sounds lean to me.. open up the mainjet 1/8 turn at a time and gas on it and check. keep doing it till it smooths out. watch the exhaust.. hopefully it smooths out BEFORE it starts blowing black sooty exhaust. find the sweet spot betwixt the two if possible.. :)
you may find when it warms up.. you can lean it a bit. i find I have to enrichen mine a hair when it gets colder...
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