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Remove air cleaners. Remove choke cables from both carbs. Working on one carb at a time, so there's no possibility of swapping parts, undo the three screws that hold the dome to the carb body. Reach through the throat of the carb and hold the piston so it lifts out with the dome -- lift dome straight up, being very careful not to dink the needle in the piston. Keep the piston in the dome for now.
On a workbench, unscrew the cap at the top of the dome and pull out the plunger that comes with it. Pour out any old oil or whatever is left in there. Now remove the piston and spring that's behind it.
Clean everything with carb cleaner, paper towel, toothbrushes, Q-tips, etc. Do NOT attempt to polish anything with steel wool or use any abrasives at all.
Clean up what you can get to on the carb body in a similar way, and reassemble except for the cap/plunger. Make sure the piston is free to go up and down easily and that the needle does not rub inside the jet.
Repeat for the other carb.
Pour a small amount of motor oil in the hole at the top of the dome, install the cap/plunger, and lift the piston all the way up. Some oil should come out the vent hole in the cap -- if not, add a bit more oil and repeat until it does (have a rag handy). That is the correct fill level for the oil. The piston should now give up a fair amount of resistance pushing up, and it should drop right back down all the way with an audible thud.
Repeat for the other carb.
Hook choke cables back up.
How to synchronize and tune SU carbs
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