SOHC.co.uk Forums > CB350/400

cam cover and camshaft seats.

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Nurse Julie:
Looking at that bottom photo, if you run your nail across, can you feel scores and ridges?, it looks like you will be able to but difficult to see on a photo really.

ricardo:
it feels very smooth to me.  a very slight suggestion of roughness over a tiny bit at one end

Nurse Julie:
So, in reality the camshaft looks like it will live to see another day if you cant find another one. It makes sense to me that the middle seats of the rocker cover are in better condition than the end seats as the cam chain is pulling everything downwards in centre. I would want to find out why there is a lot more wear on the right end than the left end of the shaft. You already have a replacement rocker cover , which you say is in better condition than the one that was fitted, so that bit is sorted. I think you must really remove the camshaft and see what the seats are like on the cylinder head. This will determine how much further you need to investigate.  Looking at the cam lobes, i assume they are little drops of water and not quite large pits ?. Have you had the bike running and was you riding it recently ?. The reason i ask is that if everything was OK and you are only delving deeper because you removed the rocker cover to have is spruced up and found a damaged bolt hole, maybe you are looking for work that is not required......just a thought.

Just noticed in your photo, is that a crack in the lobe ?

Nurse Julie:
Also, i am almost at the limit of my technical knowledge relating to camshafts / rocker covers etc here, I only learnt all this basic stuff from stripping my own engine, so if it gets much more in depth hopefully someone else on the forum with a lot more knowledge than i have will help out with advice. :) :) :)

ricardo:
Hi All esp Nurse Julie.

It was just a general strip down. It's newly acquired and had very poor power at low revs so I thought I'd service fuel system . I took the cam cover off as there was an oil leak- very minor- from the seal. It turns out it was from the breather cover seal. the other stuff was noticed then.
I've replaced the new cam cover and things turn over fine. Petrol tank off for respray so I'll  fit the electronic ignition and check the sparks before feeding it petrol over the next few days.

Thanks

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