SOHC.co.uk Forums > CB500/550
Noise when turning ignition off
DomP:
That does sound like what it could be, is it normal or suggest anything Ted?
McCabe-Thiele (Ted):
--- Quote from: DomP on June 22, 2024, 09:52:02 AM ---That does sound like what it could be, is it normal or suggest anything Ted?
--- End quote ---
I have only encounted this type of noise decades ago on a highy tuned A series engine that had a racing camshaft fitted with intake trumpets.
As has been mentioned is the timing correct likewise is it idling smoothly on balanced carbs?
Is the air intake system/filter suitably enclosed to surpress what might be a normal occurrence?
DomP:
There's definitely a few of those questions I've not addressed yet Ted, timing I believe was spot on when I refitted the Dyna s ignition. As for balancing and air filter cover, they are a work in progress
K2-K6:
--- Quote from: DomP on June 22, 2024, 10:37:15 AM ---There's definitely a few of those questions I've not addressed yet Ted, timing I believe was spot on when I refitted the Dyna s ignition. As for balancing and air filter cover, they are a work in progress
--- End quote ---
Thats potentially the origin of it. Some system routinely discharge on shutdown which can fire anything fuel vapour-eee thats laying around in air intakes.
Likely that one of the cylinders has stopped with intake valve open to facilitate a route to vapours from one of the plugs.
A friends Ducati 916 routinely does the same.
taysidedragon:
I've just realised that you get this without running the engine. 🙄 I was tired!
I would look at the starter solenoid. It's in the area you hear the sound and is powered on and off by the ignition.
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