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With the air filter removed, does the slide open the carb when the linkage moves? If it doesn't, you need to find out where the mechanical problem lies between the moving linkage and the non-moving slide. If it opens fully but does not rev up you apparently have a very clogged LSN. If the...

...but does the engine rev up?

Old fuel had gummed up your needle valves. You have to remove them and clean them using some fresh fuel, then reset and re-tune.