SOHC.co.uk Forums > CB350/400

Carbs got to come off again

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exvalvesetdabbler:
Probably fine rust particles from somewhere. Did you reuse old fuel line which could have had a coating inside that's come loose. The fuel stabiliser prevents oxidation of the fuel and is also supposed to prevent it going corrosive once it's absorbed moisture. Oxidation of ethanol eventually makes vinegar(acetic acid).

You can usually tell if the fuel has gone corrosive when the brass ware looks like dull copper where the zinc has been strippe away from the surface. Dezincification of brass is well documented.

Regards
Dave

Ken4004:

--- Quote from: exvalvesetdabbler on June 20, 2026, 11:22:37 PM ---Probably fine rust particles from somewhere. Did you reuse old fuel line which could have had a coating inside that's come loose. The fuel stabiliser prevents oxidation of the fuel and is also supposed to prevent it going corrosive once it's absorbed moisture. Oxidation of ethanol eventually makes vinegar(acetic acid).

You can usually tell if the fuel has gone corrosive when the brass ware looks like dull copper where the zinc has been strippe away from the surface. Dezincification of brass is well documented.

Regards
Dave

--- End quote ---

Hi Dave yes I did use some of the old fuel lines but have now bought all new fuel lines so as you say it must have come from the old fuel lines as I cleaned everything else.
Another lesson learned !

Ken4004:
The carbs are back on and the bike is running and idling well now, starts first kick so  let’s see how long this lasts fingers crossed.

Mikep328:
 "starts first kick so  let’s see how long this lasts fingers crossed."

So next is fixing the electric starter?    ::)

Ken4004:

--- Quote from: Mikep328 on June 21, 2026, 06:48:20 PM --- "starts first kick so  let’s see how long this lasts fingers crossed."

So next is fixing the electric starter?    ::)

--- End quote ---

Electric starter works fine I was just seeing how many kicks it would take to start

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