---------------------------------------------------------- Kolb-List Digest Archive --- Total Messages Posted Thu 04/18/19: 3 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 09:03 AM - Richard's rpm seaking engine (Jack Hart) 2. 09:03 AM - Richard's rpm seaking engine (Jack Hart) 3. 09:20 AM - Re: 277 keeps falling off the pipe (whiskeyvictor36@aol.com) ________________________________ Message 1 _____________________________________ Time: 09:03:40 AM PST US From: "Jack Hart" Subject: Kolb-List: Richard's rpm seaking engine Richard, Your problem may be caused by oscillation of the slide and spring in the body of the carburetor. Bosch makes several different springs. Try a heavier or stronger spring. I had the same trouble with my 447 and a stronger spring cured it. Jack B. Hart, FireFly 004 Winchester, Indiana ---------------------------------------- ________________________________ Message 2 _____________________________________ Time: 09:03:40 AM PST US From: "Jack Hart" Subject: Kolb-List: Richard's rpm seaking engine Richard, Your problem may be caused by oscillation of the slide and spring in the body of the carburetor. Bosch makes several different springs. Try a heavier or stronger spring. I had the same trouble with my 447 and a stronger spring cured it. Jack B. Hart, FireFly 004 Winchester, Indiana ---------------------------------------- ________________________________ Message 3 _____________________________________ Time: 09:20:14 AM PST US From: whiskeyvictor36@aol.com Subject: Re: Kolb-List: 277 keeps falling off the pipe I once removed the exhaust system from a Rotax 447, sent it out for refinis hing of the exterior.=C2- It was sand blasted and plated with a ceramic p roduct.=C2- When it was returned to me, I could hear what sounded like pi eces of sand inside the muffler if it was turned over or shaken.=C2- Trie d blowing and vacuuming it out to no avail.=C2- Assembled it onto the 447 and went flying.=C2- I had not changed anything other than the exhaust r efinishing.=C2- However, the 447 acted pretty much just like what you des cribed.=C2- It would not hold a steady RPM.=C2- I thought incorrectly t hat the sand pieces were maybe to blame.=C2- Although the plane had set f or several weeks, I assumed the tuning of the carb should still be OK.=C2 - BUT, because I didn't really know what else to do, I changed the needle position.=C2- I can't recall which way it was moved (up or down) but the next flight resulted in a proper running engine that would hold the RPM se lected.=C2- Maybe the temperature had changed requiring the needle to be re-positioned.=C2- All of this was years ago, I got older and can't recal l all the details. Bill VarnesFireStar 447 RotaxAudubon NJ In a message dated 4/9/2019 9:39:38 PM Eastern Standard Time, thegreybaron@ charter.net writes: So the question is this - anyone else have a similar experience with a 2-st roke engine that kept falling off/climbing back up the pipe, and if so, did you cure it by reducing the prop length/prop load? I would like some confi rmation/reassurance/feedback before I start shortening the prop. ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message kolb-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Kolb-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/kolb-list Browse Digests http://www.matronics.com/digest/kolb-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.