Well, what I know is this- I've worked on lots and lots of gunked up engines. Usually it's a combo of old gas, water, rust, varnish and deteriorating fuel lines blocking up the passages in the carb. These are small engines or older ones, not injected. I've tried the various snake oils and most work to one degree or another. ATF, Berrymans and Sea Foam work best of what I've tried so far, in that order. With ATF I'm told it's the solvents and detergents and that makes sense to me. There are some types of gunk NOTHING will touch short of precision drilling of the passages.
As far as sticking valves, ATF comes out on top again. Back when I could get ATF for 88 cents a quart on sale I used a LOT of it. These days I cut it with diesel and try and stretch it.
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Today's Featured Article - Show Coverage: Journey to Ankeny - by Cindy Ladage. We left Illinois on the first day of July and headed north and west for Ankeny, Iowa. Minus two kids, we traveled light with only the youngest in tow. As long as a pool was at the end of our destination she was easy to please unlike the other two who have a multitude of requirements to travel with mom and dad. Amana Colonies served as a respite where we ate a family style lunch that sustained us with more food than could reasonably fit into our ample physiques. The show at Ankeny
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