In 1977 the carbs on the KZ650 were changed from the pilot (blunt tipped) screw to the pointed tip Airscrew. For some time carbs were available with both types of pilot/airscrews.
If your carbs have both types here is a tip on tuning.
Turn the pilot screws (blunt tip) all the way in, then set the airscrews as normal carburetor adjust procedure. Default is 2 (+/-) 1/4 turns out
Frame numbers affected
1977 KZ650 B KZ650B-024641 THROUGH KZ650B-026991
1978 KZ650 B KZ650B-027901 THROUGH KZ650B-028701
1977 KZ650 C CUSTOM KZ650C KZ650C-007751 THROUGH KZ650C-10000


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