Kolb-List Digest Archive

Thu 04/18/19


Total Messages Posted: 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


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    Time: 09:03:40 AM PST US
    From: "Jack Hart" <jbhart@onlyinternet.net>
    Subject: 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


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    Time: 09:03:40 AM PST US
    From: "Jack Hart" <jbhart@onlyinternet.net>
    Subject: 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


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    Time: 09:20:14 AM PST US
    From: whiskeyvictor36@aol.com
    Subject: Re: 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.




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