Popping on Deceleration

6 replies to this topic
  • dazzabb

Posted July 01, 2007 - 01:43 AM


After playing around with the fuel screw and the idle knob for the best idling I now have a constant popping on deceleration.

Read a couple of threads about it and general consensus seems to be its harmless, but what causes it and is it really harmless?


  • Asgeir

Posted July 01, 2007 - 01:04 PM


Mine (2004) does that only if the exhaust flange is loose, so it it draws fresh air into the exhaust on decelaration.

  • ruralrider

Posted July 01, 2007 - 03:40 PM


it is either that exhaust gasket between the header and silencer is out of place or it is running a little lean

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  • dl19

Posted July 02, 2007 - 10:13 PM


Mine always does just before it runs out of fuel. So, I would go with the lean fuel issue. JMO

  • ChR1s

Posted July 03, 2007 - 07:54 AM


Lean. The exhaust gasses accumulate in the exhaust and THEN fire (pop) after enough volatile gasses have gathered in the pipe, whereas normally the spent gasses are rich enough to combust continuously.

  • Mutu

Posted July 04, 2007 - 02:49 AM


What pilot you running? Try a 48.

  • xrmarty

Posted July 04, 2007 - 11:44 AM


How bad is the pop? If it's just a little popping, that's normal and expected. If it's sounds like a cannon going off, contrarily to popular belief, it may be running too rich. This causes unburned fuel to explode in the header.


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