1978 (k)z650 overflowing carb

The bikes been stood idle for months and as part of the 'get back on the
road' plan, amonst other things i've already had the bank of carbs off,
removed the float bowls and checked the floats for movement. They were all
okay but did find one of the needle valves stuck solid. Freed it up and the
correct 'float bounce action' was restored. Prior to this, turning the
petrol tap to prime position caused petrol to pour out of one of the
overflow pipes. Carbs are now refitted and this seems to have fixed that
particular problem. But now when the bikes running petrol is pours out of
one of the overflow tubes every 6 or so seconds.
Is this the same problem returned or something else and is there a posible
solution that can be performed without having to remove the carbs? That was
one ballbreaking miserable job. Just to mention that the bike appears to
start easily and runs smoothly despite this carb problem.

 

<snip>

Take the overflow pipes off.

Note which carb is flooding.

Check the floats are`nt punctured (stick `em in a bowl of water an watch for
bubbles).

Check the float valve rubber tip(or metal tip if an old type) is in good
condition.

Check the float valve seat for scoring.

Check float height with a *good* steel rule or vernier.

Replace knackered bits.

Ride bike.

--
Petel .
02 M2 Buell.
C90-ZZR.

http://homepage.ntlworld.com/peteh1/website/index.html