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If you hare having difficulty having in running smoothly, try to fiddle around with the mixture while its running. I do not know anything about these motors, but I would guess that the hole is to constrict the fuel flow while it is trolling slower and let the fuel flow better at high speeds so that the mixture does not get too rich at slow speeds or too high at high speeds, but that is just my guess. Given that it has a reversable prop, I would try it in the high speed position, because you can regulate the speed with the prop anyway. You could also have ignition problems if fiddling around with the mixture does not work.
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