sgtmaj27
My 5780 8kw ser# 6040062 has a broken exhaust flex pipe. Since it is the same size as some straight flex exhaust pipe I had left over from a previous project, I just replaced the broken original with that.  It runs and sounds fine.  Not sure if there is an engineering reason for the original "ribbed" flex pipe.  Anyone see a long term problem with this fix?  I know that the OEM is only $25, but I keep left over parts for a reason!
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Peddler
It should be fine.
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Birken Vogt
Straight flex pipe meaning the spiral wound interlocking kind?  That stuff is normally used only in applications where it only flexes once in a while.  When attached directly to a vibrating engine it tends to split at the seams.  The accordion style stuff is for that.  But if the OE part broke after only x number of hundred hours, not much point in using it again.
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78buckshot
The stainless steel factory flex is a little brittle and tends to work-harden, I've had to replace them only on the single cylinder models.
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MacL
The pipe is ribbed to allow for engine movement during starting and stopping.  Without a flexible coupling, over time, muffler bolts could become loose, clamps could loosen, welds could crack, the whole unit may move more than it already does (if not bolted down).
State your problem, not your diagnosis.
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sgtmaj27
MacL wrote:
The pipe is ribbed to allow for engine movement during starting and stopping.


i didn’t consider the start/stop torque.  Perhaps I should rethink this fix.
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MacL
It is only an 8Kw I guess with a single cylinder engine, and your fix probably is not absolutely rigid, but that is just something to keep an eye on.
State your problem, not your diagnosis.
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Birken Vogt
Keeping vibration and engine start/stop bouncing from tearing up exhaust pipes is a major engineering hassle.  If it was easy they would not break so often in various applications.
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sgtmaj27
Given the comments(thank you). I will order the OEM part.  Inexpensive enough to not have to worry about it in the future.
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