---------------------------------------------------------- RotaxEngines-List Digest Archive --- Total Messages Posted Sun 11/25/07: 1 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 06:26 PM - Dry Black velvet Plugs (Roger Lee) ________________________________ Message 1 _____________________________________ Time: 06:26:42 PM PST US Subject: RotaxEngines-List: Dry Black velvet Plugs From: "Roger Lee" Hi All, FYI I was having an issue on cylinders 1&3 spark plugs running with a dry velvet black coating. That means the mixture was a little rich. Not from idling too long as some A&P's suggested. I rebuilt the carbs and the rich mixture problem went away. The carb on that side evidently had an issue. Now both sides are a nice light tan. I must have had 4 Rotax people tell me I was idling too long, one suggested to change the mixture screw which I did with out any good results. No one suggested rebuilding a carb or that a carb might have had a leak (it was not the float level, that was checked early on). If you are having a velvet black coating on one side of your engine then rebuild the carb. It's easy. Two gaskets and a few "O" rings, then sync the carbs. The morale to the story is to have good differential diagnosis skills. Think of all that might cause an issue and not just the easiest or most common. -------- Roger Lee Tucson, Az. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=148494#148494 ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message rotaxengines-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/RotaxEngines-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/rotaxengines-list Browse Digests http://www.matronics.com/digest/rotaxengines-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.