Honda-SOHC

Without seeing the engine end of the cartridge filter it's difficult to be specific.

They work in the same way,  at least the filters I've seen, both original and cartridges flood the casing with oil,  force it through the filter material,  then exit via central port (screw thread or bolt)  into oil gallery of engines.

I thought the conversion just had a hollow male-to-male threaded stub to screw in place of Honda bolt that allowed the cartridges to be mounted to engine.  Sealing flange should be in same place.

Be interesting to see the photos when they arrive with you.

Yeh, I made a bit of a dog's dinner of that Steve.

Used the quote button on Julie's post and then deleted the text above the bit I wanted,  checked it with preview and it showed like it's now displayed,  but thought it would post correctly a bit like it doesn't show photos in preview.

Where have I gone wrong 

For the Velocette, it's great to have the bike you want and be able to ride out on it just when you feel like it.  I like seeing all the different bikes out at meets etc and be able to talk to the owners to find out more about them. A very nice bike.

On the book, I thought ultimately it was asking the question of should people be trained to pass the exams set for the subject ( purely theoretical)  or trained to do the job in a practical way that would enable the trainee to complete the tasks in real life situation.

The purely academic versus the vocational, or some mix of the two,  using the motorcycle, and running it correctly, as metaphor.

I thought the same before Julie said it,  they look pretty good just there.  If raised too much they get a bit too "Dunstall" I think.

I think the bike is an unusual blend of design,  it looks very classic with fork shrouds, overall colour and graphics etc,  but at the time of issue so advanced to have a four cylinder of that capacity.

Looking back at old bike magazines,  British and other manufacturers were always proposing production four cylinder engines. Honda just went ahead and built it almost as an aside to other bikes.

I do think the original four pipes on the 350 are one of the best looking of all those from that era though. Surprises me that they are not a more numerous model bike though. I'd choose one over the contemporary twins without hesitation.

Very nice bike.

Welcome to the forum.

Looks like you're well on the way with the bike already.

We just had someone on here emigrate to Australia,  so one in one out keeps the numbers tidy 

Thought this was a good looking race adaption of 400,  more practical than stylised with very neat details.

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https://www.kijiji.it/annunci/moto-e-scooter/como-annunci-erba/honda-cb-400-four-stile-samoto-roma-anno-1974/113033174

More details on the link above.

I understand it as kevski states.

The steel tank that has rust is already compromised,  or beginning to be, dependant on how much rust.

From a metallurgy point of view,  steel sheet has been rolled to get it's thickness to required dimension for component pressing.  This makes it effectively close to forged and maintains a compression of the surface that is a little resistant to corrosion because of its physical structure. It's this property that fuel tanks have taken advantage of for years,  so they've never really been treated during production.

If you've left a piece of sheet that's been cut in damp conditions,  the cut edges will very quickly corrode and general surface take much longer.

Once you cut, grind,  corrode etc you loose this refined surface compression,  making it far more likely to flash corrode as you further prepare it.

Welcome to the forum.

Nice machineshop there, I like the high speed hand drive on the rotary table