Had a similar prob. Are you fIooding? I don't know how old your critter is but I replaced the diaphragms, a.k.a. fuel pump, in the carb. (About $10) Then screwed in the idle adjustments all the way-LIGHTLY-and backed them out 1 1/4 turns. Once running, adjusted to a smooth high and low idle and per instructions.
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Had a similar prob. Are you fIooding? I don't know how old your critter is but I replaced the diaphragms, a.k.a. fuel pump, in the carb. (About $10) Then screwed in the idle adjustments all the way-LIGHTLY-and backed them out 1 1/4 turns. Once running, adjusted to a smooth high and low idle and per instructions.