SOHC.co.uk Forums > CB500/550

Hanging Idle and poor throttle response.

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Sesman:
Incidentally, I’ll replace the pilots with new replacement just for peace of mind. Would you know where I might acquire 4No new ones?

I see Allan’s have some, but I’m a little unsure on the specification. Are the cb 500 4 the 28mm type?

JezzaPeach:
Interesting. I wonder if anyone has a close up photo or diagram of these structures? It never occurred to me when I cleaned mine. Some were blocked solid, so an ultrasonic cleaner would be needed?
Also wondering if this could cause a stall at tickover when hot.

Sesman:
I’ll attempt that when my replacements arrive, but to be fair the bike starts and  runs like a new one. I’d love to know how they manufacture them.

I suspect that by clearing the ‘web’ the engine will run slightly rich at tickover and this may contribute at high revs to a slightly richer mixture …but I’m absolutely no authority on the topic.

I’ll know soon as I’m anticipating that with new pilot jets, more choke may be required for cold starting….we shall see.

Sesman:
It’s possible that if the webs were creating a mist, fuel droplets and an over rich mixture would create a hot stall….just guessing. The air screws can only do so much in terms of vernier mixture adjustment? I’m guessing that it’s the combination of fuel delivery and air screw adjustment that’s important and by clearing the webs ( if they really exist) it’s possible to wander off scale too far.

But again I stress, if  I’ve mistakenly removed the webs thinking they were some kind of blockage….my eyes are not good….i’ve not suffered any noticeable detrimental effects…so far.

deltarider:

--- Quote from: JezzaPeach on August 22, 2022, 03:04:14 PM ---Interesting. I wonder if anyone has a close up photo or diagram of these structures? It never occurred to me when I cleaned mine. Some were blocked solid, so an ultrasonic cleaner would be needed?
Also wondering if this could cause a stall at tickover when hot.

--- End quote ---

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