Rebuild carbs with Mikuni MK-BN44 kit and replace the throttle valves to prevent vacuum leaks. The additional air gap lowers the vacuum signal needed to pull fuel through the low speed circuit. The wear occurs on the sides around the throttle shaft.
Ref: http://www.pwctoday.com/showthread.php?t=76392
Any other solutions out there? Contact vjpca@yahoo.com
Vince
April 2007