If you find that your enrichener piston(s) is/are stuck, you need to be very delicate in your efforts to loosen them. Soaking them in carburetor cleaner or the ultrasonic route should help. If you try heat, don't use much! The carburetor body can easily melt!
If you try the 'brute-force' method of trying to force-out the enrichment piston, you're gonna break it! Then you will need to buy one of these kits.
About the carburetor balance screws, do it somewhere that if the spring jumps-out of the brackets, that you have a chance to find it. FYI, one of the members recently posted about having a tough time getting the synchronization accomplished. He eventually discovered from his looking at pictures, that a prior owner had bent the bracket, so there was no possible way he could get them properly adjusted. He had to study how-much to bend it back, to allow the springs/screws to function properly. Also, if you get to a point where the spring is coil-bound, something's wrong, you need to find out why that's happening, and correct it. These bikes may have been wrenched-upon by a well-meaning but inept owner who messed things up. In the carbs alone, I've found jets just lying loose inside the jet block, main jets loose in the float bowl, emulsion tubes also just loose, torn CV diaphragms, cracked slides, broken air mix screws, various stripped threads, throttle cables tight like a violin's strings, and other problems.
Sometimes life gets in the way of bike repairs, and you have to do one thing one day, and resume another day. In the case of a carb soak, however you do it, be sure to use some type of water displacement spray in the enrichment system. Don't leave water or whatever you soaked it in, in the casting. It could cause oxidation/corrosion, to where the brass piston freezes in the bore. Ensure that all four enrichment pistons move freely when the thumb lever for the 'choke' is moved up/down. If you have 'em split into two pairs, and the shallow 'V' rod connecting one carb pair to the other carb pair, for the function of the enrichment lever is off, it's easier to work on the individual mechanisms for each enrichment piston. Another member found that the forked followers had been bent by a former owner, trying to fix the enrichment piston travel. A careful 'cold-set' of the forked followers was needed to have things operate in a coordinated fashion, it was just one carb as I recall. See pic #5 in my post #6, above. That was not the exact issue there, but the out-of-adjustment forked followers acting on the enrichment piston is the same concept.
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