The 1550s don't have an accelerator pump. They're the old Marvel carb.
Does it idle OK? For some reason I always have to keep mine choked a little. The 1600 is the same way. Is yours better after it warms up some?
I had trouble with mine idling rough and it was sucking air where the intake manifold bolts to the exhaust. You might check for leaks there and for intake leaks where the manifold mounts up to the head.
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