Retro this was taken from the SOHC4 forum .

On the '74 750 K4 the standard factory headlight bulb is 40/50 watts.

Some guys step up to a 50/60 watt bulbs........ there has always been an ongoing pros and cons debate about this. Some claim possible problems, others say they never have a problem. I suppose it depends how "clean", how good your electrical system is.........

~ ~ ~ jaknight ~ ~ ~