I was hoping to find an alternative to the sealed beam options and find a headlamp lens/reflector housing that took replacement bulbs like H4's and the KZ750 but I'm not finding anything of this size. Has anyone successfully found an alternative? There was a company called Candlepower that had just what I was looking for but they no longer offer them...
I bought a replacement bucket and brackets from Dime City, as well as a, sealed-beam H4 conversion housing. The factory headlight bucket on the KZ440 only works with the KZ440-specific sealed-beam unit, which is Kawasaki P# 23003-022 . There are NOS units available on ebay.... for over $100.
That will accept any 7" universal fit sealed beam unit from the auto-parts store, or you can get an H4 conversion that will let you use H4 lamps.
You can see the pics of my headlight setup here:
Note that I also replaced my mounting bracket and the turn signals (My bike had aftermarket turn signals when I bought it, and they weren't very good). You might be able to re-use your factory bracket, but you would likely need to get the stock-style bucket that I linked above rather than the deeper British style one I have.