Today's Message Index:
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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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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
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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
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Message 3
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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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