I have a 1980 242 with B21F and K-Jet. The idle speed adjustment screw is the black plastic thumb wheel type thingy under the intake manifold, attached to the front side of the throttle body. Does this black plastic adjustment screw unscrew completely in order to be removed ? I picked up a spare throttle body at the pick-n-pull and wanted to remove the black plastic screw to check for cracks, clean everything up etc. Has anyone here ever taken apart this idle speed mechanism on this version of the throttle body and then reassembled with new gaskets, o-rings or whatever ?
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