SOHC.co.uk Forums > CB750

CB750K1 Headlamp unit

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Chris400F:
As requested, a picture of the glass and a few more for good measure. Maybe someone can now confirm whether it is a Z Beam or not.
The lamp unit is 5 3/4". Units of this size are still available, but these have convex glass whereas the units sold for bikes had concave glass.
The adaptor ring is stepped so it wouldn't be as simple as making a template and cutting a ring to suit, although that may work.
The final pic shows the retaining clips - top is one that came with the Cibie unit, bottom is an original.

AshimotoK0:
I had one of those in the last pic on a 400/4 and it was absolutely superb compared with standard. Would fit one to any one of my bikes without hesitation and the one part I would fit and say b*llocks originality apart from tyres.

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).

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