71XS1B Carbs Screws01 The inevitable broken throttle plate screw. This must be removed, without damaging the throttle shaft or butterfly valve.
71XS1B Carbs Screws04 Apply firm downward pressure while carefully unscrewing the broken screw.
71XS1B Carbs Screws03 A high-quality/hardened, T6 torx screwdriver bit, with its slightly tapered profile and sharp splines, is an excellent easy-out
71XS1B Carbs Screws02 Drill a 1/16" (0.062", 1.5mm) hole, centered in the broken screw.
71XS1B Carbs Screws01 The inevitable broken throttle plate screw. This must be removed, without damaging the throttle shaft or butterfly valve.
71XS1B Carbs NeedleJet04 After being unseated from its recess, the nozzle can be removed.
71XS1B Carbs NeedleJet03 The nozzle protrudes above the venturi floor only about 2.5mm (0.100"). Stop tapping the punch when it meets the venturi fl
71XS1B Carbs NeedleJet02 Insert the punch through the nozzle from the top. While holding carburetor upright, gently tap the punch downward.
TwoManyXS1Bs

71XS1B Carbs Screws01 The inevitable broken throttle plate screw. This must be removed, without damaging the throttle shaft or butterfly valve.

weekendrider
I have gotten 4 out by using a 1/64 drill bit. The bit has "grabbed" the screw and spins it out the bottom.
Now I have one that is STUCK. I've drilled almost all the way through and it still is hanging in there.
 

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1971 XS1B BS38 carburetor rebuild
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