SOHC.co.uk Forums > CB500/550

Which Carbs do I need?

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Acro1985:
Hi All

I am new to the SOHC scene having just bought a 1977 CB550 project to get my teeth into. the bike unfortunately didn't come with the right carbs, they appear to be from a CB400. from doing some research on the forum it would appear my frame is a CB550F2 from the vin on the headstock but the engine number (CB550E-2028203) is from a K3 I believe.

So I am after some help/advice as to which carbs I need to track down.

McCabe-Thiele (Ted):
If you look at the carbs you will see the type number on the top outer flange by the mounting bracket on number four carb. They will all be stamped there they should be 637B on a 500. The 550 Carbs are marked 069A

You can fit 550 carbs if you swap the jets onto a 500 - I doubt the 400 ones would fit easily they are type 054A.

Bryanj:
Engine makes no difference but inlet manifolds do, are there screws on the inlet manifolds for vac balancing

Acro1985:
The carbs I have are stamped with 054A, i have offered them up to the inlet manifolds on the engine and they fit/marry up to the inlet openings at all.

there aren't any screws on the inlet manifolds for balancing.

thank you for your responses.

McCabe-Thiele (Ted):
They are the same carb body number as my 400 carbs.

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