---------------------------------------------------------- RotaxEngines-List Digest Archive --- Total Messages Posted Sun 04/04/10: 2 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 04:44 AM - Unusual Tach indications (John Herbert) 2. 04:42 PM - Re: Unusual Tach indications (Roger Lee) ________________________________ Message 1 _____________________________________ Time: 04:44:05 AM PST US From: John Herbert Subject: RotaxEngines-List: Unusual Tach indications I have just completed a re-build of a Kitfox IV with a 912 UL engine and standard Rotax tach for a 912. After the re-build (with a new fuselage), the tach reads normally only above 2200 rpm. Below this it suddenly jumps approx 1000 rpm higher. I have checked the reading with an external tach and the are correct for revs above 2200. Troubleshooting has been to check ground continuity to the engine and the general electrical connections on the engine. If I disconnect the ground wire on the tach, the Tacho reads smoothly throughout the rev range, but under-reads by about 300 rpm. I have not yet checked for dirt or corrosion under the tacho pick-up yet, thatis my next job, otherwise any suggestions? John Tel. 00 27 834634865 Fax. 00 27 865285196 P O Box 879 White River 1240 South Africa ________________________________ Message 2 _____________________________________ Time: 04:42:59 PM PST US Subject: RotaxEngines-List: Re: Unusual Tach indications From: "Roger Lee" Hi John, You might try a completely new ground. Just make it temporary to just check it out. Your other ground may be a ground, but may be a very poor ground. -------- Roger Lee Tucson, Az. Light Sport Repairman - Maintenance Rated Rotax Repair Center 520-574-1080 Read this topic online here: http://forums.matronics.com/viewtopic.php?p=292984#292984 ------------------------------------------------------------------------------------- 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.