SOHC.co.uk Forums > CB500/550

Noise when turning ignition off

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DomP:
I've mentioned this before but not found out what causes it, every now and then when I turn the ignition on then off I get an airy pop type noise from around the seat/air filter area.  Any idea what's causing it?

taysidedragon:
It could be some kind of spit back through the carbs and air filter. Usually caused by timing or fuelling being a bit out. Another cause of the sound could be air leaks around the intake manifolds?

Athame57:
I've had that myself, also when I turn the fuel tap back on. Maybe the bike has farted? ;D

DomP:
That's kind of what it sounds like😄

McCabe-Thiele (Ted):
Could it be that turning the ignition on then off causes a spark that ignited any fuel vapour in the cylinder head?

 I would expect this to reduce to zero with repeated on/ off as the petrol vapour is burnt off.

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