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It seems the warmer the weather gets, the richer my plugs look. Has anyone tried venting the vent tubes into the air filters as described above in this post or had success in another way? The only change I made to the default carb set up was to lean the idle mix. It's getting into the 90's here in SC. Also, does anyone know at what rpm the idle mix no longer has an effect on the overall mixture?
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Some of the info on this thread is from a gentleman who is flying a 912 as a pusher on a ultralight. Which means that the engine is uncowled and installed in a totally different set up than the RV12. So disregard most of his advise. Don't connect you vent tube to your air filter. There are some Scenarios where fuel can come out of that tube, for instance if one of your floats in the carb bowl stops floating then as the bowl overflows it will come out that tube. So if you have it connected to your filter then you will get an even richer mixture in your carb, not good. What do you mean, "richer my plugs look"? What type of fuel are you using, 91UL or 100LL? How many hours a month are you flying? Once you start up do you keep your idle RPM at 1800RPM or Higher? Do you replace your spark plugs with new ones every annual? When was the last time you balanced your carbs? All that being said if you have a smooth idle at 1800 rpm or better and a smooth transition to full power then dont worry about the plugs. Just throw them away at annual and replace with new ones. They are only about $3.00 each. We fly in 100F here in Texas us 91UL 98% of the time with no problems. If you are running 100% 100ll then Im sure your plugs are going to look Dirty. Then put some decalin in your fuel. Good luck.
