SOHC.co.uk Forums > CB500/550
500 carbs what does what question.
McCabe-Thiele (Ted):
Aside from fuel connections the only other links between carbs 1&2 then 3&4 that I can think of are vent pipes ??
They are unlikely to be able to draw air into the system as they vent to atmosphere anyway to allow fresh fuel into the carb bowls iirc.
Update:- Aside from the obvious flexible connectors over tightening the manifold to cylinder head nuts can mean the O rings will not seal due to bending of the alloy faces or the wrong sized O rings.
DomP:
You're right Ted, I initially looked at a YouTube video and they were looped together, remembering that is how mine were when I got my 550 I did the same this evening. But now I see what you are saying about them being vents for the bowls so I'll return them to how I first had them. In trying to solve some issues I'm seeing problems that aren't there😆
McCabe-Thiele (Ted):
The Emulsion tubes that I removed from my carbs had 5 holes on one side & one on the opposite side.
The two top holes are slightly smaller than the others.
I suspect the Emulsion tubes are replacements fitted by Gerben as they virtually fell out when I removed the main jets.
How many holes were there on the geuine Keihin part for a 500 has anyone here counted them?
deltarider:
--- Quote from: McCabe-Thiele (Ted) on June 09, 2024, 11:21:04 PM ---The Emulsion tubes that I removed from my carbs had 5 holes on one side & one on the opposite side.
The two top holes are slightly smaller than the others.
I suspect the Emulsion tubes are replacements fitted by Gerben as they virtually fell out when I removed the main jets.
--- End quote ---
Gerben just did the right thing to the 069A carbs in front of him. Falling out is not a sign they were not right. Mine also fall out, which makes servicing much easier btw.
--- Quote from: McCabe-Thiele (Ted) on June 09, 2024, 11:21:04 PM ---How many holes were there on the geuine Keihin part for a 500 has anyone here counted them?
--- End quote ---
Five on each side and they are all the same size. Very early CB500s may have had different tubes (the source is weak), but I've never encountered them.
McCabe-Thiele (Ted):
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.
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