SOHC.co.uk Forums > CB500/550
500 carbs what does what question.
deltarider:
--- Quote from: McCabe-Thiele (Ted) on June 10, 2024, 12:15:15 PM ---So I have been sold the wrong tubes for my 500 by DS as they were the same - looks as if Gerben use the same supplier.
--- End quote ---
The correct path for ordering is:
1. Establish what exact model bike you have, by comparing the frame- and enginenumbers of yours to those listed in the first few pages of the CB500/550 partslists. Pay attention to the carb identification number in the same page and verify yours has the original rack or not.
2. Find the correct Honda partnumber in the apropiate partslist. They're all here: https://www.honda4fun.com/materiale/documentazione-tecnica
In addition, you may want to consult the overview I've composed.
3. Suppliers of aftermarket parts should clearly indicate which of their parts match which models.
Bryanj:
Forget all of that Delta this is NOT an original bike but built from a garage full of bits as Ted knew when he bought it so non of the comparisons will work
deltarider:
Provided you can read either 498- or 544cc on the barrel and the number stamped in the carbs you will at least have some sort ;) of a starting point. Slow as well as main jets have their size indicated and even the jet needles have a stamped in number.
Six months ago I have contacted Gerben to ask him if he had seen any difference in the venturis.
As far as I know, the numbers on the bodies only refer to the internal parts such as jets, needles, air screw settings, etc.
As far as I know, the bodies are all identical. I have never been able to detect a difference there.
[...]
McCabe-Thiele (Ted):
My block is stamped 498 cc my Pilot Jets & Main Jets are stamped 40/100 I have solid Brass air screws not the drilled type.
Ive looked at the 500 K1 UK parts book in the link you have provided but can't see a part number for the seperate Emulsion Tube only on the USA model. No one seems to give details of the layout & number of holes in the tube.
I am quite disappointed that DS sells the needle & tube kit BGABC-323-004P as described below for a CB500 K1.
"A direct replacement needle jet, produced by the most highly respected carburettor component manufacturer in Japan, assuring you of the highest quality part which was is no longer available from Honda".
I'm only guessing it's Keyster as they appear to be a Japanese manufacturer.
deltarider:
The solid air screws are typical for the 069A carbs (see pics). Apart from the very, very early CB500s where the parts concerned had separate partnumbers*, the CB500 NEEDLE SET, JET comes as a set: needle, clip and tube. To be honest, I have no idea how critical the differences are, as far as brassware. Personally I have no experience with aftermarket brassware.
* according to that Japanese JDM Partslist. https://www.dropbox.com/scl/fi/v37q90p9ptk45u60ml5tr/CB500K0%20JDM%20Manual.pdf?rlkey=hukkwrheiwtw5ri7v2p77c5dc&e=1&dl=0
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