Here's my stripped screws. I used a hacksaw to make a groove in the screw and used a common-head screwdriver to take it out:

Then I put in hex-head screws (M4x0.7, 10mm long):
Here's how I clean the Keihin carbs on my CBR:
http://cbrforum.com/forum/how-tos-81...needle-103846/