could use some help finding out vacuum lines. On the bottome of the carb boots on the cylinder head there is a vacuum nipple coming off each carb port. 2 of them have a rubber block off and the other 2 are open like a hose goes on there. i can take pictures if anyone needs me too. its a 1991 Honda cbr 600 f2 BUT i just put a 1995 honda cbr 600 f3 motor in with harness and all.

 

Those may be the taps for synching the carbs. If this is what they are, you need to cap them.

 

as duck said those are the taps for carb syncing. i know at least cylinders 2-4 should have the nipples and rubber pieces, not sure if #1 should cause on mine theres just a screw, but the ones without the nipples and rubber pieces, just get a short screw that will fit in there and use a small oring and a washer to make sure its sealed.

 

You can get vacuum caps at most auto parts stores also.

 

ok thanks guys.