Mechanic who?
Perhaps there are a lot of people who know a lot about mechanics out there. When someone poses a question with out any further info....such as how far can a frog jump? Take apart and clean the whole carb and inspect it and the intake manifold minutely. If the diaphram has a hole in it that indicates to me the carb is old or has had additives or cleaners run through it that could eat the black rubbery parts. Most carbs with a throttle plate and a vacum diaphram will idle without the vacum slide even in the carb!! What you are describing sounds like a carb with partialy plugged passages that sometimes defies cleaning. Try another known good good carb and see if your problems dissapear. Two wheels motor in the middle then ride.
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