. Had that happen to a block i had stored had them wiped down with oil and in a bag for a few years. Ended up with surface rust streaking, had to hone out.
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