engine ran fine last time out. now it starts right up on first pull and then starts to surge, hunting up and down then it will exhaust some black smoke . i have tried all remedies plug exchanged, removed air filter,checked auto choke,ok,taken carb off 3 times and blew out every passage as well as using copper wire to make sure no obstruction. same symptoms any suggestions as the toro dealer said they have drilled out jet next larger size.
kohler xt675
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