I forgot one more thing, check the cutoff lever. If the lever is not raising high enough to engage the cutoff trigger switch, you won't get semi fire but only full auto. Either replace the cutoff lever or bend it so it raises higher when the sector gear engage it.
@ coachster, yea I've see this issue a lot with cheaper gearboxes. It can make you go nuts when it's just off by millimeters.
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