I have mentioned this before but I really do believe the days soaking a carb in cleaner and stabbing a kit in it are long gone, for a couple of reasons. First, a lot of the carbs were are messing with are 50 plus years old and have been rebuilt by who knows how many rebuilders, backyard or otherwise, and who knows how many times. Second, the professional guys have so much more available to them to do the job correctly. Like Carbking above, they use different cleaning solutions, ultrasonic baths, they have access to the little led or aluminum plugs to get into all the passages, bushings and the tooling to install the bushings so no vacuum leaks through the shafts, chromate dips, special tools to reform the seats for the check balls, new hardware and other necessary bits and pieces, specialty tools, wet and dry flow benches, all kinds of things that we hobbyists simply don't have access. I just looked at a pair of NOS Rochester BC's that I have had stashed away for a good many years. When I pulled the tops off to inspect the insides, they were a mess from sitting. The same thing is likely the condition of used carbs. A number of years ago I was running out of time on an engine build I was doing. So I farmed out the carb to a professional. When I got it back, it not only looked new, it ran like it was new out of the box with very little adjustment needed. So I gave up rebuilding my own carbs at that point. Less trouble and a better running motor. This is just my opinion, but in this day and age, you might be better off having a real carb professional redo the carb.
