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run 32:1 is the safest mixture to run. as long as you are runnin a high end 2stroke oil made for aircooled motors you are good to go
 
You may be sucking air somewhere giving a lean mix, does it knock on giving it the gas, or smoke more than usual with whitish smoke?
 
white smoke is mormal. make sure ya got the choke off. that will foul out plugs quick. and those plugs you are usin could be the culprit. you just don't want to be blowin huge clouds of white smoke all the time. but at first that is normal when ya start it and just gettin warmed up