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CB750K1 Headlamp unit

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Chris400F:
Pretty sure this is an original unit, it looks as I remember them from back then with the light unit nearly filling the rim.
I can't be sure but 5.25" doesn't seem an obvious size of lamp to use for this type of conversion. It would need a wider adaptor ring and would have to have an offset locating tab in order to line up with the locating tabs on the headlamp rim.
That seems to be the difference between motorcycle and car units - the motorcycle ones have a locating tab fitted at the top instead of in various places around the unit.
You can still buy 5 3/4" car headlamp units but a suitable adaptor ring would need to be constructed if you were to try to fit one to improve light output, and of course you would then be even less original (although you would be able to see where you were going).
Another alternative could be that this guy (http://www.norbsa02.freeuk.com/goffybulbs.htm) has halogen bulbs in 35/35W, 50/50W and 60/55W ratings to replace the bulb in the standard headlamp (Bosch BA20d Bayonet Cap type). Might be a way of improving the light output.

mike the bike:
I'm thinking the superdream headlamp will fit a 400four and that has an H4, 55/60W bulb.  M & P have them for £31.  I'll get one and post my findings.

Chris400F:
I thought the Superdream had a 7" headlamp but M&P list both 6" and 7" versions for that bike.
From the price you are obviously looking at the 6" one.
Keep us posted! Especially with regard to fitting (thinking particularly the mounting hardware).

mike the bike:
The headlamp arrived a few days ago and I've just got around to fitting it.  Firstly,  it's not exactly like the superdream ones;  the rim is 400F profile rather than 400N profile.  Having said that, the fixing tabs where the M5 screws fit into didn't line up with the holes in my original shell.  The tabs were too short in other words so I used the original rim.
The green, white and blue leads came without bullet connectors so I fitted new ones.  Not surprising really because 400N connectors are different anyway.
The side light 💡 is a wedge bulb, yellow so I put a white one in.

In summary,  it took a bit of fettling to get it to fit but I've now got an authentic looking 55/60W H4 headlamp and I consider it well worth the time and effort.
I'm now going to sell the original headlamp and the superdream shell and rim on ebay

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