it ran for quite some time at the settings i left it on when the weather was still warm it was just a pretty rich on the top end no low end bog just a top end spit...so i tried to tune that out of it and i turned the HSN about 1/8 of a turn and it fell on its face...im guessing that maybe it had some trash in the carb and it came loose when i turned the HSN so when i get time im gonna take it apart clean it really good and put new fuel lines on it and see if that helps....as for tuning for cold weather i would turn the HSN to a richer setting since the cooler air is more dense drawing in more o2...but it was rich to begin with...before it was always fairly easy to tune. but im gonna clean the carb and change the fuel lines and stuff hopefully that will help.