Honda-SOHC

My 500 headlamp is  a standard UK style 7" unit.
It has the three lugs similar to those on the old sealed beam headlights.

I fitted a Land Rover Defender 90 type LED headlamp unit but pretty much any old style 7" headlamp will fit.

Iirc there is an O ring between that collar and the gears so heat would ruin that.

How to remove the output bearing.

Remove the gear next to to bearing, fit the shaft loosely in a vice so not to mark it and allow it to move and knock the bearing off the shaft so that it moves away from the collar, once it moves a little it will come off easily. Protect the end of the shaft when hitting it. Once off there is a really thin oring fitted between the bearing and the collar, on no account try to remove the collar unless it’s ruined. Do not under any circumstances insert anything between the bearing and the collar.

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I've just noticed the oil seal is not on the end of the camshaft, did it fall off when you took the rocker cover off?

Yes, that’s to one side for now

I would expect to see a bit more oil in the oil bath below the cams if the engine has been running for 3-4 minutes. Did the top end sound rattly when first started and did it quieten down after the oil began to circulate or did it sound the same? I am not really experienced with these engines but if one side of the head has more oil than the other I would be concerned the oil jet on one side is restricted and not delivering the correct amount of oil to that side.

The cam chain is picking up oil from the bottom of the engine as it goes around the crankshaft sprocket and it could be splashing oil at the top end as it comes back up to the camshaft. The oil filter is also in the bottom end where oil pressure is likely to be unrestricted.

It will be very messy but I’d be tempted to run the engine on the starter motor in short bursts with the rocker cover (and fuel tank) taken off and see if the oil is reaching the top end.