SOHC.co.uk Forums > CB500/550

Confusion over 550 engine and frame numbers

<< < (2/2)

bbrian66:
I now have a dilemma. I am rebuilding the F2 back to completely original specification, or as close as I can get it. If the engine is a K3 engine then that's not going to work. I see that any number of empty crankcases are available on the web - will the K3 internals fit into an F2 crankcase? Or do I need to source a complete F2 engine?

Thanks.

Bryanj:
All 550 engines are the same except the lasy ones have pinned rocker shafts but you cant tell that from the outside, to rebuild in new cases you will probably need new ,expensive and difficult to get, main bearing shells.
Personally i see no problem with a different engine number, you are rebuilding with a mix of parts anyway and not even Honda can tell you what engine number was in what frame

bbrian66:

--- Quote from: Bryanj on March 16, 2026, 05:18:55 PM ---All 550 engines are the same except the lasy ones have pinned rocker shafts but you cant tell that from the outside, to rebuild in new cases you will probably need new ,expensive and difficult to get, main bearing shells.
Personally i see no problem with a different engine number, you are rebuilding with a mix of parts anyway and not even Honda can tell you what engine number was in what frame

--- End quote ---
Thank you for this response - its a very good point you make. It would certainly simplify things.

Navigation

[0] Message Index

[*] Previous page