> Just finishing up the process of putting the refreshed carbs back on the
> '3a. All is going ok, except, the rear most piston get stuck in the dome
> when pushed up. It gets stuck as well when the dome is off the carb body
> so it is not the needle alignment. That appears to be good. It looks
> like the dome may have been dropped and now a small ding in the near top
> side that has reflected inside the dome and this is where the piston is
> getting stuck ( evidence of minor scratches ).
> What can I do?
Get some "layout dye" (aka "machinists blue" aka "Dykem") and spray (or
paint) it onto the inside of the dome where you think it is rubbing.
Eg, https://goo.gl/qJCrT3
Push the piston up gently until it starts to bind, then remove it. If you
are right about where it is rubbing, you'll see a white spot where it rubbed
off the blue. Take a piece of fine abrasive cloth (or sandpaper) and sand
down the white spot a bit, then try again. The fit is supposed to be pretty
tight, so only remove a little at a time.
The blue dye will rinse off easily with almost any solvent although it's
somewhat harder to get off your hands. I often wind up with a blue left
thumb :)
-- Randall
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