SOHC.co.uk Forums > Project Board
1976 CB550F1 (what have I let myself in for) Project
Nurse Julie:
The valves do have indents in them and the indents should be there. So, one less thing to worry about 😊
Trigger:
It is hard to tell from just pictures. On the cam journals in the head, run your finger nail across and feel for any ridges.
The valve can be removed and the best way to clean the carbon off without damaging the valve is soak them in thinners for a hour or so and they will wipe clean.
The pistons look shot but, new oversize pistons and rings will sort that.
The pitting on the cam lobe's look very pitted and will pick up again when the engine is run.
eight0:
Thanks for the replies Trigger and Julie. Glad the valves are supposed to have the indents! I've been soaking up information on rebuilding a SOHC engine for years in preparation for this stage and never noticed the indents before.
There didn't seem to be ridges in the journals, they just look worn.
On the cam, When you say pick up again do you mean get worse? I guess I need a new cam if so. Can another F1 cam slot straight in?
I was hoping to avoid splitting the cases but if the top end is this worn I had better check the bearings in the bottom end too.
Bryanj:
All 500 and 550 cams are the same but check out the pads on the rocker arms as well.
Looks to me like oil left in too long.
eight0:
Thanks Bryanj I'll get searching for a new cam.
The pads on the rocker arms have no pitting on them so I think they're ok, unless there's something else I should check?
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