there are 4 vacume ports on the bike .
1 on each carb , on the front of the carb pointing up and
just behind the rubber carb to intake boot.
the other 2 ( 1 on each intake )
are just infront of the boot and again pointing up.
each has a rubber cap ( squirle condom ) sealing it.
if any of the caps are loose you will have a vacume leak.
if any of the ports have something other than a cap
some of the emmisions crud is still connected.
