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Problem?? sound like it's just rich enough. Seriously, you are pushing raw fuel out the exhaust. Yoo may need a little less injector or a calibration of the FAST unit. (is it able to be calibrated?)
This isn't as big a problem as it seems as long as it isn't frightening small children or spooking the livestock. Some people know when the mixture is just right by the color of the flame. You want a bright orange or redish flame. 
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michael
A man that is young in years, may be old in hours, if he have lost no time. But that happeneth rarely. Generally, youth is like the first cogitations, not so wise as the second. For there is a youth in thoughts, as well as in ages... Sir Francis Bacon (1561-1626)
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