SOHC.co.uk Forums > CB500/550
Ongoing PD46 carburettor woes (possibly)
deltarider:
--- Quote from: Bryanj on July 05, 2020, 11:02:11 AM ---Carefull with the wire thingies the pilot jets have a sort of cast in spider for some reason, maybe to atomise better?
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Not being a native speaker, I don't know what you mean by a 'cast in spider'. Does this pic help?
Bryanj:
Nope, cant expand it enough, if you look through a pressed in pilot the hole does not look "clear" as there is sometning in the small hole and its supposed to be there
deltarider:
--- Quote from: Bryanj on July 06, 2020, 10:46:15 AM ---Nope, cant expand it enough, if you look through a pressed in pilot the hole does not look "clear" as there is sometning in the small hole and its supposed to be there
--- End quote ---
I think I know what you mean. I have the same experience, but in my case I'm sure it's caused by my own eyes, a trompe-l'oeil if you will pardon my French. To verify the slow jet is clear, you need a magnifying glass, then vary its distance to the jet a bit until you see a hole like in the pic below. I can only see it using a magnifying glass or... by taking a picture. When you see a perfect round hole, you can be sure the bore is clear.
JezzaPeach:
Using the stainless wires VERY carefully I found the smallest ones went through one or two of the (Cb500) pilot jets with ease, no sign of obstructions, but some had a chalky white oxide type build up, similar to that in the float bowls. The wires are slightly abrasive half way along and went through the unblocked ones ok, so I felt I could risk cleaning the blocked ones to a similar level. It now starts and runs well.
Probably very close to 40# but likely old ones that have had any deposit will be slightly coarse and tend to attract more deposits. In hind sight with all the work involved new pilots would be tempting and the excellent forum members supply some good ones I think.
deltarider:
--- Quote from: jeremypeachey on July 06, 2020, 09:40:24 PM ---... some had a chalky white oxide type build up...
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It's residue from water. Decades ago I found it in some of the little holes in the needle jet sides. I cleaned them... never noticed any difference. ???
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