Which carb manifolds for a 78 cb550 engine that I want to run 75 carbs?

Quick question- I've got a 78' cb550 I'd like to run carbs that came from a 75'. The manifold I have, I can't remember if they came with the engine or with the carbs. But either way they don't fit. What year carb manifold will make this work?


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Here's a list of carbs for the various years of CB550 (found it on the sohc4 forum back when I started working on my bike)

If the carbs are from a '75, the corresponding manifolds should have vacuum port screws for syncing. The mainfolds for the PD model carbs don't (for these carbs, the vacuum port is on the carb).

Just what I needed to know. Didn't even notice that, thanks so much! Turns out these carbs are 627b's. Bought them off eBay and the seller sold them as 550 carbs. Anyone done this swap? Cb500 carbs on a 550. Going to do more research now, thanks for the tip Itenk.


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