Are you sure that you don't have a manifold leak? Try starting it and squirting carb spray around the manifold base and carb connection. As for jetting, check jets by holding them up to the light to see if there plugged, you must see a clean round hole, not just light but a clean round hole, Jetting sizes are in metric, idle may be .35 mm, one mm is very close to .040 in" so .35 X .04"= .014 in or 14 thousands of an inch. a main jet may be 1.25 mm that = 50 thousands of an inch. If you have a micrometer and a set of wire drills you can check and change your jetting.
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