SOHC.co.uk Forums > CB500/550

Black Fouled Plugs

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philward:
I'd be inclined to check the previously mentioned air filter restriction (under seat inlet). For it to happen suddenly is unusual for an air filter to suddenly get clogged - but its pointing to that area as all 4 cylinders affected.
Only other common part to all 4 cylinder (although obviously timed differently) is CDI - I don't know anything about the workings of those but maybe another forum member could advise if the CDI could affect all 4 cyclinders at once

hairygit:

--- Quote from: philward on January 23, 2021, 01:51:47 PM ---I'd be inclined to check the previously mentioned air filter restriction (under seat inlet). For it to happen suddenly is unusual for an air filter to suddenly get clogged - but its pointing to that area as all 4 cylinders affected.
Only other common part to all 4 cylinder (although obviously timed differently) is CDI - I don't know anything about the workings of those but maybe another forum member could advise if the CDI could affect all 4 cyclinders at once

--- End quote ---
No SOHC four (except CB650) came with CDI, they had points and condensers. Highly unlikely to be an ignition related fault on all 4 cylinders. As previously suggested the sudden occurrence points to restricted air intake or sticking choke flaps.

Sent from my POT-LX1 using Tapatalk

taysidedragon:

--- Quote from: hairygit on January 23, 2021, 03:04:54 PM ---
--- Quote from: philward on January 23, 2021, 01:51:47 PM ---I'd be inclined to check the previously mentioned air filter restriction (under seat inlet). For it to happen suddenly is unusual for an air filter to suddenly get clogged - but its pointing to that area as all 4 cylinders affected.
Only other common part to all 4 cylinder (although obviously timed differently) is CDI - I don't know anything about the workings of those but maybe another forum member could advise if the CDI could affect all 4 cyclinders at once

--- End quote ---
No SOHC four (except CB650) came with CDI, they had points and condensers. Highly unlikely to be an ignition related fault on all 4 cylinders. As previously suggested the sudden occurrence points to restricted air intake or sticking choke flaps.

This one has had one fitted previously.

Sent from my POT-LX1 using Tapatalk

--- End quote ---

faiz_mur:
Hi this bike using CDI which was installed by previous owner
It came with cdi black box aswell

I did timing check staticly havent try dynamic timing yet..
The bike doesn have air filter
Its just empty at the filter box area
but ya i did keep tools bag there
Might be chance  the make air restricted
I will try again..riding removing the tools bag
Thanks everyone

faiz_mur:
Hi some update
I did adjust float height no 1 and 4 carbs because it overflow.
I did replace my rectifier

And ya did few mile ride and there was no more carbon
Im not sure yet whats actually caused
This
Thanks everyone

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