Hi, could you clarify a few points?
In first post your say it "runs for 30 sec to a minute" and the last post ,"fires and does not run",which is now the case and has anything changed since you stripped the carb?
Is the carb screwed directly to the tank or fed by a tube from the tank?
If the latter,is the float chamber held on by a single bolt,did you remove and clean the jets/emulsion tube in the carb?
Can you post a picture of the carb?